Heart:Relaxes to fill with blood. Contracts to squeeze blood out. Blood Pressure: measured in mm Hg. Two measurements; eg. 120/80mm hg. Systolic(first number), when heart contracts. Diastolic(second number), when heart relaxes. Factors: -weight -stress -smoking - alcohol -diet high in fat, sugar and/or salt.High blood pressure is dangerous as blood vessels can weaken and burst, which could lead to a stroke.Low blood pressure results in poor blood circulation, which can cause dizziness,fainting and cold hands and feet. Pulse: Resting pulse, 60bpm to 100bpm. Increase in breathing rate and pulse rate because: -deliver oxygen and glocose to cells in muscles more quickly. -remove carbon dioxide more quickly.Heathly means being free from infection.Fit means how much physical activtiy you're capable of doing.Cardiovascular Efficiency means how well your heart copes and recovers with aerobic exercise. Aerobic Respiration:is the release of energy from glucose in the presence of oxygen.Word equation: Glucose+Oxygen->Carbon Dioxide+Water+Energy.Anerobic Respiration: takes place in the absence of oxygen.It quickly releases a small amount of energy through the incomplete breakdown of glucose.Word:Glucose->Latic acid+Energy.Occurs when muscles are working so hard that not enough oxygen can't be delivered to break down all the available glucose through aerobic respiration.Latic acid:toxic to cells.After anerobic exercise your heart rate stays high to remove latic acid from muscles. Deep breathing continues ensuring enough oxygen is taken in to oxidise the latic acid.
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