Multiple choice

The heart is the pump of the human circulatory system. Which among the following does not characterise the circulation of blood by human heart?

  1. The majority of vasculature in the body constricts to norepinephrine.

  2. The papillary muscles are attached with the mitral valve.

  3. If the posterior descending artery is supplied by the circumflex artery (CX), then the coronary circulation is termed as left-dominant.

  4. During the ventricular systole, the subendocardial coronary vessels are compressed due to the high intra-artirial pressures.

  5. The heart regulates the amount of vasodilation or vasoconstriction of the coronary arteries.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

During contraction of the ventricular myocardium (systole), the subendocardial coronary vessels (the vessels that enter the myocardium) are compressed due to the high intraventricular pressures.

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