Given That Impulses from Parasympathetic Nerves Decrease Heart Rate, and That

question 9

Multiple Choice

Given that impulses from parasympathetic nerves decrease heart rate, and that the neurotransmitter for parasympathetic postganglionic fibers is acetylcholine (ACh) , predict how the following chemicals might affect heart rate.

• A)Pilocarpine, a drug that simulates the action of ACh, will decrease heart rate.
• B)Atropine, a drug that blocks the action of ACh, will decrease heart rate.
• C)Pilocarpine, a drug that simulates the action of ACh, will increase heart rate; and atropine, a drug that blocks the action of ACh, will decrease heart rate.
• D)Pilocarpine, a drug that simulates the action of ACh, will increase heart rate.

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Definitions:

Metaphase II

A phase of meiosis II in which chromosomes align at the equatorial plate before being separated into the daughter cells.

Meiosis

A type of cell division that reduces the chromosome number by half, creating four unique haploid cells, essential in sexual reproduction.

Figure Panel

A component of a graphical representation or illustration, often part of a larger series of diagrams or figures in scientific publications.

Metaphase I

A stage of meiosis I during which homologous chromosomes align at the cell's equator before being separated into two daughter cells.