Unit 2 Fit for life课件31（牛津高中选修7）.pptVIP

? Boardworks Ltd 2006 * of 36 * of 36 ? Boardworks Ltd 2006 * of 36 ? Boardworks Ltd 2006 * of 36 ? Boardworks Ltd 2006 * of 36 ? Boardworks Ltd 2006 * of 36 ? Boardworks Ltd 2006 B1a Fit for Life 1. State that blood pressure measurements consist of diastolic and systolic information in mmHg (higher tier) Explain the possible consequences of having high (burst blood vessels, damage to brain, stroke, kidney damage) or low blood pressure (dizziness, fainting, poor circulation) 2. Describe how blood pressure will vary according to age and lifestyle (diet, exercise, weight, alcohol intake and stress) (higher tier) Discuss different ways of measuring fitness (strength, stamina, flexibility, agility, speed, as well as cardiovascular efficiency) 3. Explain the difference between fitness (physical activity) and health (free from infection) State and use the word and (higher tier) symbol equations for respiration with oxygen (aerobic respiration) 4. Explain that during hard exercise, the oxygen supply is insufficient to meet energy demands so anaerobic respiration takes place in addition to aerobic respiration. 5.State that this produces lactic acid which accumulates in muscles causing pain and fatigue 6. State the word equation for anaerobic respiration. State that anaerobic respiration releases less energy than aerobic respiration (higher tier) Explain fatigue in terms of lactic acid build up (oxygen debt) and how this is removed during recovery: ? hard exercise causes lack of oxygen in cells ? incomplete breakdown of glucose ? continued panting replaces oxygen allowing aerobic respiration ? increased heart rate ensures blood carries lactic acid away to the liver Blood pressure is a measure of the pressure exerted by the blood against artery walls. Blood pressure varies with: What is blood pressure? Blood pressure is measured as two numbers, e.g. 120/80. What do these numbers show? The numbers show pressure readings in mm of mercury. heartbeat strength blood volume