Which of the following are responsible for a receptor adapting to a stimulus?

A) Na+ channel inactivation only
B) Na+ channel inactivation or K+ channel opening
C) opening of Na+ channels only
D) opening of K+ channels only
E) K+ channel inactivation only


B) Na+ channel inactivation or K+ channel opening

Anatomy & Physiology

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What bone in the neck does not articulate with any other bone?

a. Hyoid b. Mandible c. Stapes d. Clavicle

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List, in order, the structures of the respiratory membrane that carbon dioxide must cross to move from the blood into an air sac of the lung

What will be an ideal response?

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The concentration gradient for

a. K+ favors its movement into the ECF b. Na+ favors its movement out of the cytosol c. K+ and Na+ are maintained by active transport d. Na+ opposes the electrical gradient for Na+ e. Cl- favors its movement out of the cytosol

Anatomy & Physiology

The function of melanin in the skin is to

A. help regulate body temperature. B. protect against UV light. C. keep the epidermis soft and pliable. D. prevent infections. E. reduce water loss.

Anatomy & Physiology