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Accessibility Information

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Physiology

Within Science

Still image from: Journey to the Microcosmos: The Illuminating Reason Perenema Curl Up Into a Ball

Still image from: Journey to the Microcosmos: The Microscopic Circle of Life

Still image from: Journey to the Microcosmos: The Moss Animals That Are Defined by Their Butts

Still image from: Journey to the Microcosmos: The Purple Bacteria That Are Afraid of Oxygen

Still image from: Journey to the Microcosmos: The Secret Things Living In Your Drains

Still image from: Journey to the Microcosmos: The Shared Doom of Microscopic Hitchhikers

Still image from: Journey to the Microcosmos: The Spatula-Shaped Ciliate Family

Still image from: Journey to the Microcosmos: The Tiny Crustacean With the Oldest Penis

Still image from: Journey to the Microcosmos: The Tiny Worlds Inside of Single-Celled Organisms

Still image from: Journey to the Microcosmos: These Algae Curl Up Into a Ball When They Get Stressed Out

Still image from: Journey to the Microcosmos: These Rotifers Glue Themselves Together

Still image from: Journey to the Microcosmos: This Ciliate Is About to Die

Still image from: Journey to the Microcosmos: Unsolved Mysteries of the Microcosmos

Still image from: Journey to the Microcosmos: Water Is Thicker When You’re Smaller

Still image from: Journey to the Microcosmos: Water Mites--Sticky Dancers With Crystal Poop

Still image from: Journey to the Microcosmos: We Finally Found the Elusive Bristle Worm!

Still image from: Journey to the Microcosmos: We Found a Super Rare Microbe!

Still image from: Journey to the Microcosmos: We Recorded Some Strange Goop. What Is It?

Still image from: Journey to the Microcosmos: We Recorded Too Much Slow Motion Footage

Still image from: Journey to the Microcosmos: We Upgraded Our Microscope... Again!

Still image from: Journey to the Microcosmos: What Even Is a Species?

Still image from: Journey to the Microcosmos: What Humans and Stentors Have in Common

Still image from: Journey to the Microcosmos: What If All the Microbes Disappeared?

Still image from: Journey to the Microcosmos: What Is Mold and Why Does It Love Bread?

Still image from: Journey to the Microcosmos: Where Is This Anemone Really From?

Still image from: Journey to the Microcosmos: Why Are These Single-Celled Organisms so Large?

Still image from: Journey to the Microcosmos: Why Do Bacteria Move Like Vibrating Chaos Snakes?

Still image from: Journey to the Microcosmos: Your Mouth Is a Cave For Microbes

Still image from: Journey to the Microcosmos: Your Screen Is Covered in Human Blood

Still image from: Lab Six: Hands--Part 2 (Spanish)

Still image from: Lab Six: Respiratory System (Spanish)

Still image from: Lab Six: Respiratory System II (Spanish)

Still image from: Lab Six: The Brain (Spanish)

Still image from: Lab Six: The Brain II (Spanish)

Still image from: Lab Six: The Hands (Spanish)

Still image from: Lab Six: The Human Body (Spanish)

Title card in blue box on white background reads, "How many syllables are in support?"

Cartoon of a child in a classroom setting standing at the front of the class next to a skeleton. Caption: Your body's made of many parts that help you move and think.

Still image from: Let's Talk About Sex: Body Basics (Video 1)

Still image from: Let's Talk About Sex: Puberty (Video 2)

Girl wearing an embroidered yellow dress holds an open book up to a teddy bear as she smiles down at it. Text reads, "Living and Nonliving Things for Kids."

Illustration of human torso with area over the upper chest in x-ray vision, showing the rib cage and heart. Caption: the heart.

Group of children with arms raised. Spanish captions.

