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Jim is a 57-year old patient, sees his doctor because he has recently been tiring on exertion and having occasional heart palpitations on exertion. If he tries to continue to exercise, it gets worse, so whenever he experiences the fatigue or palpitations, he stop: exercising, indicating a reduced exercise capacity. Jim does not appear to be in distress at the time of examination in his doctor's office, but the doctor does detect a new heart murmur and notes that Jim's resting HR is 84 beats/min, which is elevated from his previous resting HR of 68 beats/min. The doctor refers Jim to have a cardiac catheterization procedure. Jim is diagnosed with aortic stenosis.

Jim is a 57-year old patient, sees his doctor because he has recently been tiring on exertion and having occasional heart palpitations on exertion. If he tries to continue to exercise, it gets worse, so whenever he experiences the fatigue or palpitations, he stop: exercising, indicating a reduced exercise capacity. Jim does not appear to be in distress at the time of examination in his doctor's office, but the doctor does detect a new heart murmur and notes that Jim's resting HR is 84 beats/min, which is elevated from his previous resting HR of 68 beats/min. The doctor refers Jim to have a cardiac catheterization procedure. Jim is diagnosed with aortic stenosis.

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Jim is a 57-year old patient, sees his doctor because he has recently been tiring on exertion and having occasional heart palpitations on exertion. If he tries to continue to exercise, it gets worse, so whenever he experiences the fatigue or palpitations, he stops exercising, indicating a reduced exercise capacity. Jim does not appear to be in distress at the time of examination in his doctor's office, but the doctor does detect a new heart murmur and notes that Jim's resting HR is 84 beats/min, which is elevated from his previous resting HR of 68 beats/min. The doctor refers Jim to have a cardiac catheterization procedure. Jim is diagnosed with aortic stenosis. Under resting conditions, CO is determined to be 4.8 L/min, which is very close to the expected "normal" of 5L/min.
Transcribed Image Text:Jim is a 57-year old patient, sees his doctor because he has recently been tiring on exertion and having occasional heart palpitations on exertion. If he tries to continue to exercise, it gets worse, so whenever he experiences the fatigue or palpitations, he stops exercising, indicating a reduced exercise capacity. Jim does not appear to be in distress at the time of examination in his doctor's office, but the doctor does detect a new heart murmur and notes that Jim's resting HR is 84 beats/min, which is elevated from his previous resting HR of 68 beats/min. The doctor refers Jim to have a cardiac catheterization procedure. Jim is diagnosed with aortic stenosis. Under resting conditions, CO is determined to be 4.8 L/min, which is very close to the expected "normal" of 5L/min.
4. Jim's resting HR has increased from normal. Explain the step-by-step process (the sequence of changes) beginning with the stimulus and ending with Jim's elevated HR. Do not skip steps. If there's a particular name for the process, be sure to use that name in your answer.
Transcribed Image Text:4. Jim's resting HR has increased from normal. Explain the step-by-step process (the sequence of changes) beginning with the stimulus and ending with Jim's elevated HR. Do not skip steps. If there's a particular name for the process, be sure to use that name in your answer.
Expert Solution
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From conception in the mother's womb until death, the typical heart beats. The number of heartbeats per unit of time is known as heart rate. Heart rate is usually represented as beats per minute (BPM). The left ventricle of the heart beats to deliver oxygenated, clean blood to the body's blood arteries via the aorta. The heart rate changes as the need for oxygen changes in various scenarios, such as exercise, sleep, and so on.

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