Physiology Quiz - Cardiovascular Physiology - Part 1
The cardiovascular system is composed of the heart and blood vessels. The basic function of the heart is to pump blood through the blood vessels. The basic function of the blood vessels is to serve as conduits to carry blood away from the heart to the tissues, and to return blood from the tissues back to heart. Test your basic knowledge of cardiovascular physiology by taking this simple quiz.
(1) The spike phase of the action potential of the sinoatrial node pacemaker cells of the heart is caused by:
(2) Choose the correct sequence of action potential conduction along the conductive tissues of the heart:
(3) In cardiac muscle cells, approximately what percentage of cytoplasmic Ca2+ required for contraction is released from the sarcoplasmic reticulum?
(4) In cardiac muscle cells, approximately what percentage of cytoplasmic Ca2+ required for contraction enters the cardiac muscle cell from the extracellular fluid?
(5) These cells are known as the primary pacemakers of the heart: