There are three major types of hormones. 1) Protein hormones (or polypeptide hormones) are made of chains of amino acids. An example is ADH (antidiuretic hormone) which decreases blood pressure. 2) Steroid hormones are derived from...

Pneumonia is a medical condition where lung tissue becomes inflamed, usually caused by a virus or bacteria. Learn how shortness of breath, cough, and fever are common symptoms of this condition and why they occur in pneumonia.

The pulmonary system including the lungs, larynx, trachea, bronchi, bronchioles, alveoli and thoracic diaphragm.

Overview of how the nephrons in the kidney filter blood and reabsorb water and other molecules.

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...

Explore how plastic reproductions of the human body can be used in education and for medical research. Discover how medical modelers and illustrators create models of the human body.

An animated video exploring the human anatomy. Video investigates the complexities of the human body. [1:30]

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

This lesson will introduce the female reproductive system as well as give an overview of the organs and glands associated with the female reproductive system. It is 2 of 5 in the series titled "Female Reproductive System."