Although the Heart Does Not Require the Nervous System to Initiate

question 98

Multiple Choice

Although the heart does not require the nervous system to initiate contraction events _______________

• A) it is parasympathetically innervated via cardiac nerve fibres.
• B) it is parasympathetically innervated by vagus nerve fibres.
• C) it is innervated by the sympathetic division of the autonomic nervous system only.
• D) it is innervated by cortical nerve fibres.

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Definitions:

Dorsal and Ventral Respiratory Groups

Clusters of neurons in the medulla oblongata that regulate the rhythm of breathing through the control of respiratory muscles.

Reticular Activating System

A network of neurons located in the brainstem that is involved in regulating wakefulness and sleep-wake transitions.

Medullary Respiratory Center

A region in the medulla oblongata of the brain that regulates the rate and depth of breathing.

Ventral Respiratory Group

The ventral respiratory group is a cluster of neurons located in the medulla oblongata that plays a crucial role in regulating the rhythm of breathing.