Action Potentials in the Heart Move from One Contractile Cell

question 45

Multiple Choice

Action potentials in the heart move from one contractile cell to the next via ________.

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

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Definitions:

Action Potential

is a rapid increase and subsequent decrease in voltage across a cellular membrane, typically in a neuron, that occurs when a neuron sends information down an axon.

Peak Voltage

The maximum absolute value of voltage in a periodic waveform, indicating the highest point the voltage reaches.

Persisting Positive Charge

A lasting electrical charge characterized by an excess of protons, often seen in certain particles or materials.

Negative Charge

An electrical charge that results from an excess of electrons in an atom or molecule, leading to an attraction to positively charged particles.