11. Nervous Tissue and Nervous System

rank

Practice this topic

Multiple Choice

Which of the following is the MOST important factor in generating resting membrane potential?

452

rank

Which type of ion channel opens when a chemical binds to it?

Multiple Choice

The movement of which ion out of the cell through leakage channels establishes the negative membrane potential?

Which of the following membrane ion channels open and close in response to changes in the membrane potential?

Which of the following membrane ion channels in the neuron are always open?

The sodium-potassium ion pump will __________.

Relative to extracellular fluid, the interior of a neuron has a negative charge because __________.

In a neuron, a membrane potential of –90 mV is considered __________.

Which of the following statements best describes the resting membrane state in the neuron?

1152

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

a. The resting membrane potential refers to the voltage difference across the membranes of excitable cells at rest.

A hypothetical poison blocks K+ leak channels. How would this affect the resting membrane potential of skeletal muscle fibers? Explain your reasoning.

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

a. The resting membrane potential refers to the voltage difference across the membranes of excitable cells at rest.

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

b. The concentration of Na+ is highest in the cytosol, and the concentration of K+ is highest in the extracellular fluid.

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

c. The Na+/K+ pumps and gated channels maintain the Na+ and K+ gradients necessary for action potentials to occur.

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

d. A depolarization is a change in membrane potential that makes the potential less negative.