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trnhua（trnhua） XxxHCO3- reaches the extracellular fluid through the exchange of extracellular anions, that is, tissue fluid, plasma, or lymph. Mainly related to the respiratory system. 3. tips: the body has a temperature regulation mechanism to maintain the constant temperature of the extracellular fluid. Details can refer to the contents of the second chapter on the body temperature regulation. The organs and systems involved in temperature regulation include the skin, liver, skeletal muscles, nervous system, endocrine system, respiratory system, etc.. 4. tips: metabolic waste cells produced mainly through the skin secretion of sweat, the three ways of urinary system formation and excretion of urinary and respiratory systems to breath discharge, the urinary excretion pathway system and respiratory system. For example, urea in the plasma is excreted mainly through urine formed by the kidneys. Plasma CO2 through pulmonary artery into the capillaries surrounding the alveoli, in the blood pressure is greater than the CO2 alveolar CO2 partial pressure, CO2 diffusion from the blood to the alveoli, and then excreted through the breath movement. [summary] brief. [homework] one or two questions for after-school exercises. [prompt] 1.C. 2.B. 3.B. 4. the direct living environment of capillary wall cells is plasma and tissue fluid, and the direct living environment of lymphatic vessel wall cells is lymph and tissue fluid. Expansion problem (1) alveolar wall and capillary wall. (2) digestion of food and absorption of nutrients. (3) reabsorption of renal tubules. (4) skin. The navigation Knowledge point Observation and thought Induction and conclusion The cells in the body live in the extracellular fluid Looking at the two diagram in the textbook P2, what is the difference between the environment in which the two cells live? What is body fluid? Is body fluid and blood a concept? Carefully observe the textbooks P3 in Figure 1-1, thinking about the relationship between plasma and