« previous next »
« previous next »
 

Did you know?

Asthma attacks and symptoms usually get started by specific triggers (such as viruses, allergies, gases, and air particles). You should talk to your doctor about these triggers and find ways to avoid or get rid of them.

Did you know?

To combat osteoporosis, changes in lifestyle and diet are recommended. At-risk patients should include 1,200 to 1,500 mg of calcium daily either via dietary means or with supplements.

Did you know?

The familiar sounds of your heart are made by the heart's valves as they open and close.

Did you know?

Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.

Did you know?

Your heart beats over 36 million times a year.

Endocrine System Endocrine System
The central nervous system The central nervous system
Trans-Alaska Pipeline System (TAPS) Crosses the Active Strike-Slip Denali Fault Trans-Alaska Pipeline System (TAPS) Crosses the Active Strike-Slip Denali Fault
A hole in the exhaust system can cause outside air (containing oxygen) to be drawn into the exhaust ... A hole in the exhaust system can cause outside air (containing oxygen) to be drawn into the exhaust ...
The urinary system. The urinary system.
Sympathetic Nervous System's Flight or Fight Response Sympathetic Nervous System's Flight or Fight Response
Video: Secondary and tertiary levels of protein structure Animation

For a complete list of videos, visit our video library