Neuromuscular Junction: Structure and Function
30 Questions
2 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the result of the local depolarization wave continuing to spread?

  • The fiber becomes refractory.
  • The permeability of the sarcolemma changes. (correct)
  • The axon terminal releases ACh.
  • The permeability of the sarcolemma decreases.

What happens to the Na+ channels during repolarization?

  • They close. (correct)
  • They remain open.
  • They become voltage-gated.
  • They open further.

What is the function of the Na+K+ pump?

  • To restore the resting polarity of the fiber. (correct)
  • To release ACh from the axon terminal.
  • To increase the permeability of the sarcolemma.
  • To generate an action potential.

What is the state of the fiber during the refractory period?

<p>It cannot be stimulated. (D)</p> Signup and view all the answers

What occurs during local depolarization?

<p>The end plate potential is generated on the sarcolemma. (C)</p> Signup and view all the answers

What is the result of K+ efflux during repolarization?

<p>The resting polarity of the fiber is restored. (A)</p> Signup and view all the answers

At which stage do Na+ channels close and K+ channels open?

<p>During repolarization (B)</p> Signup and view all the answers

What occurs during the latent period?

<p>Events of excitation-contraction coupling (C)</p> Signup and view all the answers

What is the number of polypeptide chains in a hemoglobin molecule?

<p>4 (A)</p> Signup and view all the answers

What type of channels are open during the generation of the end plate potential?

<p>Only Na+ channels (B)</p> Signup and view all the answers

What is the sequence of events that leads to muscle contraction?

<p>Transmission of an action potential, generation of the end plate potential, and excitation-contraction coupling (C)</p> Signup and view all the answers

What is the function of the heme group in hemoglobin?

<p>To bind with oxygen (A)</p> Signup and view all the answers

What is the role of ACh in the sequence of events?

<p>To bind to nicotinic receptors on the sarcolemma (B)</p> Signup and view all the answers

What is the name of the process by which blood cells are formed?

<p>Hematopoiesis (D)</p> Signup and view all the answers

Where does hematopoiesis occur in the body?

<p>Red bone marrow of axial skeleton (B)</p> Signup and view all the answers

What is the overall effect of the sequence of events?

<p>Muscle contraction (A)</p> Signup and view all the answers

What is the name of the cells that give rise to all formed elements in the blood?

<p>Hemocytoblasts (C)</p> Signup and view all the answers

What is the space between the axon terminal and the muscle fiber called?

<p>Synaptic cleft (D)</p> Signup and view all the answers

What percentage of CO2 is carried in the blood by carbaminohemoglobin?

<p>20% (D)</p> Signup and view all the answers

What is the role of voltage-gated Ca2+ channels in the neuromuscular junction?

<p>To open and allow Ca2+ to enter the axon terminal (A)</p> Signup and view all the answers

What is the function of acetylcholinesterase in the neuromuscular junction?

<p>To break down acetylcholine in the synaptic cleft (C)</p> Signup and view all the answers

What is the type of channel that allows simultaneous passage of Na+ into the muscle fiber and K+ out of the muscle fiber?

<p>Na+ K+ channel (C)</p> Signup and view all the answers

What is the purpose of the action potential arriving at the axon terminal?

<p>To release acetylcholine from the synaptic vesicles (D)</p> Signup and view all the answers

What is the location of the ACh receptors in the neuromuscular junction?

<p>In the junctional folds of the sarcolemma (B)</p> Signup and view all the answers

What is the normal stimulus for the homeostatic response to increase oxygen-carrying ability in the blood?

<p>Hypoxia (A)</p> Signup and view all the answers

What is the role of the kidney in the homeostatic response to hypoxia?

<p>To release erythropoietin (C)</p> Signup and view all the answers

What is the average lifespan of a red blood cell?

<p>100-120 days (D)</p> Signup and view all the answers

What happens to the heme part of hemoglobin when it is degraded?

<p>It is converted into bilirubin (D)</p> Signup and view all the answers

What is the final destination of the broken-down bilirubin in the body?

<p>The feces (A)</p> Signup and view all the answers

What is the fate of the globin part of hemoglobin when it is degraded?

<p>It is broken down into amino acids (C)</p> Signup and view all the answers

More Like This

PNS Final
59 questions

PNS Final

FearlessTransformation avatar
FearlessTransformation
Neuro Muscular Junction (NMJ) Quiz
6 questions
Muscle Relaxants and NMJ Overview
34 questions
Use Quizgecko on...
Browser
Browser