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Transcript
Homeostasis Self-Assessment Homeostasis 1 Define Homeostasis 2 Say why homeostasis is necessary in living organisms. 3 Discuss the role of homeostasis in temperature, fluid balance and chemistry of cells and organisms Explain why organisms must maintain constant conditions in their cells and bodies 5 Explain the terms endoderm and ectoderm 6 Explain diffusion 7 Explain how organisms need to develop exchange systems which include the respiratory and excretory systems Explain how gases, nutrients and toxic wastes are exchanged by diffusion between cells and their environment Understand that the efficiency of exchange is proportional to the surface area over which diffusion can take place. Understand that large organisms have problems with diffusion Say how these problems of size can be overcome such as : a. the body may be flattened, thus reducing the distance between the two surfaces e.g. the leaves of plants b. increasing the surface area e.g. alveoli in the respiratory system c. c. the body may develop systems where the material is brought to the body surface e.g. by respiratory and excretory systems Explain why large active animals such as humans also require a circulatory system Say what factors control the rate of gaseous exchange and excretory functions. 8 9 10 11 12 13 Red Orange Green