circulatory system Flashcards
what do blood vessels do
carry blood to and from the heart
what are arteries
carry blood away from the heart have very thick walls
what are the walls made of in arteries
outer connective tissue, then elastic and smooth muscle and then a endoclium lining
what are arterioles
smaller arteries
what are capillaries
smallest blood vessels, where exchange occurs
what do capillaries characteristic
only one layer of endothelial cells and have sphincters
what are venules
small veins that take blood back to the heart
veins are
thin walled vessels and have values to prevent back flow and skeletal muscle to push blood
what does the heat look like
cone shaped and sits between the lungs and slightly left has 4 chambers
what are the four chambers of the heart
right atrium, left atrium and right and left ventricle
what is the myocardium
major part of the heart muscle
what is the endocardium
the inner surface of the chambers
what is the pericardium
fibrous tissue covering the heart
what is the av valves
a valve that sits between the atrium and ventricle to prevent back flow
what does av valve mean
atrioventribular
