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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.