Human Physiology with correct Question Answers 2024 final exam

Human Physiology with correct Question Answers 2024 final exam Myogenic Describes muscle tissue (heart muscle) that generates its own contractions. (action potentials) Ventricular myocyte action potential • Long lasting! >100ms • Has plateau phase due to presence of a large sustained Ca2+ current (ICaL) • Less chance of tetani! Lysosymes A membrane bound organelle that is responsible for degrading proteins and membranes in the cell, and also helps degrade materials ingested by the cell. Autolysis lysosymes release proteins which hydrolyse cell structures. Hydrolyse A chemical reaction involving breaking down a compound with water Haematoxylin A chemical used to stain the nucleus of eukaryotic cells. eosin Acid dye which stains deep pink Diastole Relaxation of the heart Systole Contraction of the heart End Diastolic Volume (EDV) volume of blood in each ventricle at end of ventricular diastole End Systolic Volume (ESV) volume of blood remaining in each ventricle after systole intrinsic regulation automatic response in a cell, tissue, or organ venous return The amount of blood returned to the heart by the veins cardiac output heart rate x stroke volume baroreceptor reflex produced by a group of mechanoreceptors that are found w/in walls of the heart. the reflex is activated when pressure rises w/in the large arteries above 60 mm Hg. peak in activity at approx 180 mm Hg. results in vasodilation secondary to inhibition of the vasomotor centers w/in the medulla as well as a decrease in heart rate and strength of contraction secondary to vagal stimulation vagus nerve the tenth cranial nerve that innervates digestive organs, heart an