human bio test 2
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