Illustration of the human digestive system. Caption: Then the remains of the food, which is now pretty much waste,

Illustration of a human skull with the eyeballs still present. Caption: The human eye is an organ -- an exquisite sensory organ --

Illustration of tubular structures. Nova science Now. Caption: The answer -- mirror neurons,

Alex Dainis is seated in front of her book shelf. Animation of a cell structure. Caption: And this volume includes all of its organelles.

Three infrared images of a man, two running and one floating in the middle against a blue background. Text reads, "Muscles."

3D rendering of a neuron, resembling a ball of plant roots or a rhizome. Text reads, "Brain Basics."

Black-and-white illustration of a side-view X-ray of a human's head. The brain is composed of pink, green, and purple fiber-like masses forming separate structures. Text reads, "Mapping the Brain."

Person uses tweezers to hold up a tiny glowing computer part in front of their face which is visible in the blurred background. Text reads, Brains, Computers, and Technology.

Digital illustration of five stages of a brain's growth, from a small, smooth lump into a bigger shaped organ with bulges, grooves, and fissures. Text reads, "The Developing Brain."

Oval-shaped photo of a brightly lit city street full of people sitting at tables, standing, and in motion. Behind this, a black and white digital rendering of neurons and networks. Text reads, "The Thinking and Social Brain."

Illustration of the inner ear showing the stirrup bone and other structures. Caption: lie the fluid-filled cavities of the inner ear.

Slide shows white text on a green chalkboard against a brick wall that reads, "Turning Food into Energy."

Drawing of a human torso and head with a cross section of the chest removed to show the human heart and lungs. Caption: It has been seen as the site of our emotions,

Still image from: Overview: Are Roller Coasters Good for Your Brain?

A diagram depicts the musculature of lower back. Caption: Gluteus Maximus,

Illustration of a human arm flexing and the bicep muscle enlarged. Caption: to control the extent of the contraction,

Man and woman walking with arms around each other's waist. Caption: humans are truly a privileged species,

Four jets trailing colored exhaust engaging in trick maneuvers. Caption: (narrator) A g-force is the force gravity has on your body.

Kaleidoscopic pattern primarily in blues and greens. Caption: I worked more and more on generating these images.

Gloved hand holding the trachea and lungs from a human body. Caption: branches into two smaller tubes called bronchi,

Computer screen showing a cross section of the human brain. Caption: and it's a fundamentally new way to see the brain.

Brightly colored bird with a beak almost as large as its body. Caption: You'd think it would be too beak-heavy to fly.

Bat with wings extended spots on the rib of one wing highlighted. Caption: We're interested in bat flight mechanics and how they fly.

Person working on a robotic leg that is wearing a shoe. Caption: This is a battery that powers everything.

Woman in front of a computer screen in a dimly lit space. Caption: about impacts of night shift work on a woman's body clock.

Person with a fabric cap strapped to their head. The cap has metal rivets and wires attached. Captions: (female) it feels maybe like a mild itchy or tingling sensation.

Person sitting at a table across from a robot. On the table in front of them are objects of different shapes and colors. Caption: Would you put the green object with one peg into the red box?

A gray eel. National Aquarium. Caption: an electric eel can generate enough current to stun its prey.

Closeup view of very thin wires forming concentric squares and other geometric patterns. Caption: these circuits are thinner than a hair

Person placing an object under a microscope. Caption: for nerves to regrow themselves

Person holding a large animal skull. Caption: The teeth on this thing are huge.

Alligator in grass. Caption: for a population and genetics survey of alligators.

Cross section of the human brain. Caption: creating a virtual 3-D image of the brain.

Person walking on a treadmill with sensors attached to their legs. Caption: (narrator) What if you could alleviate pain by changing your stride?

Diagram of an orange sphere. Part of the shell of the sphere is removed to show the white interior. On the surface of the sphere are small, brightly colored spots. Caption: help protect against the toxins they make.

Two people standing at a counter checking in with a receptionist. Caption: So they joined a live donor kidney exchange program.

A snake with eyes covered. Caption: this snake strikes its prey with pinpoint precision.

