Which Structural Feature of Cardiac Muscle Cells Enables Action Potentials

question 63

Multiple Choice

Which structural feature of cardiac muscle cells enables action potentials to travel rapidly from cell to cell?

• A) mitochondria
• B) desmosomes
• C) gap junctions
• D) myofibrils
• E) myoglobin

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Definitions:

Neurotransmitters

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

Autonomic Nervous System

The part of the peripheral nervous system that controls involuntary functions in the body, such as heart rate, digestion, and respiratory rate.

Spinal Reflexes

Automatic, involuntary movements or actions of the body initiated in the spinal cord without the involvement of the brain.

Somatic Nervous System

The part of the peripheral nervous system that controls voluntary movements of the body and transmits sensory information to the central nervous system.