Homeostasis Flashcards
What is homeostasis?
Homeostasis is the maintenance of a constant internal environment.
What are the five components in a negative feedback control loop?
Norm, stimulus, receptor, corrective mechanism, feedback
What is the function of insulin?
It increases the permeability of the cell membrane to glucose and causes the liver and muscles to convert excess glucose to glycogen.
What is the function of glucagon?
It causes the conversion of stored glycogen back to glucose.
What is the function of ADH?
It increases the permeability of the walls of collecting ducts to water.
What is the effect of vasodilation?
When the skin arterioles dilate, more blood is sent to blood capillaries in your skin. As a result, more heat can be lost through the skin via radiation, convection and conduction.
What is the effect of vasoconstriction?
When the skin arterioles constrict, less blood is sent to blood capillaries in your skin. As a result, less heat can be lost through the skin.
How does the sweat glands assist in heat loss?
The sweat glands will become more active, resulting in increased production of sweat. As more water in the sweat evaporate from the surface of the skin, more latent heat of vaporisation is lost from the body.
How does shivering help increase body temperature?
Shivering is a spasmodic reflex contraction of the skeletal muscles, which increases the amount of heat released and helps to raise the body temperature back to normal.