A device strapped on a man's hand. Caption: That device strapped to his arm is a sweat biosensor.

Person with head laying on pillow while wearing a cap with wires attached. Caption: and how you can boost how much you remember while you snooze.

Red, black, and white snakes in a tube. People in white lab coats and gloves are in the background. Caption: They can go many places things with arms and legs can't.

Model of a human head being brushed by whiskers attached to wires protruding from a metal post. Caption: by a set of artificial wire whiskers,

Graphic of light and dark blue spheres of various sizes. Caption: The food molecules fuel cellular respiration.

Computerized image of a skull. Caption: The axial skeleton consists of the skull,

Negative feedback loop. Control center (brain), effector, response, feedback, stimuli, receptor, back to control center. Caption: The control center determines the appropriate response.

Closeup of a mottled brown spider. Caption: arachnids and crustaceans, have a skeleton on the outside

Two crabs facing off. Spanish captions.

Two people walking down a hallway. Caption: we chat with DNA scientist Bruce Jackson,

Still image from: SciShow Kids: Animal Slime and Other Weird Stuff

Still image from: SciShow Kids: Animal Tricksters

Still image from: SciShow Kids: Armadillos--Animals With Armor

Still image from: SciShow Kids: Camouflage--Animal Hide & Seek

Still image from: SciShow Kids: Fireflies--Nature's Baffling Blinkers

Still image from: SciShow Kids: How a Caterpillar Becomes a Butterfly

Still image from: SciShow Kids: How Do We See Color?

Still image from: SciShow Kids: Inspect an Insect

Still image from: SciShow Kids: Meet Your Tonsils

Still image from: SciShow Kids: Nails--Your Human Claws

Still image from: SciShow Kids: Plants With Weapons

Still image from: SciShow Kids: See Your Own Fingerprints

Still image from: SciShow Kids: Super Strong Dragonflies

Still image from: SciShow Kids: Teeth--Not Just for Smiles

Still image from: SciShow Kids: The Science of Being Scared

Still image from: SciShow Kids: What Are Boogers?

Still image from: SciShow Kids: What Happens If You Swallow Gum?

Still image from: SciShow Kids: Why Do Animals Have Tails?

Still image from: SciShow Kids: Why Do I Feel Sick in the Car?

Still image from: SciShow Kids: Why Do I Get Wrinkly Fingers in the Bath?

Still image from: SciShow Kids: Why Do I Have Freckles?

Still image from: SciShow Kids: Why Do Kangaroos Have Pouches?

Still image from: SciShow Kids: Why Do We Brush Our Teeth?

Still image from: SciShow Kids: Why Do We Dream?

Still image from: SciShow Kids: Why Do We Get Dizzy?

Still image from: SciShow Kids: Why Do We Get Goosebumps?

Still image from: SciShow Kids: Why Do We Get Hiccups?

Still image from: SciShow Kids: Why Do We Get Vaccines?

Still image from: SciShow Kids: Why Do We Have Belly Buttons?

Still image from: SciShow Kids: Why Do We Have Earwax?

Still image from: SciShow Kids: Why Do We Have Eyebrows?

Still image from: SciShow Kids: Why Do We Need Sleep?

Still image from: SciShow Kids: Why Do We Shiver?

Still image from: SciShow Kids: Why Does Hair Turn Gray?

Still image from: SciShow Kids: Why Does Spicy Food Taste Hot?

Still image from: SciShow Kids: Why Does Tickling Make Me Laugh?

Still image from: SciShow Kids: Why Don't Animals Need Sunscreen

Still image from: SciShow Kids: Why Is My Leg Asleep?

Still image from: SciShow: 3 Weird Things That Happen When You're Pregnant

Still image from: SciShow: Can Bright Light Make You Sneeze?

