Homeostasis: detect a change and respond
| English | 中文 | Pinyin |
|---|---|---|
| homeostasis/ˌhəʊmiːəˈstɑːsiz/ | 稳态 | wěn tài |
| effector/ɪˈfektə/ | 效应器 | xiào yìng qì |
What would explain this observation?
- The temperature outside can change while the body maintains a much narrower internal range. Control systems respond to change rather than keeping the outside environment constant.
- Start with a prediction. State the quantities or features you would compare, then decide what evidence could distinguish two explanations.
Build the model
- Homeostasis 稳态 regulates internal conditions of a cell or organism to maintain optimum conditions for function. It supports enzyme action and other cell functions. In humans the course examples are blood glucose concentration, body temperature and water levels. Control can involve nervous responses or chemical responses.
- homeostasis: Regulation of internal conditions to maintain optimum conditions for function; effector 效应器: A muscle or gland that produces a response in a control system.
Which component directly brings about a corrective response?
Receptors detect stimuli, or changes. A coordination centre such as the brain, spinal cord or pancreas receives and processes information. Effectors are muscles or glands that produce a response restoring suitable levels. A receptor detects a change; it is not necessarily the structure producing the corrective action.
Match each technical term to its precise meaning.
Use the definitions to distinguish related quantities and processes.
Choose evidence that can test it
- Receptors detect stimuli, or changes. A coordination centre such as the brain, spinal cord or pancreas receives and processes information. Effectors are muscles or glands that produce a response restoring suitable levels. A receptor detects a change; it is not necessarily the structure producing the corrective action.
- Use a paper control model with separate receptor, centre and effector cards. Present a stated change and follow the information and response arrows. Identify what the system measures and which internal condition it changes. The model must not claim that internal levels never fluctuate or that one organ alone performs every control function.
Which two habits make the investigation or model in this case more defensible?
Use a paper control model with separate receptor, centre and effector cards. Present a stated change and follow the information and response arrows. Identify what the system measures and which internal condition it changes. The model must not claim that internal levels never fluctuate or that one organ alone performs every control function.
Work from known quantities
- State the known values and their units. Choose the relation because its assumptions fit this case, then rearrange before substitution.
- Known: a fictional temperature-control record has a reference of 37.0 °C and readings of 36.8, 37.2 and 37.0 °C. Deviations are −0.2, +0.2 and 0.0 °C. The range is 0.4 °C. Small variation can coexist with regulation; these model values are not diagnostic thresholds or a request to measure students’ health.
A fictional record spans 36.7 to 37.3 °C. Calculate its range. Use the same sequence: known quantities → model → relation → substitution → unit and interpretation.
A fictional record spans 36.7 to 37.3 °C. Calculate its range.
The result is 0.6 °C. Known: a fictional temperature-control record has a reference of 37.0 °C and readings of 36.8, 37.2 and 37.0 °C. Deviations are −0.2, +0.2 and 0.0 °C. The range is 0.4 °C. Small variation can coexist with regulation; these model values are not diagnostic thresholds or a request to measure students’ health.
Check the conclusion and its limits
- Homeostasis maintains suitable internal conditions rather than a perfectly constant outside world. Receptor, coordination centre and effector describe roles, not interchangeable labels. Nervous and chemical systems can both contribute; detailed hormone-specific feedback is taught in its own section.
- Return to the original observation. Explain what the result supports, which conditions it assumes, and one way to test a competing explanation.
Homeostasis means the outside environment cannot change. This claim is false: Homeostasis maintains suitable internal conditions rather than a perfectly constant outside world. Receptor, coordination centre and effector describe roles, not interchangeable labels. Nervous and chemical systems can both contribute; detailed hormone-specific feedback is taught in its own section.
Homeostasis: detect a change and respond: Receptors detect stimuli, or changes. A coordination centre such as the brain, spinal cord or pancreas receives and processes information. Effectors are muscles or glands that produce a response restoring suitable levels. A receptor detects a change; it is not necessarily the structure producing the corrective action.
Homeostasis means the outside environment cannot change.
Homeostasis maintains suitable internal conditions rather than a perfectly constant outside world. Receptor, coordination centre and effector describe roles, not interchangeable labels. Nervous and chemical systems can both contribute; detailed hormone-specific feedback is taught in its own section.
Regulation of internal conditions to maintain optimum conditions for function: write the technical term.
homeostasis means Regulation of internal conditions to maintain optimum conditions for function.