BIOLOGY (LL)
5th Edition
ISBN: 9781264115495
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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Cardiac action potentials have _________ duration than neuronal action potentials.
A. a shorter
B. the same
C. a longer
During the systolic phase of the cardiac cycle, the heart is ________. a. contracting b. relaxing c. contracting and relaxing d. filling with blood
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 down
Chapter 53 Solutions
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- parasympathetic nerve stimulation in the heartt will result in A.decreased heart rate B.increased vescular resistence . C. decrease venous tone D. both a and barrow_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
- The ___________ receive blood from the body via veins. A. both atria and ventricles B. atria C. ventriclesarrow_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
- Medication 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_forwardContractions in the heart are controlled via a well-regulated electrical signaling cascade that originates in pacemaker cells in the _______ node and is passed via internodal atrial pathways to the ________, the __________, the___, and to all parts of the _________. A. sinoatrial node B. ventricle C. Purkinje system D. Bundle of His E. atrioventricular nodearrow_forwardThe 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_forward
- Changes in the cardiac rate primarily reflect changes in the duration of a. systole. b. diastole.arrow_forwardThe force the heart must overcome to pump blood isknown as ________.a. preloadb. afterloadc. cardiac outputd. stroke volumearrow_forwardA patient has been in a serious car accident and is hemorrhaging. Which of the following changes would be seen in this patient? a. a decrease in stroke volume b. an increase in heart rate c. a possible decrease in cardiac output d. All of these are correct.arrow_forward
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