Human Physiology: An Integrated Approach (8th Edition)
8th Edition
ISBN: 9780134605197
Author: Dee Unglaub Silverthorn
Publisher: PEARSON
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Textbook Question
Chapter 14.3, Problem 18CC
Do you think that the Ca2+ channels in autorhythmic cells are the same as the Ca2+ channels in contractile cells? Defend your answer.
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Acetylcholine affects the graded potential of autorhythmic cells
Which of the following occurs at this point of the membrane potential (marked by the black arrow) in autorhythmic cells?
(A) A
(B) B
(C) C
(D) D
Which of these conditions occurs in the repolarization phase of an action potential in pacemaker cells?
A
voltage-gated Ca2+ ion channels are open
B
voltage-gated K+ ion channels are open
C
voltage-gated Na+ ion channels are open
D
all of these
Chapter 14 Solutions
Human Physiology: An Integrated Approach (8th Edition)
Ch. 14.1 - A cardiovascular system has what three major...Ch. 14.1 - What is the difference between (a) the pulmonary...Ch. 14.2 - Which is more important for determining flow...Ch. 14.2 - The two identical tubes below have the pressures...Ch. 14.2 - All four tubes below have the same driving...Ch. 14.2 - Two canals in Amsterdam are identical in size, but...Ch. 14.3 - What prevents electrical signals from passing...Ch. 14.3 - Prob. 8CCCh. 14.3 - Prob. 9CCCh. 14.3 - Compare the receptors and channels involved in...
Ch. 14.3 - If a myocardial contractile cell is placed in...Ch. 14.3 - A drug that blocks all Ca2+ channels in the...Ch. 14.3 - Which ions moving in what directions cause the...Ch. 14.3 - At the molecular level, what is happening during...Ch. 14.3 - Lidocaine is a molecule that blocks the action of...Ch. 14.3 - What does increasing K+ permeability do to the...Ch. 14.3 - A new cardiac drug called ivabradine selectively...Ch. 14.3 - Do you think that the Ca2+ channels in...Ch. 14.3 - What happens to the action potential of a...Ch. 14.3 - In an experiment, the vagus nerve, which carries...Ch. 14.4 - Name two functions of the AV node. What is the...Ch. 14.4 - Prob. 22CCCh. 14.4 - Occasionally an ectopic pacemaker {ktopos, out of...Ch. 14.4 - Prob. 24CCCh. 14.4 - Which chamberatrium or ventriclehas higher...Ch. 14.4 - Prob. 26CCCh. 14.4 - Prob. 27CCCh. 14.4 - Prob. 28CCCh. 14.4 - Prob. 29CCCh. 14.4 - Why does ventricular pressure shoot up suddenly at...Ch. 14.4 - Prob. 31CCCh. 14.4 - Prob. 32CCCh. 14.4 - A persons aortic valve opening has become...Ch. 14 - What contributions to understanding the...Ch. 14 - List three functions of the cardiovascular system.Ch. 14 - Prob. 3RQCh. 14 - Prob. 4RQCh. 14 - Prob. 5RQCh. 14 - Prob. 6RQCh. 14 - Prob. 7RQCh. 14 - Distinguish between the two members of each of the...Ch. 14 - Prob. 9RQCh. 14 - Prob. 10RQCh. 14 - What is the proper term for each of the following?...Ch. 14 - List the events of the cardiac cycle in sequence,...Ch. 14 - Prob. 13RQCh. 14 - Compare and contrast the structure of a cardiac...Ch. 14 - Prob. 15RQCh. 14 - Correlate the waves of an ECG with mechanical...Ch. 14 - Prob. 17RQCh. 14 - List and briefly explain four types of information...Ch. 14 - Define inotropic effect. Name two drugs that have...Ch. 14 - Prob. 20RQCh. 14 - Police Captain Jeffers has suffered a myocardial...Ch. 14 - Prob. 22RQCh. 14 - Prob. 23RQCh. 14 - Police Captain Jeffers in question 21 has an...Ch. 14 - Prob. 25RQCh. 14 - Prob. 26RQCh. 14 - Prob. 27RQCh. 14 - A person has a total blood volume of 5 L. Of this...
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- Thrombin activatesarrow_forwardWhich of these conditions results the unstable resting membrane potential seen in pacemaker cells? A Na+ ions move into the cell through specialized Na+ ion channels. B Membrane permeability to K+ ions increases. C Voltage-gated Ca2+ ion channels close. D All of these are correct.arrow_forwardProthrombin which helps in clotting of blood is released by: A. lymphocytes B. erythrocytes C. monocytes D. blood plateletsarrow_forward
- Which of the following forms of shock occurs as a result of expansion of the vascular compartment? Question 17 options: a) Cardiogenic b) Neurogenic c) Hypovolemic d) Obstructivearrow_forwardFill in the blank: An _______________________ is a recording of electrical changes occurring in the myocardium during a cardiac cycle.arrow_forwardPlease help in answering this question - more than one answer may be correct: The pulsatile flow created by the heart is converted to continuous flow by A) magic B) closing of the mitral valve C) resistance of the arteries D) resistance of the arterioles E) elasticity of arteriesarrow_forward
- Which types of cells or cell components play an essential role in the blood clotting? Group of answer choices Leukocytes Hemoglobin Plasma Erythrocytes Plateletsarrow_forwardfunctional injury to endothelial cells would most likely result in which of the following? a. hemorrhage per rhexis b. thrombosis c. hematoma d. hydrothoraxarrow_forwardThe ramp potential of pacemaker cells is caused by the opening of the: The ramp potential of pacemaker cells is caused by the opening of the: A. HCN channels B. voltage-gated sodium channels C. voltage-gated calcium channels D. voltage-gated potassium channelsarrow_forward
- In pacemaker cells the movement of __________ into the cell through voltage-gated channels is primarily responsible for the depolarization phase of the action potential. A Ca2+ ions B K+ ions C Na+ ions D Cl- ionsarrow_forwardPlsssssss helppppppp, what diseases might have contributed to this patients cause of death? -sudden cardiac arrest -valve defects Atrial and ventricular septal defects -hypertrophic cardiomyopathyarrow_forwardThrombocytopenia (throm-bo-sye-tow-pee-ne-ah) is a disorder that develops when certain drugs, bone marrow cancer, or radiation destroys red bone marrow, including stem cells that give rise to platelets. Predict a likely symptom of this disorder.arrow_forward
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