Science Heart
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____ carries deoxygenated blood from body parts towards the heart
veins
Arteries 2 facts.
• vessels that carry blood away from the heart 2. have thick layer of smooth muscle to withstand pressure from heart beat.
gases exchange happens between the ______ and alveoli of lungs
capillary bed
erythrocytes (red blood cells) contains protein hemoglobin which
carries oxygen from the lungs to body’s tissues and helps return carbon dioxide from the tissues back to the lungs
leukocytes (white blood cells)
immune response and defend the body against diseases
platelets
responsible for clotting mechanism
veins and arteries connect to tissue by
capillaries which have thin walls
lymphocytes help
seek out pathogens in fluid and make antibodies which target pathogens so other cells can destroy them
conduction system or internal control
ensures that the heart chambers contract in a coordinated way
heart beat starts in
sinoatrial node aka pacemaker. upper wall of right atrium
contraction of atria followed by the ventricles is called
systole
rest phase when chambers relax and refill
diastole
atherosclerosis is
build up of plaque in blood vessels that reduces the flow of blood through the vessel
embolus
when plaque or clotted blood traveling through vessels creates blockage