Bacteria are pesky little organisms that can often easily infect us. But how? Salmonella bacteria literally gets under our skin. Viewers see how the dangerous bacteria protects itself from defense mechanisms inside the cell.

Are you afraid of holes? Believe it or not, some people are! An interesting video explores the science behind trypophobia, or the fear of small holes. Viewers learn about the scientific difference between fear and disgust and identify...

What does the future hold for implantable devices? An informative video discusses the history of devices implanted in the human body starting with the first pace maker. After a discussion of the hurdles people must consider when...

Detailed virtual images of the human body broken down from general anatomy into the specific systems. An interactive opportunity allows for 3D views and overlapping sytems to understand how they work together.

In this feature, kids use chalk to trace the outline of their body, then add internal anatomy to their drawings from what they've learned in books they've checked out from their library. [1:34]

This lesson will examine the cause and effect of various disorders of the eye. It is 1 of 4 in the series titled "Disorders of the Eye."

This lesson will identify how a fetus develops during the second and third trimesters of pregnancy. It is 2 of 5 in the series titled "Fetal Development."

Learn why you walk in circles when blindfolded! This video explores the need to have a visible guide point to be able to walk in a straight line. [3:34]

Video created by Michael Chin for Mr. Hussey's 12th grade Biology class explains the complexities of the human nervous system with clarity. [9:58]

Hank takes us on a trip around the body - we follow the circulatory and respiratory systems as they deliver oxygen and remove carbon dioxide from cells, and help make it possible for our bodies to function. [11:40]

A video that discusses the 11 organ system of the human body. Learn some basic information about the circulatory, digestive, endocrine, excretory, integumentary, lymphatic, muscular, nervous, reproductive, respiratory, and skeleton...

Hank introduces us to the framework of our bodies, our skeleton, which apart from being the support and protection for all our fleshy parts, is involved in many other vital processes that help our bodies to function properly. [13:11]

Tropomyosin and troponin and their role in regulating muscle contraction. How calcium ion concentration dictates whether a muscle is contracting or not.

Learn about hemoglobin and its role in the circulatory system.

This video is a correction to sodium and potassium pump video showing that the main cause of the potential difference between the outside and inside of the membrane is due to fact that the membrane is highly permeable to potassium and...

This video discusses the reasons that the body produces "snot".

What is life? To try to answer that question, three tools stand out as being especially useful: A book, some experiments, and the microscope! In this video, trace the history of different theories about how our body works. [12:15]

This presentation highlights the eleven organ systems of the body, giving a brief overview of their functions. [9:24]

This Khan Academy resource, created by Jeff Otjen is a video that describes the condition allergic rhinitis.

Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-prep/mcat) for MCAT related content. These videos do not provide medical advice and are for...

Understanding the structure of a muscle cell.

Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-prep/mcat) for MCAT related content. These videos do not provide medical advice and are for...

The Khan Academy resource is a video about the effects of mutations.

This Khan Academy resource is a video about the process of urination.