The left ventricle pumps blood to the
a) right ventricle.
b) right atrium.
c) pulmonary circuit.
d) aorta.
e) lungs.

The correct answer is D.

Explanation:

During cardiac cycle, when the left ventricle is full, mitral valve closes to prevent blood to flow backwards into the atrium while the ventricle contracts. This is the end of diastole and the beginning of systole.

The left ventricle contracts and blood flows through aortic valve into the aorta and to de body. The closure of aortic valve establishes systole end.

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between the two muscle layers is the myenteric or auerbach's plexus, which controls peristalsis. in the colon, the muscularis externa is much thicker because the feces are large and heavy, requiring more force to push along. the stomach has a third layer of muscularis externa: the inner oblique layer.