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function of red blood cells

carries oxygen from our lungs to the rest of our bodies

function of white blood cells

helps the body right infection & other diseases

function of platelets

to prevent and stop bleeding

function of plasma

takes nutrients, hormones and proteins to the parts of the body that needs them

explain inhalation

-breathe in, lungs inflate -up & out movement of ribs -increased volume of the pleural cavity -diaphragm pulled down

explain exhaltion

-breath out, lungs deflate -down & in the movement of ribs -decreased volume of the pleural cavity -diaphragm pulled up

how does oxygen enter our blood from the lungs?

the oxygen is inhaled, air passes across the lining of the air sacs and into the blood vessels

how does carbon dioxide get to the lungs from the blood

through the capillary wall

where does the blood that leaves the right ventricle go?

to the lungs

where does the blood that leaves the left ventricle go?

aorta

why are the walls of the artery thick?

blood pressure is high so they have to be thick to maintain blood pressure & control blood flow

what prevents backflow in the heart and veins

a series of valves open and close tightly

left side of heart is..

oxygenated

right side of the heart is...

deoxygenated

arteries

-carries blood away from the heart -thick-walled to cope with pressure caused by heart -carries oxygenated blood

veins

-carries blood towards your heart -thin-walled because they don't have to deal with pressure -carries oxygenated blood.

capillaries

-transports blood, nutrients and oxygen to cells in your organs & body -thin layer of cell wall to help gas exchange between blood and tissue cells -caries both de/oxygenated blood

why is the heart a double pump

carries oxygen-poor to the heart then delivers oxygen-rich back to the heart