cardiac muscles are myogenic – what does this mean?
A. muscles contract and relax by receiving signals from the nervous system
B. they have a particular genetic mutation
C. muscles contract and relax without receiving signals from the nervous system
D. the muscle cells wall are made of myelin
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Which is the best definition of blood pressure?
A. The force exerted by blood against the blood vessel wall.
B. the pressure in the arteries when the ventricles are contracting
C. the pressure in the arteries when the ventricles are relaxing
D. the distance the blood is from the heart
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