Final answer:
D. left ventricle The left ventricle experiences the highest pressure during contraction, reaching around 118 mm Hg as it pumps blood into the systemic circuit.
Step-by-step explanation:
The chamber that experiences a maximum pressure of around 118 mm Hg during contraction is the left ventricle. The left ventricle is the major pumping chamber for the systemic circuit, which is responsible for ejecting blood into the aorta through the aortic semilunar valve. During the ventricular ejection phase of the cardiac cycle, the contraction of the ventricular muscle raises the pressure within the left ventricle to a level that is greater than the pressures in the pulmonary trunk and the aorta. It is this high pressure that allows the left ventricle to pump blood throughout the entire body, overcoming the high pressure already present in the systemic arteries
The left ventricle experiences a maximum pressure of around 118 mm Hg during contraction.
When the left ventricle contracts, it pumps oxygenated blood into the aorta, which then distributes the blood to the entire body. This requires a high pressure to ensure that the blood reaches all the organs and tissues. The force exerted by the left ventricle to generate this pressure is directly responsible for pushing the blood out of the heart and into the systemic circuit.
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