11. Nervous Tissue and Nervous System

The CNS can discriminate between strong and weak stimuli as strong stimuli __________.

A positive change in the membrane potential is called:

Why does depolarization occur in a neuron during an action potential?

When a neuron is stimulated, how does the membrane depolarize?

What happens when a resting neuron's membrane depolarizes?

During the action potential, when does sodium permeability initially decrease?

Heart rate is altered by stimulation of the SA node or the ______.

Which part of the action potential occurs when the voltage-gated Na⁺ channels are inactivating and voltage-gated K⁺ channels open?

How does a neuron cell membrane become depolarized?

Which of the following electrical events occurs when a certain threshold is reached?

Which of the following would be likely to cause depolarization of a neuron?

During which phase of an action potential are voltage-gated K⁺ channels open, while voltage-gated Na⁺ channels are closed?

Which of the following is characteristic of an action potential?

An action potential is a phenomenon that either happens completely or doesn't happen at all.