Still image from: SciShow: Can You Really Be Scared to Death

Still image from: SciShow: Pickles, Probiotics, and Why Rotten Food Is Good for You

Still image from: SciShow: The Agony of Motion Sickness

Still image from: SciShow: The Truth About Asparagus and Your Pee

Still image from: SciShow: What Happens if You Go Without Water

Still image from: Searching: Our Quest for Meaning in the Age of Science: Homo Techno

Illustration of a bear in snow. Caption: for the long winter's nap,

Closeup of the human eye. Caption: which regulates the amount of light entering the eye.

Closeup of a person's midsection. Person wears white and wraps their arms around themself. Title card reads, "Shedding light on heat, Episode 6. Heat and the human body."

Still image from: Short Takes With Naturalist Rudy Mancke: Alligator Skull

Still image from: Short Takes With Naturalist Rudy Mancke: Box Turtle Shell

Still image from: Short Takes With Naturalist Rudy Mancke: Cow Skull

Still image from: Short Takes With Naturalist Rudy Mancke: Mammoth Tooth

Still image from: Short Takes With Naturalist Rudy Mancke: Rattlesnake Rattle

Still image from: Short Takes With Naturalist Rudy Mancke: Red-Tailed Hawk Feather

Still image from: Short Takes With Naturalist Rudy Mancke: Shark Tooth

Still image from: Spot on Science: Catching Zzz's

Closeup of a slice of pumpkin pie with a dollop of whipped cream. A fork rests on the side of the pie plate.

A hummingbird drinking nectar out of a flower.

Still image from: Super Animals: Amazing Acrobats

Still image from: Super Animals: Funky Fliers

Still image from: Super Animals: Marvelous Minis

Still image from: Super Animals: Super Speedsters

Still image from: Super Animals: Super Stealth

Still image from: Super Animals: Super Strength

Still image from: Super Animals: Super Vision

Still image from: Super Animals: Team Players

Still image from: Super Animals: X-traordinarily Odd Animals

Still image from: Super Animals: X-Treme Adapters

Diagram of sound entering the ear and being processed by the structures in the ear. Spanish captions.

Children wearing dark sunglasses against a backdrop of the beach. Spanish captions.

Cartoon of a purple amoeba looking up at a spiraling double helix while a pink amoeba looks toward the viewer from the opposite side. Title card reads, "Alleles and Genes."

Cartoon of a purple amoeba looking up at a spiraling double helix while a pink amoeba looks toward the viewer from the opposite side. Title card reads, "Asexual and Sexual Reproduction."

Cartoon of pink and purple amoebas smiling and gesturing with their hands. Title card reads, "Biological Levels."

Cartoon of pink and purple amoebas smiling and gesturing with their hands. Title card reads, "Biomolecules."

Cartoon of 2 amoebas smiling and leaning in from opposite sides of the screen. Title card at center reads, "Blood Types and Punnett Squares." And in parentheses, "Multiple Alleles."

Cartoon of a purple amoeba holding a paintbrush and gesturing toward a chalkboard that reads, "Cell Transport." Pink amoeba smiles and gestures toward the chalkboard from the opposite side.

Cartoon of 2 amoebas smiling and leaning in from opposite sides of the screen. Title card at center reads, "Cellular Respiration."

Cartoon of 2 amoebas smiling and leaning in from opposite sides of the screen. Title card at center reads, "Chromosome Numbers During Cell Division."

Cartoon of a purple amoeba looking up at a spiraling double helix while a pink amoeba looks toward the viewer from the opposite side. Title card reads, "Chromosomes and Karyotypes."

Cartoon of a pink amoeba leaning to the side with its mouth open wide. Title card reads, "Codons."

Cartoon of a pink amoeba smiling and gesturing toward a title card that reads, "Dichotomous Keys with Scientific Names." Purple amoeba with surprised expression glances toward the title card from the opposite side.

Digital illustration of a double helix runs across the top and the bottom of the screen. Title card reads, "D, N, A Replication."

The molecular structure of D N A and R N A are depicted. Or The D N A double helix structure has two phosphate deoxyribose chains with the nucleotide bases are single bonded to it. The R N A single helix structure has a single phosphate deoxyribose chain with nucleotide bases attached to it.

