BIO310H5 Lecture Notes - Lecture 13: Respiratory Pigment, Respiratory Epithelium, Red Blood Cell
Document Summary
Animals obtain o2 from the environment and use it for cellular respiration producing co2 and water. The amount of o2 dissolved in water is smaller than in the atmosphere ( vs co2) Less o2 dissolve in water at higher temp. O2 is the most abundant element in the earth"s crust and it is 20. 93% of the atmosphere. O2 is added to the atmosphere and water by photosynthesis. O2 and co2 are transferred passively through body surfaces ( depends on the size of the animals) -------the respiratory epithelium in larger animals. 0. 3 vol % oxygen: oxygen concentration in blood with respiratory pigment: if po2 is 95 mmhg, we would have 20 ml oxygen / 100 ml blood therefore, 20 vol % oxygen. Respiratory pigments differ in physical property such as color, structure, Each hemoglobin molecule can combine with four oxygen molecules, one per heme; the extent to which o2 is bound to hemoglobin varies with the partial pressure of oxygen po2.
