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Homeostasis Consolidation Worksheet
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Homeostasis Consolidation Worksheet
Use the case study to answer all questions. Explain biological processes using stimulus, receptor, control centre and effector where appropriate. Australian spelling is used.
Homeostasis and feedback
Read the case study before answering Questions 1–8.
1.A person eats lunch containing carbohydrates. As glucose is absorbed, their blood glucose concentration rises above its usual range. The pancreas detects this change and releases insulin. Body cells take up more glucose, and the liver stores some glucose as glycogen. As blood glucose returns towards its usual range, insulin release decreases. Which statement best defines homeostasis?
- Maintaining relatively stable internal conditions despite internal or external change
- Keeping every substance in the body at exactly the same concentration
- Preventing any response to changes in the external environment
- Increasing a change until the body reaches a new permanent state
2.Use the lunch case study. Explain why the insulin response is an example of negative feedback.
3.Match each component in the feedback loop to its role. Write the correct letter beside each role.
- A. Receptor
- B. Control centre
- C. Effector
- 2. Detects a change in the regulated condition
- 3. Processes information and coordinates a response
- 1. Carries out a response that changes the regulated condition
4.Using the lunch case study, identify the stimulus, the control centre and one effector.
5.A student with Type 1 diabetes produces little or no insulin because pancreatic beta cells have been destroyed. Which body system is most directly involved in this disrupted regulation?
- Endocrine system
- Respiratory system
- Skeletal system
- Integumentary system
6.Explain one effect of insufficient insulin on blood glucose regulation. Include what happens to glucose uptake by cells or glucose storage by the liver.
7.Which intervention can help manage Type 1 diabetes by replacing the missing hormone?
- Administering insulin as prescribed and monitoring blood glucose
- Taking a medicine that prevents the pancreas detecting glucose
- Avoiding all water to reduce urination
- Increasing blood glucose deliberately after each meal
Apply and evaluate
Use your knowledge of feedback systems to interpret the scenarios. Distinguish a response that restores a regulated condition from one that amplifies a change.
8.During a hot afternoon, a person's body temperature rises. Sweating increases, and evaporation from the skin removes heat. State whether this is negative or positive feedback and explain how the response affects body temperature.
9.In childbirth, stretching of the cervix stimulates oxytocin release. Oxytocin strengthens uterine contractions, which increases cervical stretching and triggers further oxytocin release. Is this positive or negative feedback? Explain what happens to the original change.
10.A classmate says, “Homeostasis means the body's internal conditions never change.” Correct this statement in one or two sentences, using blood glucose after a meal as an example.
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