which step occurs first in the vascular system?\no a. blood leaves the left side of the heart via the…

which step occurs first in the vascular system?\no a. blood leaves the left side of the heart via the aorta.\no b. blood leaves the right side of the heart via the pulmonary artery.\no c. blood either leaves the aorta and goes to the upper body and head, or travels to the lower body.\no d. blood loses carbon dioxide, picks up oxygen in the lungs, and then returns to the hearts left side via the pulmonary vein.

which step occurs first in the vascular system?\no a. blood leaves the left side of the heart via the aorta.\no b. blood leaves the right side of the heart via the pulmonary artery.\no c. blood either leaves the aorta and goes to the upper body and head, or travels to the lower body.\no d. blood loses carbon dioxide, picks up oxygen in the lungs, and then returns to the hearts left side via the pulmonary vein.

Answer

Brief Explanations:

The vascular system's cycle starts with de - oxygenated blood leaving the right side of the heart. The pulmonary artery is the vessel through which this blood exits. Option a is incorrect as blood leaves the left side of the heart (oxygenated) later in the systemic circulation. Option b is wrong because the aorta is not the vessel for blood leaving the right side of the heart. Option d describes a later step (gas exchange in the lungs).

Answer:

C. Blood leaves the right side of the heart via the pulmonary artery.