Q.Write a brief note on the heart.
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Start your 14-day free trial to unlock the full solution →The heart is a four-chambered cardiac-muscle pump, alternating between systole (pumping) and diastole (filling), whose output is measured as stroke volume (per beat) and cardiac output (per minute).
The chapter describes the heart as divided into four parts — two pumping chambers (ventricles) and two receiving chambers (atria) — with the two sides separated by the septum, a thick muscular wall. It is made of cardiac muscle, which alternates between systole (contraction, when the ventricles pump blood out while the atria get ready to receive more) and diastole (relaxation, when the atria fill). The amount of blood pumped out of a ventricle in one contraction is the stroke volume; the amount pumped out in one full minute is the cardiac output — which rises, for e …
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