NEET Biology question
Which of the following statement(s) regarding the cardiac system is/are correct? (i) Human heart is an ectodermal derivative. (ii) Mitral valve guards the opening between the right atrium and left ventricle. (iii) SAN is located on the left upper corner of the right atrium. (iv) Stroke volume × Heart rate = Cardiac output.
Answer: (D)
Solution
The heart develops from mesoderm (not ectoderm), so (i) is false; the mitral valve guards the left atrium-left ventricle opening, not right atrium-left ventricle, so (ii) is false; the SAN lies near the opening
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