KIN 121 Lecture Notes - Lecture 16: Bradycardia, Tachycardia, Heart Rate
16 Dec 2015
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Document Summary
Muscles create force & move levers about fulcrums. Besides neural drive, muscles also need energy in order to contract. To maintain energy supply, nutrients must be delivered to muscle & by-products removed. Structure: chambers, heart tissue blood supply. Tachycardia persistent resting rate > 100. = heart rate (bpm) x stroke volume (ml/beat) in exercise intensity (linear relation) Max= highest rate achieved with all out effort. Heart rate during exercise: increases directly proportional to increases. Function: arteries, veins, capillaries, vasodilation, vasoconstriction. At rest: 50% of blood to liver an kidney, 15% of blood to muscles. Heavy endurance training: 80% blood to muscle. Blood pressure: systolic pressure 120 mmhg (> 200mmhg at peak exercise, diastolic pressure 80 mmhg (changes a little during exercise) Formed elements - 45%: mainly red blood cells (~99%) (erythrocytes, hemoglobin (found in red blood cells)- oxygen carrier. In 1 litre of blood, hemoglobin stores 200 ml o2.
