reflex arc

What is homeostasis?

Homeostasis is the maintenance of a constant internal environment.

What does homeostasis do?

Homeostasis maintains optimal conditions for enzyme action and all cell functions.

What does homeostasis need to control in the human body?

• blood glucose concentration
• body temperature
• water levels.
These automatic control systems may involve nervous responses or chemical responses.

What do the control systems include?

• receptors,
• coordination centres
• effectors

How does the nervous system work? (short)

stimulus > receptor > sensory neuron > coordinator (relay neurone) > motor neuron > effector > response

How fast are reflex actions?

Reflex actions are automatic and rapid; they do not involve the conscious part of the brain.