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A stomach ulcer is caused by an imbalance between acid and pepsin secretion and the defenses of the stomach mucosal lining. Ulcers can be treated through dietary changes and medication.

After the animation loads, click and drag the model to rotate it in any direction. Select a term from the structure list to travel to its location.

The skeletal muscles are under voluntary (conscious) control most of the time. However, skeletal muscle movement can also by induced by involuntary reflexes...more...

In Parkinson's disease, dopamine production becomes irregular and inadequate and nerve cells cannot properly transmit messages...more...

The most critical stage of development for the embryo&8217;s nervous system is the third and fourth weeks of pregnancy...more..

The nervous system is composed of two divisions, the central nervous system (CNS) and peripheral nervous system (PNS)...more...

Pain provides the body with a protective mechanism, alerting it to potential or actual damage to the body&8217;s tissues

In a severe impact to the head, the brain moves and hits the skull causing injury. During a boxing match, the brain moves from side to side after the impact of a punch...

After the animation loads, click and drag the model to rotate it in any direction. Select a term from the structure list to travel to its location.

Air first enters the body through the mouth or nose, quickly moves to the pharynx (throat), passes through the larynx (voice box), enters the trachea, which branches into a left and right bronchus within the lungs..click for more...