Respiration Processes & Gas Diffusion: Exchange, Rates, Control, Quizzes of Biochemistry

Download Respiration Processes & Gas Diffusion: Exchange, Rates, Control and more Quizzes Biochemistry in PDF only on Docsity! TERM 1 Exchange of Gases DEFINITION 1 Occurs by passive diffusionResponse to concentration gradientsGoverned by partial pressures of gasesDalton's Law air is mixture of gases each gas has its own pressure called a partial pressure (p) 760 mm Hg represents combined partial pressures of individual gases (o2, co2, n2, h20) gases move from high p to low p TERM 2 External Respiration DEFINITION 2 betweenalveoliand bloodpo2 in alveoli = 105 mm Hgpo2 in blood = 40 mm Hgo2 moves into bloodpco2 in alveoli = 40 mm Hgpco2 in blood = 45 mm Hgco2 moves into alveoli TERM 3 Internal Respiration DEFINITION 3 between blood and systemic tissue cellspo2 in blood = 100 mm Hgpo2 in tissue cells = 40 mm Hgo2 moves into tissue cellspco2 in blood = 40 mm Hgpco2 in tissue cells = 45 mm Hgco2 moves into blood TERM 4 Rates of Gas Diffusion Depends On DEFINITION 4 Partial pressure and altitudeDiffusion distance = respiratory membrane thickness (0.5 micro m) thicker = slowerSolubility & Molecular Weight of Gases =o2 smaller molecule - faster diffusionco2 more soluble - faster outward diffusionLarge surface area of alveoli - more space for diffusion TERM 5 Foetal Haemoglobin DEFINITION 5 Structure is different to adult HbFHb has higher affinity for o2Allows transfer across placentaPlacenta maternal blood has low po2 so FHb can saturate and carry more o2.Dissociation curve shifts left.