In the Context of Cardiac Nerve Supply,the Sympathetic Nervous System

question 3

Multiple Choice

In the context of cardiac nerve supply,the sympathetic nervous system:

• A) decreases the activity of the SA node, the AV node, and the myocardium.
• B) releases the neurotransmitter acetylcholine.
• C) has little effect on myocardial contraction.
• D) becomes active when the body needs to expend energy during the "fight or flight" reaction.

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Definitions:

Anaerobic

A type of exercise or biological process that occurs in the absence of oxygen, often leading to the production of lactic acid.

Aerobic Fitness

The ability of the heart, lungs, and circulatory system to supply oxygen efficiently during sustained physical activity.

Heart Attack

A medical emergency where the blood flow to the heart is suddenly blocked, resulting in damage to the heart muscle.

Cardiorespiratory Fitness

A health-related component of physical fitness that relates to the ability of the circulatory and respiratory systems to supply oxygen during sustained physical activity.