blood vessels Flashcards
what causes the pulse
it is the changes in diameter of the vessel when blood flows through it
what controls the diameter of the arterioles
the lymphatic nervous system
what is vasoconstriction
to restrict blood flow
what is vasodilation
increase blood flow
how do blood cells move through the capillaries
in a single file because it is one cell thick
what do thin walls of capillaries do with nutrients moving through
facilitate diffusion
what happens when capillaries are damaged
the blood leaves the capillary and enter the interstitial spaces between cells
what do veins have that prevent back flow
veins have valves because it is under low pressure
how do the skeletal system help with transporting blood to the heart
they help by contracting and increasing pressure in veins