Cartoon of a purple amoeba looking up at a spiraling double helix while a pink amoeba looks toward the viewer from the opposite side. Title card reads, "D, N, A, Chromosomes, Genes and Traits."

Purple cartoon amoeba holds a paintbrush and gestures toward a cartoon chalkboard that reads, "Enzymes." Pink cartoon amoeba smiles and gestures toward chalkboard on opposite side.

Cartoon of 2 amoebas smiling and leaning in from opposite sides of the screen. Title card at center reads, "Gene Regulation."

Cartoon of a purple amoeba looking up at a spiraling double helix while a pink amoeba looks toward the viewer from the opposite side. Title card reads, "Genetic Drift."

Digital illustration of the heads of 2 men labeled, "Godfrey Hardy" and "Wilhelm Weinberg." Title card at center reads, "Hardy-Weinberg Equilibrium. A population's allele and genotype frequencies are constant, unless there is some type of evolutionary force acting upon them."

Cartoon of a purple amoeba holding a paintbrush and gesturing toward a chalkboard that reads, "How Cells Specialize." And in parentheses below, "Featuring Stem Cells." Pink amoeba smiles and gestures toward chalkboard on opposite side.

Two cartoon characters. Human Body Systems.

Cartoon of a group of amoebas. 2 hold shields and point spears. 1 shouts toward another. A green amoeba aims a bow and arrow. Another holds a bottle opposite a shouting amoeba wearing goggles. Title card reads, "Immune System."

Cartoon of 2 amoebas smiling and leaning in from opposite sides of the screen. Title card at center reads, "Incomplete Dominance, Codominance, Polygenic Traits, and Epistasis."

Cartoon of a purple amoeba looking up at a spiraling double helix while a pink amoeba looks upwards at helix from the opposite side. Title card reads, "Inside the Cell Membrane."

Cartoon of a blue amoeba poking an irritated orange amoeba with an arrow that reads, "Intercellular to intracellular" that points to a frowning orange amoeba. Another blue amoeba stands next to an arrow that reads, "Intracellular to intercellular" and points to a blue amoeba poking an orange amoeba. Title card reads, "Signaling."

The Amoeba sisters present the heading, introduction to cells.

Cartoon of a purple amoeba looking up at a spiraling double helix while a pink amoeba looks toward the viewer from the opposite side. Title card reads, "Mitosis Versus Meiosis."

Cartoon of 2 amoebas smiling and gesturing opposite one another. Title card at center reads, "Mitosis."

A thought bubble for an amoeba sister reads, superpowers. Caption: Mutation.

Cartoon of a purple amoeba holding a paintbrush and gesturing toward a chalkboard that reads, "Pedigrees." Pink amoeba smiles and gestures toward the chalkboard from the opposite side.

Cartoon of 2 amoebas smiling and leaning in from opposite sides of the screen. Title card at center reads, "Plant Structure and Adaptation."

Cartoon of a frowning pink amoeba holding a folded piece of torn green paper. Large piece of folded green paper hovers to the side.

Cartoon of a purple amoeba looking up at a spiraling double helix while a pink amoeba looks toward the viewer from the opposite side. Title card reads, "Protein Synthesis."

Cartoon of 2 amoebas smiling and leaning in from opposite sides of the screen. Title card at center reads, "Sex-linked Traits."

Digital illustration of a sodium potassium pump with a brown cell wall and purple pump at the center. Title card reads, "Sodium Potassium Pump."

Split image of aerial view of city blocks next and a smiling person. Caption: It's the legacy of an evolutionary balancing act

A skeletal bone is being placed on a table.

Person holding a skeleton approximately the length of her thumb. Caption: …each of the limbs, and the scapula.

Closeup of an animal with a pointed snout, large claws, and overlapping scales covering its body. Caption: They are covered in keratin scales,