Homework Help is Here – Start Your Trial Now!
Science
Biology
Which of the following are TRUE, when describing the Action Potential of a Non- Contractile Cardiac Pacemaker cell? Select ALL that are true. O Resting membrane potential is more polarized than in neurons, because of more Leakage channels for K+. Progressive Na+ channel (the "funny current", iNa) opening, activates a Transient Voltage Sensitive (T-type) Ca++ channel. Together these channels depolarize the membrane and activate Voltage-Sensitive Long-acting (L-Type) Ca++ channel. The resulting depolarization, closes the "funny" current and T-type Ca++ channels. O Action Potential depolarization, resulting from the Voltage-Activated Na+ channel, triggers Voltage-Sensitive Long-acting (L-Type) Ca++ channel. O Membrane depolarization triggers Voltage-Activated K+ channels (Delayed Rectifier) to open. Increasing K+ permeability and repolarizing the membrane. When the membrane polarizes to -60 mv, the Delayed Rectifier closes and a progressive Na+ channel (the "funny current", iNa) opens. The depolarized phase of Action Potential is prolonged (the "plateau phase") by simultaneous opening of the L-Type Ca++ channel and the Voltage-Activated (Delayed Rectifier) K+ channel. V At a membrane polarization of -60 my a progressive Na+ channel (the "funpy

Which of the following are TRUE, when describing the Action Potential of a Non- Contractile Cardiac Pacemaker cell? Select ALL that are true. O Resting membrane potential is more polarized than in neurons, because of more Leakage channels for K+. Progressive Na+ channel (the "funny current", iNa) opening, activates a Transient Voltage Sensitive (T-type) Ca++ channel. Together these channels depolarize the membrane and activate Voltage-Sensitive Long-acting (L-Type) Ca++ channel. The resulting depolarization, closes the "funny" current and T-type Ca++ channels. O Action Potential depolarization, resulting from the Voltage-Activated Na+ channel, triggers Voltage-Sensitive Long-acting (L-Type) Ca++ channel. O Membrane depolarization triggers Voltage-Activated K+ channels (Delayed Rectifier) to open. Increasing K+ permeability and repolarizing the membrane. When the membrane polarizes to -60 mv, the Delayed Rectifier closes and a progressive Na+ channel (the "funny current", iNa) opens. The depolarized phase of Action Potential is prolonged (the "plateau phase") by simultaneous opening of the L-Type Ca++ channel and the Voltage-Activated (Delayed Rectifier) K+ channel. V At a membrane polarization of -60 my a progressive Na+ channel (the "funpy

