When a neuron is activated by a threshold stimulation, ________ channels open, which allows these ions to quickly ________.

A. potassium ion; diffuse into the neuron
B. potassium ion; diffuse out of the neuron
C. sodium ion; diffuse into the neuron
D. sodium ion; diffuse out of the neuron


Answer: C

Anatomy & Physiology

You might also like to view...

What cell type constitutes the highest percentage of islet cells within the pancreas?

a. epsilon cells b. alpha cells c. beta cells d. delta cells e. gamma cells

Anatomy & Physiology

The least numerous but the largest of the papillae are arranged as a V-shape on the posterior dorsal surface of the tongue. They contain the majority of taste buds and are called ________ papillae.

A. papiform B. filiform C. foliate D. vallate E. fungiform

Anatomy & Physiology

Specialized ganglionic sympathetic neurons that release hormones into the bloodstream are found within the

A) intramural ganglia. B) collateral ganglia. C) chain ganglia. D) brain stem. E) adrenal medullae.

Anatomy & Physiology

A collection of cells that work together designates a(n)

A) chemical. B) organ. C) tissue. D) organ system. E) molecule.

Anatomy & Physiology