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A change in the environment occurs. Through random mutations already present in the population (this is known as natural variation) certain individuals will be able to cope with the change more so than ot...

The nerve impulse starts at the dendrites, branch like structures,They then travel to the dendrons which make up the length of the neurone between the dendrites and the cell body.The cell body controls th...

When it is too cold the hypothalamus in the brain detects it is too cold it sends nerve impulses or electrical signals through the nervous system to targeted areas:erector muscles (don't laugh): are const...

first something must occur, a change in the external environment (and more rarely within the body). This is known as a stimulus.This stimulus will be picked up or "recepted" by a receptor.The re...

When you breath in, the intercostal muscles and diaphragm contract. This causes the diaphragm to flatten and the ribs to move apart which increases the size of the chest cavity. The larger volume now mean...