Following Neurotransmitter Activation of Chemically Gated Channels

question 17

Multiple Choice

Following neurotransmitter activation of chemically gated channels,

• A) the Na⁺ channels open for a brief time generating a local current.
• B) the cell may reach threshold.
• C) the inside of the membrane becomes more positive
• D) a local potential is generated
• E) All of these are correct.

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Definitions:

Precapillary Sphincter

A ring-like muscle at the entrance of capillaries that regulates blood flow into the capillary.

Atrial Natriuretic Hormone

A hormone, secreted by heart's atria, that regulates blood pressure by reducing sodium ion concentration in the blood, thus decreasing blood volume.

Vasopressin

A hormone produced by the pituitary gland that helps regulate water balance in the body and constriction of blood vessels.

Angiotensin II

A peptide hormone that causes blood vessels to constrict, increasing blood pressure.