The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Did you know?
The horizontal fraction bar was introduced by the Arabs.
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?
Everyone has one nostril that is larger than the other.
Did you know?
The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.
The lymphatic system. Lymphatic vessels, major lymph nodes, and lymphatic organs. The direction of l
Gastrointestinal system
Disorders and Diseases of the Endocrine System
Procedures for Diagnostic Tests Related to the Musculoskeletal system