Chapter 39 of 41
Revision Notes
Homeostasis — