高级水生生物化学.ppt

spongia platyhelminth annulata mollusc arthropod echinoderm * time Aquatic animal physiology and biochemistry Respiration and Metabolism By Fisher time Introduction The movement of O2 and CO2 between environment and gas exchange organs The movement of electrons between a series of carrier molecules within the mitochondria The respiratory gases are transferred between environment and tissues . Metabolism and respiration directly interact in that respiration processes time Respiratory Gases: Physical, Environment, and Physiological Considerations O2 and CO2 have very different properties with respect; to their rates of diffusion through and storage in both respiratory media and body fluids. The two respiratory media-air and water-have vastly different physicochemical properties. time Units in Respiratory and Metabolic Physiology units of quantity of gas the partial pressure of a gas the solubility of the gas the solubility coefficient and the capacitance coefficient time Diffusion of Respiratory Gases gas partial pressure. temperature dependent. time time Water and Air as Respiratory Environment Water equilibrium with the air a function of gas partial pressure at 15℃ low O2 capacitance, high absolute viscosity and density very high thermal capacitance hydromineral balance time Air as a respiratory medium low capacity heat sink water balance time Mechanisms and Structures for Gas Exchange Design Considerations delivered to the environmental side of a thin respiratory membrane. the respiration membranes should be as thin as possible the quantity of respiratory medium and body fluids the specific pattern of flow of water /air on one side of the respiratory membrane and blood on the other. time Mechanisms and Structures for Gas Exchange Integumentary Gas exchange in water and Air Oxygen and CO2 must be exchanged between environment and tis