Cardiopulmonary Anatomy & Physiology
7th Edition
ISBN: 9781337794909
Author: Des Jardins, Terry.
Publisher: Cengage Learning,
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Chapter 12, Problem 10RQ
Summary Introduction
Introduction:
The resting state or the polarized state is the state during which the heart is relaxed and is not generating an action potential. Depolarization of the heart muscles refers to the rapid inward flow of the sodium ions through sodium ion channels. Repolarization is the process through which the cardiac cells return to the resting state.
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Chapter 12 Solutions
Cardiopulmonary Anatomy & Physiology
Ch. 12 - 1. Which of the following is the rapid upstroke in...Ch. 12 - Prob. 2RQCh. 12 - Prob. 3RQCh. 12 - Prob. 4RQCh. 12 - Which of the following slows the heart rate and AV...Ch. 12 - Prob. 6RQCh. 12 - Prob. 7RQCh. 12 - Which of the following means the ability to...Ch. 12 - An electrical difference across the fibers of the...Ch. 12 - Prob. 10RQ
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- Depolarization and repolarization changes that occur during the action potential are produced by a. Negative feedback loops b. Channel mediated transport c. Simple diffusion of ions down their concentration gradient d. Active transport pumps along the neuron membranearrow_forwardInjecting potassium into the blood stream stops the heart. In this case, cardiac muscle cells would be stuck in the Select one: a. Absolute refractory period b. Resting state c. Relative refractory periodarrow_forwardThe made-up drug leakyhose degrades myelin resulting in myelin becoming more porous and therefore a poor insulator. 2.) Which of the following would NOT be an effect of leakyhose? A. Propagation of the action potential would likely slow B. The action potential may degrade because it can’t properly be regenerated C. The action potential would not propagate but would rather reverse directions D. Saltatory conduction may be disrupted E. All of the above effects are consistent with the administration of leakyhosearrow_forward
- Which of the following is the plateau stage of the action potential? A. Phase 0 B. Phase 1 C. Phase 2 D. Phase 3arrow_forwardA. There is a lower resistance in the lower panel at the point where voltage is measured. B. There is a greater capacitance in the lower panel at the point where voltage is measured. C. The membrane voltage measured in the lower panel is farther away from the current pulse.arrow_forwardPost synaptic neurons membrane potentials are less negative than resting membrane potentials when this occur A. Creates a new set point for the resting membrane potential B. Has a lower propensity to produce an action potential C. Reacts by generating action potential D. Higher chance of reaching the potential thresholdarrow_forward
- A local potential will only lead to an action potential if is reached O a. depolarization b. resting membrane potential c. hyperpolarization d. thresholdarrow_forwardDuring an action potential, the inside of the cell membrane becomes more positive than the outside. Why does this happen? a. During depolarization, the sodium ions rush in and the potassium ions have not begun rushing out, making the inside more positive. b. During depolarization, the sodium ions rush in and the potassium ions have not begun rushing out, making the outside more positive. c. During depolarization, the potassium ions rush in and the sodium ions have begun rushing out, making the inside more positive. d. During depolarization, the sodium ions rush in and the potassium ions have begun rushing out, making the outside more positive.arrow_forwardDraw and discuss an AP (action potential). Below this graph draw and discuss the conductance of the important ions moving across this membrane that makes the action potential work. a. Cardiac fiber (non automatic cells) b. SA (self excitable cells)arrow_forward
- Which of the following is the rapid upstroke in the action potential?A. Phase 0B. Phase 1C. Phase 2D. Phase 3arrow_forwardAny change in a neuron's membrane potential that moves the membrane potential to a value more negative than the resting potential (e.g. -120mv) is: a. Hypopolarization b. Depolarization c. An action potential d. HyperpolarizationNOTE: A IS INCORRECTarrow_forwardA. the fact that one represents a depolarization and the other represents a hyperpolarization. B. the capacitive properties of the membrane. C. the difference in applied voltage.arrow_forward
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