Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 53, Problem 9TY
Summary Introduction
Introduction:
The regulation of homeostasis related to the circulation of blood is maintained by an integrated system. It comprises organs and receptors. The baroreceptors are present in the major blood vessels such as aorta and carotid artery.
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- Which is not true about early after depolarizations in ventricular cardiac muscle? A. Excitatory currents re-activate and interact with other currents which can cause EADs. B. EADs are sustained by re-entrant refractoiness. C. EADs are often associated with Long QT syndrome. D. Premature reactivation of excitatory current currents during repolarization is a cause of EADs. E. Adverse drug reactions resulting in diminished potassium currents relative to calcium currents are associated with EADs.arrow_forwardWhy is it necessary to stimulate papillary muscles in the ventricle slightly earlier than the rest of the ventricular wall myocardium? a. to assure rapid conduction speed of the action potential b. to pull on AV valve cusps to prevent backflow c. to assure blood will surge toward the semilunar valves d. to assure coordinated contraction of the ventricular myocardiumarrow_forwardComplete ventricular filling occurs during what phase of the cardiac cycle? a. when the atria are in diastole b. when the ventricles are in diastole c. when the ventricles are in systolearrow_forward
- What is the primary reason for why pulse pressure increases with aging? a. Decrease in the number of capillaries b. Aortic compliance decreases c. Speed of blood ejection from the aorta decreases d. Stroke volume decreases e. Heart rate decreasesarrow_forwardSA node is the main pacemaker of the heart. Why is the normal heart rate lower than the intrinsic firing rate of the SA node? A. sympathetic inputs from the hypothalamus are slowing it down B. parasympathetic inputs from medulla oblongata are slowing it down C. there is inertia in heart muscle as it takes time for impulse to spread through all the cells D. centrifugal inputs from the AV node are slowing it downarrow_forwardWhich of these is an incorrect statement concerning the heartbeat?a. The atria contract at the same time.b. The ventricles relax at the same time.c. The atrioventricular valves open at the same time.d. The semilunar valves open at the same time.arrow_forward
- What is the correct order of events in the left ventricle during the systole phase of the cardiac cycle? a. Ventricular repolarization, ventricular relaxation, 2nd heart sound, AV valve opens, blood moves in b. QRS-complex, ventricular contraction, 2nd heart sound, aortic valve opens, blood moves out c. P-wave, increased ventricular pressure, 1st heart sound, aortic valve opens, blood moves in d. QRS complex, ventricular contraction, 1st heart sound, AV valve opens, blood moves out e. QRS complex, increased ventricular pressure, AV-valve closes, blood moves outarrow_forwardIn terms of being open or closed, what is the state of the mitral and tricuspid valve (left and right atrioventricular valves respectively) at the end of the first heart sound? a. Mitral is closed, Tricuspid is open b. Mitral is open, Tricuspid is closed c. Both are closed d. Both are openarrow_forwardWhy might the increase in heart rate associated with a vigorous exercise program be the cause of his becoming unconscious? a. increase in blood pressure throughout the body b. failure of the conduction system c. increase in return volume of blood to the heart d. coronary blood flow reduction due to tachycardiaarrow_forward
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