Which of the Following Structures Is Responsible for Movement of Action

question 55

Multiple Choice

Which of the following structures is responsible for movement of action potentials from one contractile cell to the next in the mammalian heart?

• A) chemical synapses using acetylcholine
• B) chemical synapses using norepinephrine
• C) intercalated disks
• D) non-myelinated motor neurons

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Definitions:

Adrenal

Pertaining to the adrenal glands, which sit atop each kidney.

Pancreas

An organ that secretes insulin and pancreatic digestive juice.

Palpitations

The sensation that the heart is racing, pounding, fluttering, or skipping beats, often associated with anxiety, stress, exercise, or medical conditions.

Tachycardia

A condition where the heart rate exceeds the normal resting rate, typically considered to be above 100 beats per minute in adults.