UNIT 3 EXAM - ACUTE RESPONSES

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4 Terms

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Systems

Cardiovascular, muscular and respiratory

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Respiratory

  • Increased respiratory rate - to meet oxygen demands

  • Increased tidal volume (air in litres taken in per breath)

  • Increased ventilation (RR x TV) - Litres per minute

  • Increased gaseous exchange

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Cardiovascular responses

  • Increased heart rate

  • Increased Cardiac output (Q = HR x SV)

  • Increased blood pressure, systolic (leaving the heart), diastolic (ventricle fills)

  • Vasoconstriction and vasodilation

  • Increased avo2 (arterial blood - away from heart, and venous blood - toward heart)

  • Increased Stroke volume (amount squeezed out - has finite capacity)

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Muscular Responses

  • Increased motor unit recruitment (the motor neuron and all of the muscle fibres that it innovates) - rate and amount of units required increases

  • Increased use of fuels and substrates

  • Increased muscle temperature - aerobic byproduct

  • Increased blood flow to working muscles

  • Increased enzyme activity