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membrane that surronds the heart-> secrets fluid and decreases frcition


what carries blood away from the heart, thick walled


small arteries


small vessels where blood cells move single file-> good for gas exchange


return blood to heart, small veins that drain blood from the capillaries and then join to form a vein


larger vessels whith valves that bring blood to the heart


the part of the cardiac cycle where the ventricles are filled


when the blood moves out of the heart as the ventricles squeeze


the relaxation period before the heart refills

sinoatrial node

the hearts pacemaker

varicose veins

valves in legs leak and veins bulge

myocardial infarction

fancy name for heart attack


sinoatrial node loses control of the heartbeat


increased blood pressure weakens the wall of an artery and can burst

transports materials, defends against pathogens, regulates temperature, regulates pH

main functions of blood


the liquid part of blood, formed from water, proteins, wastes and metabolites

formed elements

solid part of blood

red blood cells

live about 4 months, never replicate, concave (which allows them to stack, increases flexibility, and increases surface area)

function of RBC

carry oxygen and pick up CO2


what oxygen attaches to in the blood (what CO2 binds to faster than oxygen)

white blood cells

kill pathogens, about 1-2 for every 1000 of their counterpart


clotting proteins-> sticky barrier at site of an injury

Hemolytic Disease of the Newborn

the resulting disease when a mother is Rh- and her baby is Rh+


a lack of RBCs which means a lack of O2->makes you tierd


a clot that travels to the lungs


a clot that forms deep in a vein


lack of a clotting factor-> a genetic, sex-linked, recessive trait


cancer of the WBCs-> cells travel out of the bone marrow and attack healthy cells


the oercentage of blood that is composed of RBC->usually around 45

systolic pressure

the increase of pressure as the heart contracts and sends a surge of blood throughout the body

diastolic pressure

the decrease of pressure when the heart relaxes between beats

brachial artery

main artery that carries blood to the arm.

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