BIOLOGY-TEXT
5th Edition
ISBN: 9781260169621
Author: BROOKER
Publisher: MCG
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Chapter 53, Problem 4TY
Summary Introduction
Introduction: Special pressure sensitive regions regulate the blood pressure of vertebrates. These regions contain the nerve ending of neuron and are present on the wall of some large arteries in mammals. These regions are known as baroreceptors.
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- SA 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_forwardParasympathetic stimulation of the sinoatrial node ______. A is necessary; without it the heart would stop beating B lowers the heart rate C increases the heart rate D does not occur; the heart receives no neural stimulationarrow_forwardAnytime there is a sustained change in blood pressure (longer than 2-5 minutes) ______ is responsible for sensing this change and restoring normal blood pressure. a. Carotid sinus baroreceptors b. Both the aortic arch and carotid sinus baroreceptors c. Renal baroreceptors d. Aortic arch baroreceptorsarrow_forward
- If heart rate is the independent variable and diastolic blood pressure is the dependent variable, which graph would best describe their relationship? Please thoroughly explain the effect on the dependent variable if the independent variable increases so I can fully understand the concept.arrow_forwardIf the sinoatrial node stopped generating action potentials the heart would _____. A stop beating because the sinoatrial node is the heart's pacemaker B beat with a slower frequency due to the spontaneous depolarization of the AV node C go into fibrillation immediately because the heart cells would no longer function in a coordinated rhythm D continue to beat normally because the sympathetic neurons going to the cardiomyocytes would initiate the depolarizationarrow_forwardIn electrocardiography (=EKG, =ECG), what causes a P wave?______ A. atrial repolarization B. ventricular repolarization C. atrial depolarization D. ventricular depolarizationarrow_forward
- The ___________ receive blood from the body via veins. A. both atria and ventricles B. atria C. ventriclesarrow_forwardwhich of the following factors will increase the cardiac output? a. decreased heart rateb. increased stroke volumec. increased end-systolic volume d. decreased sympathetic activitye. decreased venous returnarrow_forwardMedication to treat congestive heart failure include all except A. Angiotensin converting enzyme inhibitors B. Vasoconstrictors C. Beta blockers and calcium channel blockers D. Massive fluids Choose the correct answerarrow_forward
- The function of the right and left bundle branches is to _____. A rapidly transmit action potentials along the interventricular septum B contract forcefully to eject blood from the ventricle C spontaneously depolarize to start a second action potential in the ventricles D delay action potentials so that the atria have time to contact before the ventriclesarrow_forwardNeed helparrow_forwardThe force the heart must overcome to pump blood isknown as ________.a. preloadb. afterloadc. cardiac outputd. stroke volumearrow_forward
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