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Unit 6 - Homeostasis and Health Content Expectations: B2.3A: Describe how cells function in a narrow range of physical conditions, such as temperature and pH (acidity) to perform life functions. Clarification: Descriptions will be limited to those listed in the content expectation (temperature and pH). B2.3B: Describe how the maintenance of a relatively stable internal environment is required for the continuation of life. Clarification: Systems involved in homeostasis will be limited to the nervous, digestive, immune, circulatory, respiratory and excretory systems of organisms. B2.3C: Explain how stability is challenged by changing physical, chemical, and environmental conditions as well as the presence of disease agents. Clarification: See clarification above. B2.3e: Describe how human body systems maintain relatively constant internal conditions (temperature, acidity, and blood sugar). Clarification: Mechanisms involved are limited to those pertaining to the examples listed in the content expectation. B2.3f: Explain how human organ systems help maintain human health. Clarification: Systems described are limited to those involved in nutrition, cardiovascular and respiratory health. B2.6a: Explain that the regulatory and behavioral responses of an organism to external stimuli occur in order to maintain both short- and long-term equilibrium. Clarification: The expectation is limited to explanation involving the nervous and immune systems and hormone control as governing response to external stimuli.