Closer to a mid-oceanic ridge, ocean crust tends to be:

Because of plate motion, Africa and South America are:

The continental shelf along the east coast of North America is part of a passive margin and consists of:

Seismic waves (vibrations) from earthquakes can generate unusual secondary effects including:

The pharyngeal phase of swallowing is a voluntary process that is controlled by the cerebral cortex.

Angiotensin II stimulates the adrenal cortex to release aldosterone.

ANP causes an increase in the loss of sodium and water through urine.

Long reflexes of digestion involve activity of the central nervous system.

A disease that involves both muscles and the skin is   

Changes in blood osmolarity that turn off the thirst center also increase the release of ADH from the pituitary gland.