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Investigating Human Biology: The Circulatory System

Related Article: Learn more about the circulatory system.

The anatomy of the circulatory system is extraordinarily complex. Watch this video to learn more about the cardiovascular system.
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Disease Defense: The Immune System

Disease Defense: The Immune System (3:57)

The immune system contains white blood cells, which help destroy pathogens. Lymphocytes manufacture antibodies that help destroy pathogens.

Understanding the Brain: Development

Understanding the Brain: Development (0:57)

A baby's environment plays just as large a role in its development as its genes. Watch a video brought to you by the Discovery Channel.

Our Brain: The Brain Stem

Our Brain: The Brain Stem (0:47)

The brain stem is a bulge at the top of the spinal cord and contains the medulla that controls our breathing and heart rate.

10 Ways to Meet a Monster: Brain Transplants

10 Ways to Meet a Monster: Brain Transplants (2:59)

Is brain transplantation simply a science fiction creation? On The Science Channel's "10 Ways to Meet a Monster," watch as Dr. Robert White explains how he performed the first monkey brain transplant operation.

The Cell: Muscle Cells

The Cell: Muscle Cells (0:49)

Muscle cells contain long, thin myofibrils. Myofibrils are made up of actin and myosin. These proteins enable muscles to contract or expand.

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10 Ways to Meet a Monster: Brain Transplants

10 Ways to Meet a Monster: Brain Transplants (2:59)

Is brain transplantation simply a science fiction creation? On The Science Channel's "10 Ways to Meet a Monster," watch as Dr. Robert White explains how he performed the first monkey brain transplant operation.

Exploring Time: Heart Beat

Exploring Time: Heart Beat (1:57)

The heart must always keep a steady beat. Learn about the heart and how it functions on The Science Channel's "Exploring Time."

Exploring Time: Virtual Heart

Exploring Time: Virtual Heart (2:40)

See this mathematical model of the heart which responds to whatever is thrown its way. Learn more on this virtual heart on The Science Channel's "Exploring Time."

100 Greatest Discoveries: Blood Transfusion

100 Greatest Discoveries: Blood Transfusion (2:03)

Austrian physician Karl Landsteiner discovered that not all human blood is the same, and that there are four different blood types. Learn more about the beginnings of blood transfusion on the Science Channel's "100 Greatest Discoveries."

Kapow Superhero Science: Limb Regeneration

Kapow Superhero Science: Limb Regeneration (2:17)

Salamanders are able to grow new limbs. Learn more about the possibilities of humans re-growing limbs on The Science Channel's "Kapow! Superhero Science."

100 Greatest Discoveries: Blood Flow Theory

100 Greatest Discoveries: Blood Flow Theory (2:43)

English physician William Harvey's studies on blood flow were breakthroughs in understanding the human heart and the circulatory system. Learn more about blood flow on the Science Channel's "100 Greatest Discoveries."

Exploring Time: The Brain's Basal Ganglia

Exploring Time: The Brain's Basal Ganglia (2:35)

On The Science Channel's "Exploring Time," learn about the basal ganglia, a group of nuclei in the brain that controls all the other parts of the brain and regulates motor control, cognition, emotions and learning.

The Cycle Series: Getting Oxygen

The Cycle Series: Getting Oxygen (1:26)

Different organisms get the oxygen they need for cellular respiration in different ways.

Body and Brain: The Extremes

Body and Brain: The Extremes (24:38)

Scientists have made exciting breakthroughs related to the brain. In this program, learn more about these discoveries and see how one artistic savant is helping scientists gain insight into savant syndrome and the inner workings of the human brain.

Managing Your Health: The Digestive System

Managing Your Health: The Digestive System (24:40)

Why in the world does your body need 24 feet of intestines? Discover the answer in this program as you tour the digestive tract and learn how the esophagus, stomach, and small and large intestines work.