open circulatory system
blood moves through cavities in the body. ex: insects. no veins or arteries less complex.
closed circulatory system
blood moves through veins and arteries. ex: humans
ex 2 chambered heart
ex 3 chambered heart
ex 4 chambered heart
reptiles, birds, mammals
flaps that prevent blood from flowing backwards
a valve between right atrium and right ventricle
beween righ ventricle and pulmonary artery
between left ventricle and left atrium
between left ventricle and aorta
carries oxygen poor blood from the heart to the lungs, brings back oxygen rich blood to the heart
carries oxygen rich blood to the body and brings back oxygen poor blood
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
AV node (atrial ventricular)
transmits the electrical impulse from the SA node
Blood Pressure units
average blood pressure
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)
all deoxegenated vessels except for pulmonary vein
all oxegenated vessels except for the superior and inferior vena cavas
o2 and other nutrients are diffused into the cells while co2 and other nitrogenous waste goes into the blood (diffusion)
Blood is ________ type of tissue
55% plasma, 45% red blood cells
90% water, 10% proteins (dissolved salts WBC, and proteins)
Red blood cells
ertythrocytes, carry oxygen take away co2
clotting protein, made in bone marrow
how platelets work
injury occurs -> platelets migrate to area-> they rupture and release clotting factors-> form clott-> clott contracts, pull
fibrin, WBC, platelets, RBC
body does not have enough healthy red blood cells
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