Cardiac Muscle Analysis

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During exercise the body adapts to the stress by adjusting many of its physiological functions. Due to the stressor of exercise: heart rate, venous return, stroke volume, blood flow (to certain areas), mean arterial blood pressure, and cardiac output all increase (Sherwood 2015). The increase in cardiac output is due to the increase in heart rate and stroke volume. This change in stroke volume is a direct result of the increase on oxygen demand in skeletal muscle.
When exercising the sympathetic nervous system stimulates the sinoatrial and atrioventricular nodes. The cardiac accelerator nerve connects the sympathetic fibres in the medulla of the brain to the sinoatrial node in the heart via, the vagus nerve; and innervates both the sinoatrial

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