Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 53, Problem 6TY
Summary Introduction
Introduction: The volume of blood pumped by the heart in each beat is called stroke volume. Additionally, the volume of blood pumped by the heart per unit time is referred to as cardiac output.
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Students have asked these similar questions
In the measurement of cardiac function; all of the following are true except
A. Cardiac output is a measure of the amount of blood pumped by each ventricle in 1 minute
B. The heart rate is the number of contractions of the ventricles each minute.
C. The stroke volume is the amount of blood ejected from each ventricle with each contraction
D. The cardiac output will exceed 5 liters with an increase in HR in all cases
Choose the correct answer
Decreasing blood pressure to the Aortic Arch & Carotid Sinuses should
reflexly:
decrease heart rate & increase stroke volume
increase vascular resistance & decrease heart rate
decrease stroke volume & decrease vascular resistance
A.
B.
C.
D.
increase cardiac output & increase vascular resistance
Using the Baro-receptor feedback mechanism, the parasysmpathetic
nervous system can affect which of the following variables to adjust blood
pressure?
A.
heart rate
stroke volume
vascular resistance
B.
C.
D.
contractility
An individual possessing only the A & B antigens is said to be of which blo
fype?
A.
A+
В.
AB+
С.
AB-
D.
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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- In the absence of compensations, the stroke volume will decrease when a. blood volume increases. b.venous return increases. c. contractility increases. d.arterial blood pressure increases.arrow_forwardWhich of the following is true about the pacemaker potential in the heart? a. Decreased K+ efflux causes the resting membrane potential to increase b. Action potential occurs when T-type Ca2+ channels open c. Only the SA node in the heart has a pacemaker potential d. The atrioventricular node is needed to pace the sinoatrial node e. None of the options are truearrow_forwardIt is generally accepted that a relatively low diastolic vascular pressure is more important than a relatively low systolic vascular pressure because: A. diastolic vascular pressure is the pressure that determines the length of diastole. B. diastolic vascular pressure directly determines stroke volume. C. diastolic vascular pressure ultimately determines and controls contractility. D. diastolic vascular pressure is a force the heart must compete with to open the aortic valve. E. None of the above is correct.arrow_forward
- A 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_forwardAll of the following are correct about the isovolumetric contraction, except ____________. A. This phase of the cardiac cycle begins with the appearance of the QRS complex of the ECG, which represents atrial repolarization and ventricular depolarization B. It represents the time period between the closure of the AV valves and the opening of the aortic and pulmonic valves, ventricular pressure rises rapidly without a change in ventricular volume C. The rate of pressure increase in the ventricles is determined by the rate of contraction of the muscle fibers, which is determine by mechanisms governing excitation-contraction coupling D. Ventricular chamber geometry changes considerably as the heart becomes more spheroid in shape; circumference increases and atrial base-to-apex length increasesarrow_forward18.During exercise, all of the following occur EXCEPT A. increased stroke volume. B. increased cardiac rate. C. shunting of blood from visceral organs to skeletal muscle and heart. D. increased vasoconstriction of coronary arteries. 19. During moderate exercise cerebral blood flow A. increases. B. decreases. C. remains unchanged. 20.Expanded blood volume or high blood pressure stimulates stretch receptors in the atria of the heart causing increased secretion of A. atrial natriuretic peptide. B. aldosterone. C. epinephrine. D. parasympathetic antagonists 21. The last Korotkoff sound (muffled sound) occurs when the blood pressure is equal to A. atmospheric pressure. B. systolic pressure. C. diastolic pressure. D. pulmonary pressure 22. Blood pressure is measured with a A. sphygmomanometer. B. electrocardiograph. C. spirometer. 84539264 9arrow_forward
- Nursing When comparing Ist, 2nd and 3rd degree heart block: a. Which has the same contraction rate in the ventricles as in the atria? b. Which has (have) a slower ventricular rate than atrial rate? C. Which has a very slow but regular ventricular beat? d. In 3rd degree heart block, where is the atrial rate set? Where is the ventriclar rate set ?arrow_forwardwhy are cardiac muscle cells affected by hyperkalemia? A. All choices below are correct B. Resting membrane potential becomes less negative C. Voltage across the cardiac muscle cell cannot be maintained D. The cardiac muscle cell cannot respond to a nerve stimulusarrow_forwardAll the following statements regarding premature ventricular complexes (PVCs) are true except: a. Occasional PVCs may occur in persons without heart disease b. Bursts of two or more PVCs in a row may progress rapidly to ventricular tachycardia €. APVC that falls on or near a T wave may cause ventricular fibrillation d. Frequent PVCs in a patient without heart disease require no treatmentarrow_forward
- Ventricular cardiomyocytes under sympathetic drive during a bout of exercise... a. Would collectively make more force than at rest due to recruitment of more cardiomyocytes b. Would relax faster due to phosphorylation of the cardiac ryanodine receptors c. Would pump out more SV despite a decrease in EDV d. Would show an increased rate of myosin ATPase activity due to phosphorylation of the calcium ATPase pumps e. Would have elevated levels of cAMP and kinase activityarrow_forwardWhich of the following statements about Ca2+ handling in cardiac contractile cells is FALSE? a. One Ca2+ spark is sufficient to cause cross bridge cycling b. When Ca2+ ions flow out of the sarcoplasmic reticulum and into the cytosol, they create a Ca2+ spark c. Ca2+ released from the SR provides ~80% of the Ca2+ needed for muscle contraction d. Summed Ca2+ sparks from different RyR channels create a Ca2+ signal sufficient to cause cross bridge cycling e. Ca2+ sparks can be visualised using biochemical methodsarrow_forwardWhich of the following is not true for conduction of the cardiac impulse? A. Action potentials propagate by current flow through gap junctions. B. Slow propagation occurs as a result of low intercellular conductance. C. Slow propagation requires a slower (sustained) current source (1.e. Ca). D. Fast propagation occurs as a result of high intercellular conductance. E. All are true.arrow_forward
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