Nervous Tissue Chapter 12 Quiz

Questions and Answers

Why is myelin important? (Check all that apply)

It is formed to assist in the regeneration of damaged fibers. (correct)

It speeds up signal conduction in the nerve fiber. (correct)

It has no significant function.

It insulates the nerve fiber. (correct)

If the postsynaptic membrane potential reaches threshold level, an action potential will be produced.

True

Why does depolarization occur?

More Na+ diffuse into the cell than K+ diffuse out of it.

The resting membrane potential is negative due to which of the following?

Unbalanced ionic concentrations, mainly more Na+ outside and more K+ inside the cell. Signup and view all the answers

What is(are) the fundamental physiological properties that enable nerve cells to communicate with other cells?

Excitability, conductivity, and synaptic transmission. Signup and view all the answers

What is fast retrograde transport?

It returns used synaptic vesicles and other materials to the soma and informs the soma of conditions at the axon terminals. Signup and view all the answers

Study Notes

Importance of Myelin

Myelin speeds up signal conduction along nerve fibers.
It assists in the regeneration of damaged nerve fibers.
Myelin provides insulation for nerve fibers, preventing signal loss.

Action Potential Generation

An action potential is generated when the postsynaptic membrane potential reaches a threshold level.

Depolarization Mechanism

Depolarization occurs when more sodium ions (Na+) diffuse into the cell compared to potassium ions (K+) diffusing out.

Resting Membrane Potential

The resting membrane potential is negative due to the distribution of ions across the cell membrane, primarily influenced by sodium and potassium ion concentration.

Retrograde Transport

Fast retrograde transport is responsible for returning used synaptic vesicles and materials to the soma.
This process informs the soma about conditions at the axon terminals, aiding in cellular communication and maintenance.

Communication Properties of Nerve Cells

Nerve cells possess fundamental physiological properties that enable them to communicate effectively with other cells, such as excitability and conductivity.

Description

Test your knowledge on nervous tissue with this Chapter 12 quiz. Explore essential concepts such as myelin's role, action potentials, and depolarization mechanisms. Perfect for reinforcing what you've learned in the textbook.