Cardiopulmonary Anatomy & Physiology
7th Edition
ISBN: 9781337794909
Author: Des Jardins, Terry.
Publisher: Cengage Learning,
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Question
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.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Post 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 threshold
Which one of these is an example of an excitatory postynaptic potential in a typical neuron?
a) A voltage change from -70mV to -70.5mV
b) A voltage change from +35mV to 0MV
c) A voltage change from 0mV to +0.35mV
d) A voltage change from -69.5mV to -70mV
Assume a neuron's membrane potential is -60 mV, what's the net consequence on the membrane potential of a 5 picoamp (pA) sodium current that occurs simultaneously with a 5 pA chloride current?
a. There's a 5 pA hyperpolarizing current
b. There's a 10 pA depolarizing current
c. There's a 10 pA hyperpolarizing current
d. There's a 5 pA depolarizing current
e. There's no change in the membrane potential
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
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Nerve membrane hyperpolarization after an action potential a)Is the movement of membrane potential voltage below normal resting potential voltage. b) This Is mostly due to the slow-closing of K+ channels. c)Makes it more difficult to evoke another action potential. d) This Is mostly due to the slow-closing of Na+ channels.arrow_forwardWhat is the electrical current that travels along neurons called? A. Neurotransmitter B. Action potential C. Contractions D. Electromagnetic wavearrow_forwardThe presence of an electrical gradient is responsible for both the resting membrane potential and the action potential in the neuron.a. In this case who is responsible for maintaining the electric gradient to produce a potential for the resting membrane?b. Explain what is meant by an electrical gradient in the context of a cell (neuron)!arrow_forward
- When summation of multiple graded synaptic potentials occurs which of the following would "neutralize/cancel out" an EPSP in dendrites? A. opening a voltage gated sodium channel B. opening a voltage gated calcium channel C. openning a ligand gated calcium channel D. closing a ligand gated potassium channel E. opening a ligand gated chloride channelarrow_forwardWhat guarantees that there are unidirectional action potentials? Choice A threshold B. Depolarization refractory period C. Absolute refractory period Relative refractory periodarrow_forwardincreases the probability of producing an action potential, where a ________ decreases the probability of producing an action potential. A. threshold; hyperpolarization B. repolarization; depolarization C. depolarization; hyperpolarization D. hyperpolarization; depolarization E. depolarization, repolarizationarrow_forward
- A common feature of action potentials is that they(A) cause the membrane to hyperpolarize and then depolarize.(B) can undergo temporal and spatial summation.(C) are triggered by a depolarization that reaches threshold.(D) move at the same speed along all axons.arrow_forwardA patch-clamp device is used to a. Study the properties of individual neurotransmitters b. Study the properties of individual membrane channels c. Measure the strength of an electrochemical gradient d. Infuse different kinds of ions into an axonarrow_forwardanatomy and psychology Choise What guarantees that there are unidirectional action potential? A. threshold B. depolarization refractory period C. absolute refractory period D. relative refractory periodarrow_forward
- After the depolarisation phase of an action potential, the resting potential is restored by ______. Question 15 options: A) the opening of voltage-gated potassium channels and the closing or inactivation of sodium channels. B) the opening of more voltage-gated sodium channels. C) a decrease in the membrane's permeability to potassium and chloride ions following closing of the chloride-potassium pump. D) a brief inhibition of the sodium-potassium pump.arrow_forwardA neuron may receive signals from thousands of synaptic terminals. What determines whether the receiving neuron will respond by transmitting a signal? a. the concentration of transmitter inside the receiving neuron b. the summation of excitatory and inhibitory signals received c. the number of glial cells contact the receiving neuronarrow_forwardDefine the following terms: a. Resting membrane potential b. Graded membrane potential c. Action potential d. Depolarization e. Repolarization f. Hyperpolarizationarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
The Cell Membrane; Author: The Organic Chemistry Tutor;https://www.youtube.com/watch?v=AsffT7XIXbA;License: Standard youtube license