Question

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19) Why would increasing the workload on the heart lead to hypertrophy rather than hyperplasia of the myocardium? a) The vast majority of the functional cardiac muscle cells are labile cells. b) Hyperplasia is a type of adaptation in response to physiological stimuli while hypertrophy is always in response to pathological conditions. c) Contractile cardiac muscle cells are terminally differentiated cells, also called permanent cells that can no longer undergo mitosis. d) The vast majority of the contractile cardiac muscle cells are stable cells. 20) An infarct is an area of dead tissue caused by oxygen deprivation due to an obstruction in the local blood supply. What would you most likely expect to observe in a cardiac infarct? a) Necrotic areas b) Apoptotic cells c) Hypertrophied cells d) Atrophied cells bevodov

Answer 1

19) Hypertrophy means increase in size of the cells while hyperplasia means increase in the number of the cells.Cardiac muscles are terminally differentiated,so they cant divide and give rise to new cells.Hence they cant undergo hyperplasia, thus they undergo hypertrophy.

So answer is C.

20)In an infact,there will be dying and dead cells, I.e. necrotic areas.Apoptosis is programmed cell death, but in this case cells die by necrosis.

So answer is A.