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Assessment statements h6


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Assessment statements h6

  1. 1. H6 Gas Exchange - assessment statements
  2. 2. H.6.1 Define partial pressure. H.6.2 Explain the oxygen dissociation curves of adult hemoglobin, fetal hemoglobin and myoglobin. H.6.4 Explain the role of the Bohr shift in the supply of oxygen to respiring tissues.
  3. 3. H.6.3 Describe how carbon dioxide is carried by the blood, including the action of carbonic anhydrase, the chloride shift and buffering by plasma proteins. H.6.5 Explain how and why ventilation rate varies with exercise. Limit this to the effects of changes in carbon dioxide concentration leading to a lowering of blood pH. This is detected by chemosensors in the aorta and carotid arteries that send impulses to the breathing centre of the brain. Nerve impulses are then sent to the diaphragm and the intercostal muscles to increase contraction or relaxation rates.
  4. 4. H.6.6 Outline the possible causes of asthma and its effects on the gas exchange system. H.6.7 Explain the problem of gas exchange at high altitudes and the way the body acclimatizes.