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D5–D6 Adaptations and Additional Factors Categorise
Target Level
Pass
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Responses
Adaptation
Increase in heart rate to deliver oxygen and nutrients and remove waste products (lactic acid and carbon dioxide) in order to delay fatigue
Faster recovery of heart rate due to increased efficiency
Cardiac hypertrophy leading to increased strength of contractions and thus increased volume of blood ejected each heart beat
Increase in resting and exercising stroke volume leading to increased efficiency to deliver O2 and remove CO2
Increase in heart rate known as anticipatory rise
Lower resting blood pressure, resulting in less pressure exerted on vessel walls
Increase in Cardiac Output so more blood is delivered to the working muscles
Lower resting heart rate as a result of hypertrophy and the heart pumping more blood per beat
Vasoconstriction of the artieroles supplying the inactive internal organs to redirect blood flow
Increase in systolic blood pressure
Capillarisation (increased number of capillaries) of skeletal muscle and alveoli leading to increased rate of diffusion
Vasolidation at the arterioles supplying skeletal muscles
Increase in blood plasma volume allowing more O2 and nutrients to be delivered