During a cardiac myocyte contraction, some of the Ca2+ necessary for contraction comes from the extracellular fluid. During relaxation, this Ca2+ will have to be extruded from the cell. Most of this Ca2+ is removed from the cell due to the activity of the:

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Home > Test Questions > physiology_test_question_DtjLDVyf4Hbjs5u6ZjWMcL7MP515Kwlg.html

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Physiology Test Question

During a cardiac myocyte contraction, some of the Ca²⁺ necessary for contraction comes from the extracellular fluid. During relaxation, this Ca²⁺ will have to be extruded from the cell. Most of this Ca²⁺ is removed from the cell due to the activity of the:

	(A) Plasma membrane Na⁺/Ca²⁺ exchanger
	(B) Plasma membrane Ca²⁺ ATPase

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Posted: Monday, December 29, 2014