IGCSE P.E: The Cardiovascular System.
- Created by: libbi15
- Created on: 30-09-15 17:46
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- The cardiovascular System.
- Key Terms:
- Stroke volume: The volume of blood pumped out of the heart by each ventricle by each contraction.
- Cardiac Output: The amount of blood leaving the heart per minute.
- Heart rate: The number of times the heart beats per minute.
- Systolic: The maximum pressure in the arteries when the heart contracts and pushes blood through the aorta to the body.
- Diastolic: The pressure of the blood when the heart is at relaxation.
- Blood pressure: The force of the blood against the blood vessels.
- Short-term Effects:
- Breathing faster and deeper to supply oxygen to the lungs
- Body temperature increases, heat regulates radiates from the muscles through the skin as sweat.
- Sweating occurs to cool us down, salt and water is lost and needs to be replaced or cramp will occur.
- Muscle fatigue occurs: Muscles need energy and oxygen, eventually the heart cant get oxygen quicky and anaerobic respiration taes place: lactic acid.
- Long-term effects:
- Increased stroke volume.
- Lower resting heart rate.
- Quicker heart rate recovery.
- Lower blood pressure.
- Healthier veins, arteries and capilleries.
- Size and volume of heart increases.
- Cardiac output decreases.
- Key Terms:
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