Cell wall won’t be found in a animal cell since it’s only there in a plant cell.
That would be the nucleus.
The nucleus is the control center of the cell, located in the center of a cell.
<span>It has the advantage that only when the substrate is presence the genes responsible for its metabolism are turned on.</span>
<span>The correct answer is B. Pulmonary. The answers C. Cerebral and D. Extremity, are baseless regarding this question; A. Systemic could be a good alternative, as the blood flows from the systemic to the pulmonary circulation in the right side of the heart; but the systemic circulation is in fact mostly handled in the left side of the heart, while the right side handles the pulmonary one. </span>