Human Physiology: From Cells to Systems (MindTap Course List)
Human Physiology: From Cells to Systems (MindTap Course List)
9th Edition
ISBN:9781285866932
Author:Lauralee Sherwood
Publisher:Lauralee Sherwood
Chapter9: Cardiac Physiology
Section: Chapter Questions
Problem 4TAHL
See similar textbooks
icon
Related questions
Question
Which of the following are TRUE, when describing the Action Potential of a Non- Contractile Cardiac Pacemaker cell? Select ALL that are true. O Resting membrane potential is more polarized than in neurons, because of more Leakage channels for K+. Progressive Na+ channel (the "funny current", iNa) opening, activates a Transient Voltage Sensitive (T-type) Ca++ channel. Together these channels depolarize the membrane and activate Voltage-Sensitive Long-acting (L-Type) Ca++ channel. The resulting depolarization, closes the "funny" current and T-type Ca++ channels. O Action Potential depolarization, resulting from the Voltage-Activated Na+ channel, triggers Voltage-Sensitive Long-acting (L-Type) Ca++ channel. OMembrane depolarization triggers Voltage-Activated K+ channels (Delayed Rectifier) to open. Increasing K+ permeability and repolarizing the membrane. When the membrane polarizes to -60 mv, the Delayed Rectifier closes and a progressive Na+ channel (the "funny current", iNa) opens. The depolarized phase of Action Potential is prolonged (the "plateau phase") by simultaneous opening of the L-Type Ca++ channel and the Voltage-Activated (Delayed Rectifier) K+ channel. V At a membrane polarization of -60 my a progressive Na+ channel (the "funpy
Transcribed Image Text:Which of the following are TRUE, when describing the Action Potential of a Non- Contractile Cardiac Pacemaker cell? Select ALL that are true. O Resting membrane potential is more polarized than in neurons, because of more Leakage channels for K+. Progressive Na+ channel (the "funny current", iNa) opening, activates a Transient Voltage Sensitive (T-type) Ca++ channel. Together these channels depolarize the membrane and activate Voltage-Sensitive Long-acting (L-Type) Ca++ channel. The resulting depolarization, closes the "funny" current and T-type Ca++ channels. O Action Potential depolarization, resulting from the Voltage-Activated Na+ channel, triggers Voltage-Sensitive Long-acting (L-Type) Ca++ channel. OMembrane depolarization triggers Voltage-Activated K+ channels (Delayed Rectifier) to open. Increasing K+ permeability and repolarizing the membrane. When the membrane polarizes to -60 mv, the Delayed Rectifier closes and a progressive Na+ channel (the "funny current", iNa) opens. The depolarized phase of Action Potential is prolonged (the "plateau phase") by simultaneous opening of the L-Type Ca++ channel and the Voltage-Activated (Delayed Rectifier) K+ channel. V At a membrane polarization of -60 my a progressive Na+ channel (the "funpy
channel, triggers Voltage-Sensitive Long-acting (L-Type) Ca++ channel. Membrane depolarization triggers Voltage-Activated K+ channels (Delayed Rectifier) to open. Increasing K+ permeability and repolarizing the membrane. When the membrane polarizes to -60 mv, the Delayed Rectifier closes and a progressive Na+ channel (the "funny current", iNa) opens. The depolarized phase of Action Potential is prolonged (the "plateau phase") by simultaneous opening of the L-Type Ca++ channel and the Voltage-Activated (Delayed Rectifier) K+ channel. At a membrane polarization of -60 mv, a progressive Na+ channel (the "funny current", iNa) opens, gradually depolarizing the membrane. The rapid depolarized phase of Action Potential is produced by opening of the L- Type Ca++ channel. Repolarization occurs when the L-Type Ca++ channel closes, and the Voltage-Activated K+ Channel (Delayed Rectifier) opens. A Graded Potential, arising from a neighboring muscle cell, depolarizes the membrane to a threshold of -50 mv, triggering Voltage-Activated Na+ channels to open. Increasing Na+ permeability rapidly depolarizes the membrane.
Transcribed Image Text:channel, triggers Voltage-Sensitive Long-acting (L-Type) Ca++ channel. Membrane depolarization triggers Voltage-Activated K+ channels (Delayed Rectifier) to open. Increasing K+ permeability and repolarizing the membrane. When the membrane polarizes to -60 mv, the Delayed Rectifier closes and a progressive Na+ channel (the "funny current", iNa) opens. The depolarized phase of Action Potential is prolonged (the "plateau phase") by simultaneous opening of the L-Type Ca++ channel and the Voltage-Activated (Delayed Rectifier) K+ channel. At a membrane polarization of -60 mv, a progressive Na+ channel (the "funny current", iNa) opens, gradually depolarizing the membrane. The rapid depolarized phase of Action Potential is produced by opening of the L- Type Ca++ channel. Repolarization occurs when the L-Type Ca++ channel closes, and the Voltage-Activated K+ Channel (Delayed Rectifier) opens. A Graded Potential, arising from a neighboring muscle cell, depolarizes the membrane to a threshold of -50 mv, triggering Voltage-Activated Na+ channels to open. Increasing Na+ permeability rapidly depolarizes the membrane.
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 2 steps

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Nervous system
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
  • SEE MORE QUESTIONS
Recommended textbooks for you
Human Physiology: From Cells to Systems (MindTap …
Human Physiology: From Cells to Systems (MindTap …
Biology
ISBN:
9781285866932
Author:
Lauralee Sherwood
Publisher:
Cengage Learning
Biomedical Instrumentation Systems
Biomedical Instrumentation Systems
Chemistry
ISBN:
9781133478294
Author:
Chatterjee
Publisher:
Cengage
Basic Clinical Lab Competencies for Respiratory C…
Basic Clinical Lab Competencies for Respiratory C…
Nursing
ISBN:
9781285244662
Author:
White
Publisher:
Cengage
SEE MORE TEXTBOOKS