Unit 1.2.2 #2
- Created by: neleanor
- Created on: 22-04-14 13:43
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- Unit 1.2.2 #2
- The Circulatory system
- Heart, Blood and Blood Vessels.
- Transports blood around the body to supply O2/nutrients and remove CO2
- Cardiovascular Fitness
- Heart Rate
- The number of times the heart beats per minute.
- Normal HR is between 60 and 80 BPM. Average is 72 BPM.
- During exercise, body requires more O2/nutrients so HR increase to supply demand.
- Can take pulse from Carotid Artery (neck) or Radial Artery (wrist)
- Heart Recovery Rate
- The speed at which the heart rate returns to resting after exercise. (Faster = Fitter)
- Blood Pressure
- The force exerted by circulating blood on the walls of the arteries.
- Bottom chambers of heart contract first to pump blood at high pressure into artieries (Systole)
- Top chambers contract second forcing blood into lower chambers (Diastole)
- Systolic BP is greatest, Diastolic BP is when it's low (120/80).
- Affecting factors
- Higher: Age, Weight, Alcohol, Smoking, >Salt, Stress, Altitude. Lower: Exercise.
- Stroke Volume
- The amount of blood pumped by the heart per beat.
- Cardiac Output
- The amount of blood pumped by the heart in one minute.
- HR x SV = CO
- Controlled by HR and SV
- The Circulatory system
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