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open circulatory system
blood moves through cavities in the body. ex: insects. no veins or arteries less complex.
carries oxygen poor blood from the heart to the lungs, brings back oxygen rich blood to the heart
SA node (sino-atrial)
located in the righ atrium. is the pacemaker of the heart. It controls how fast the heart beats and is regulated by the body's needs (rest, exercise)
How does the SA node work?
it stimulates both atria to contract by sending electrical impulses to the AV node
1st number of blood pressure
systolic number (highest pressure in the artery when ventricles contract)
2nd number of blood pressure
diastolic (lowest recorded pressure in the artery when the ventricles contract during relaxation)
o2 and other nutrients are diffused into the cells while co2 and other nitrogenous waste goes into the blood (diffusion)
how platelets work
injury occurs -> platelets migrate to area-> they rupture and release clotting factors-> form clott-> clott contracts, pull
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