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How does posture(Supine vs. Upright Position)affect stroke volume, heart rate and cardiacoutput at rest?? Effect on venous return?

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Elin Hessel
Elin HesselLv2
28 Sep 2019

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Miguel Induran (a former world class cyclist)is reported to have a resting heart rate of 29 beats per minute.Explain how this is possible. Using normal values for cardiacoutput, heart rate, etc. determine what the stroke volume would befor this cyclist at rest and what his cardiac output should be atexercising heart rates. (2 points)

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Encircle the correct word in the parenthesis about ECG.

Changing from supine to seated position and during inhalation increases heart rate, which is seen as a/n (increase/decrease) in the time interval between adjacent R-waves in the ECG. This is a result of (increase/decrease) in venous return which in turn will (increase/decrease) cardiac output and (increase/decrease) arterial blood pressure. This change in arterial BP will be sensed by baroreceptors. Baroreceptors will (increase/decrease) its firing rate to the medulla oblongata. The medulla oblongata will then (inhibit/stimulate) the SA nose which results in an (increase/decrease) in heart rate. This is a (sympathetic/parasympahthetic) effect to the heart.

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