Negative feedback helps maintain an optimal internal state in the context of a dynamic equilibrium. Positive feedback also occurs. What is the difference?
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Card 28
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Multicellular organisms are able to control the activities of different tissues and organs within their bodies. They do this by detecting ……….. and stimulating appropriate …………….:
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Card 29
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To do this plants use specific …………… ………...
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Card 30
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To do this animals use…………….. , or ………….. …………..or a combination of both.
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Card 31
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By responding to internal and external stimuli, animals increase their chances of survival by (2)
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Card 32
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What are responses to directional stimuli that can maintain the roots and shoots of flowering plants in a favourable environment called?
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Card 33
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Mammalian hormones are substances that stimulate their target cells via …………………...
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Card 34
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………………..and ……………..are local chemical mediators released by some mammalian cells and affect only cells in their immediate vicinity.
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Card 35
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Different substances are involved in coordinating responses in animals. Hormones are different from local chemical mediators such as histamine in the cells they affect. Describe how hormones are different in the cells they affect.
