Which of the Following Mechanisms Is Used to Regulate Blood

question 113

Multiple Choice

Which of the following mechanisms is used to regulate blood pressure in the closed circulatory system of vertebrates?

• A) Changing the force of heart contraction
• B) Constricting and relaxing sphincters in the walls of arterioles
• C) Adjusting the volume of blood contained in the veins
• D) All of the above
• E) None of the above

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Definitions:

Neurotransmitter

Chemical substances that transmit signals across a synapse from one neuron to another in the nervous system.

Local Potential

Changes in the electric potential of a neuron's membrane that are confined to a small area, unlike action potentials that can spread.

Neurotransmitters

Chemicals released by nerve cells to transmit signals across a synapse to another nerve cell, muscle cell, or gland cell.

Synaptic Cleft

Space between the presynaptic and the postsynaptic membranes.