protective sac of tissue that surrounds the heart
the central organ of the cardiovascular system
thick layer of muscle in heart
separates the heart vertically into 2 sides
upper chamber that receives blood; pumps to ventricle
lower chamber that receives blood from atrium; pumps blood out of heart
flaps of tissue that control the flow of fluid
tricuspid valve location
right side of heart
bicuspid (mitral) valve location
function of semilunar valves
prevent back flow of blood into ventricles
back flow against AV valves creates the...
back flow against the SL valves creates the...
a defect in the valves of the heart allowing some back flow of blood
closed circulatory system
a circulatory system where blood is contained within the heart or blood vessels
carry blood away from the heart
only artery that carries oxygen poor blood
smallest blood vessel
vessel all diffusion takes place
slowest moving blood
the force created by the heart pumping blood through vessels
rhythmic stretching of arteries
ventricle contraction increases pressure
relaxation of the heart
diastole (diastolic pressure)
high blood pressure
sticky, straw- colored fluid (90% water), includes metabolites, nutrients, gases, hormones, wastes, salts, and proteins
site of gas exchange in lungs
walls of alveoli
one cell thick
the pulmonary circuit
carries blood between the heart and gas-exchange tissues
systemic circulation that supplies blood to the heart itself
carries blood to the heart and rest of the body
lowest pressured vessel
vessel with greatest cross section (slowest)
diameter of arteries are controlled by...
pressure and velocity are highest in which vessel?
aorta and arteries
capillaries are made of...
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