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pericardium

protective sac of tissue that surrounds the heart

the central organ of the cardiovascular system

the heart

myocardium

thick layer of muscle in heart

septum

separates the heart vertically into 2 sides

atrium

upper chamber that receives blood; pumps to ventricle

ventricle

lower chamber that receives blood from atrium; pumps blood out of heart

valves

flaps of tissue that control the flow of fluid

tricuspid valve location

right side of heart

bicuspid (mitral) valve location

left side

function of semilunar valves

prevent back flow of blood into ventricles

back flow against AV valves creates the...

"lub" sound

back flow against the SL valves creates the...

"dup" sound

heart murmur

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

arteries

only artery that carries oxygen poor blood

pulmonary artery

smallest blood vessel
vessel all diffusion takes place
slowest moving blood

capillary

blood pressure

the force created by the heart pumping blood through vessels

pulse

rhythmic stretching of arteries

ventricle contraction increases pressure

systolic pressure

relaxation of the heart

diastole (diastolic pressure)

hypertension

high blood pressure

plasma

sticky, straw- colored fluid (90% water), includes metabolites, nutrients, gases, hormones, wastes, salts, and proteins

only liquid tissue

blood

site of gas exchange in lungs

alveoli

walls of alveoli

one cell thick

the pulmonary circuit

carries blood between the heart and gas-exchange tissues

coronary circulation

systemic circulation that supplies blood to the heart itself

systemic circulation

carries blood to the heart and rest of the body

lowest pressured vessel

vein

vessel with greatest cross section (slowest)

capillaries

diameter of arteries are controlled by...

hormones

pressure and velocity are highest in which vessel?

aorta and arteries

capillaries are made of...

epithelial cells

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