circulatory system- blood vessels Flashcards
arteries carry ____ pressure blood from heart to ______ in the body?
arteries carry high pressure blood from heart to organs in the body
arteries have thick muscular walls, what does this allow them to do?
allows them to withstand high pressure of blood
blood travels through arteries in _____ every time heart beats
blood travels through arteries in surges every time heart beats
what do elastic fibres in arteries do when surges of blood pass through to keep blood moving?
elastic fibres stretch when surges of blood pass through and recoil back in between surges
when blood passes through capillaries, substances such as ______ and _______ diffuse from blood into the cells?
when blood passes through capillaries, substances such as oxygen and glucose diffuse from blood into the cells
_________ diffuses from cells back into the blood?
carbon dioxide diffuses from cells back into the blood
how are capillaries specialised for diffusion?
capillaries have thin walls, so diffusion path is short
because a capillaries’ diffusion path is short, how does this affect the diffusion between blood and body cells?
allows substances to diffuse rapidly between blood and body cells
veins have a thin wall, why is this?
because blood pressure in veins is low, so wall does not have to be thick
veins contain valves, what is the function of valves?
valves ensure blood flows in right direction
which blood vessel is responsible for carrying blood away from heart, to the organs?
arteries
which blood vessel is responsible for exchanging of substances between body cells and blood, and connects arteries and veins together?
capillaries
which blood vessel carries blood from the organs back to the heart?
veins
