Tag - body


Heart attacks

A heart attack is when the blood flow going to the heart suddenly becomes blocked and the oxygenated blood can no longer reach the organ. Most heart attacks...


A sense of balance

The vestibular system functions to give you a sense of which way your head is pointing in relation to gravity. It enables you to discern whether your head is...


What makes us left-handed?

One side of the brain is typically dominant over the other. Since each hemisphere of the brain controls the opposite side (ie the left controls the right side...


Why are we ticklish?

Light touches, by feathers, spiders, insects or other humans, can stimulate fine nerve-endings in the skin which send impulses to the somatosensory cortex in...


Why do we sweat?

Sweat is produced by dedicated sweat glands, and is a mechanism used primarily by the body to reduce its internal temperature. There are two types of sweat...