« previous next »
« previous next »
 

Did you know?

People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

Did you know?

Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.

Did you know?

Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.

Did you know?

Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.

Did you know?

Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

Thyroid System Thyroid System
The sympathetic and parasympathetic divisions of the autonomic nervous system. The sympathetic and parasympathetic divisions of the autonomic nervous system.
A typical lubrication system, showing the oil pan, oil pump, oil filter, and oil passages. A typical lubrication system, showing the oil pan, oil pump, oil filter, and oil passages.
Lymphatic system vessels and the flow of lymph. Lymphatic system vessels and the flow of lymph.
United States Health Care System: Combining Business, Health, and Delivery United States Health Care System: Combining Business, Health, and Delivery
Muscular system Muscular system
Video: Double Stranded DNA Molecule Animation

For a complete list of videos, visit our video library