Living Environment Homeostasis Regents Review

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What is homeostasis?

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Homeostasis is the process by which living organisms maintain a stable internal environment despite changes in external conditions.

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What is a stimulus?

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A stimulus is any change in the environment that causes a response in an organism.

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What is a response?

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A response is the reaction of an organism to a stimulus.

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What is the role of hormones in homeostasis?

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Hormones are chemical messengers that help regulate various functions in the body, including maintaining homeostasis by responding to changes in the internal environment.

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What is the immune system?

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The immune system is the body's defense mechanism against infections and diseases, involving various cells and proteins that identify and eliminate pathogens.

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What is an antigen?

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An antigen is a substance that triggers an immune response, often found on the surface of pathogens.

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What is an antibody?

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An antibody is a protein produced by the immune system that binds to specific antigens to help neutralize or eliminate pathogens.

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What is a vaccine?

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A vaccine is a substance that stimulates the immune system to recognize and fight specific pathogens, often containing weakened or inactive forms of the pathogen.

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What is an allergic reaction?

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An allergic reaction occurs when the immune system overreacts to a usually harmless substance, leading to symptoms like itching, swelling, or difficulty breathing.

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What is feedback mechanism?

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A feedback mechanism is a process that helps maintain homeostasis by regulating physiological functions through feedback loops.