unit 3 lesson 8-10 quiz Flashcards
what do arteries do
- blood away from the heart
- most bring oxygen rich blood
what is the exception for bring oxygen rich blood in arteries
pulmonary artery
what are arterioles
arteries branch to smaller vessels
what do capillaries do
- exchange material between blood and body tissue
- oxygen and carbon dioxide diffusion
what are capillaries
the smallest blood vessel
what are venules
capillaries branch into them, they are smaller than veins
what do veins do
carry blood back to the heart (low pressure)
what are valves
a few centimeters along a vein allow blood to flow in one direction toward the heart
what is muscle action
skeletal muscle activity in surrounding muscle that helps squeeze the veins
what is breathing action
creates a negative pressure in the chest and sucks blood up into the heart
what are the three functions of the circulatory system
- transport of nutrients, gases, hormones and wastes
- temperature regulation
- immunity
what is an open circulatory system
blood flows freely in the body cavity
what is a closed circulatory system
circulating blood is contained within vessels
what is blood made up of
- 55% plasma
- 45% blood vessels
how much of plasma in water
92% water
