Which of the following describes how the septum in the heart affects blood flow? a.) it pumps blood out of the heart to the rest of the cardiovascular system when heart muscles contract. b.)it separates the heart's left and right sides to keep oxygenated and deoxygenated blood from mixing. c.)it separates the heart's upper and lower chambers to keep incoming and outgoing blood from mixing. d.) it accepts blood into the heart from the rest of the cardiovascular system when heart muscles relax.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;

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