Question

question 28 (1 point)
some nerves of the autonomic nervous system terminate at the pacemaker cells of
the heart. these neurons secrete acetylcholine which decreases the heart rate. this
is an example of:
a) endocrine control
b) exocrine control
c) neural control
d) hormonal control
question 29 (1 point)
the resting potential of the neuron membrane:
a) is the same in every cell
b) is in muscle and nerve cells
c) is such that the outside is positive with respect to the intracellular fluid
d) needs all the charged particles of the cell to be separated.

Explanation:

• Question 28:
• Endocrine control involves hormones released into the bloodstream. Exocrine control is about secretion through ducts (e.g., digestive enzymes). Hormonal control is similar to endocrine. Here, neurons (nerves) secreting acetylcholine (a neurotransmitter) to affect heart rate is neural control as it's a nervous - system - mediated response.
• Question 29:
• The resting potential is not the same in every cell (varies by cell type). It is present in muscle and nerve cells. For a neuron, the resting potential has the outside positive relative to the intracellular fluid (due to ion gradients, mainly \(K^{+}\) and \(Na^{+}\) distribution). It does not need all charged particles to be separated, just a separation of certain ions (\(Na^{+}\), \(K^{+}\), etc.) across the membrane.

Answer:

• Question 28: C. neural control
• Question 29: C. is such that the outside is positive with respect to the intracellular fluid