HWP 420 Study Guide - Final Guide: Sinoatrial Node, Parasympathetic Nervous System, Stroke Volume
4 Nov 2018
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As you begin the 1. 5 mile run test, heart rate increases linearly, increasing intensity until reaching the maximum heart rate. It will continue to increase exponentially until it reaches the plateau or steady-state heart rate. The heart rate is controlled by the sinoatrial node(heart"s pacemaker) sending electrical signals initially to the heart beating a hundred beats per minute. When an individual start running, it triggers stress on the body. As muscles are converting continuously, they lose blood and requires more oxygen uptake, allowing the body to have more carbon dioxide that must be exhaled. As this continues, thermoreceptors, chemoreceptors, and baroreceptors monitor changes in the body and send signals back to the brain to adjust accordingly. This causes skin, kidneys, liver, etc to maintain homeostasis through positive and negative feedback. As temperature increases, the thermoreceptors sense this change in the blood, and send a signal back to the sns to continue to increase heart rate.
