The Sinoatrial Node Is Normally the Heart's Pacemaker Because It

question 47

True/False

The sinoatrial node is normally the heart's pacemaker because it has the fastest spontaneous rate of diastolic depolarization.

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Definitions:

Neurotransmitters

Chemical messengers that transmit signals across a chemical synapse, from one neuron to another target neuron, muscle cell, or gland cell.

Neuron

A nerve cell that is the basic building block of the nervous system, responsible for receiving, processing, and transmitting information through electrical and chemical signals.

Axons

Long, slender projections of nerve cells that transmit electrical impulses away from the neuron's cell body.

Axon Terminals

The very end of a branch of a neuron's axon, a region where neurotransmitters are stored before being released into the synaptic cleft.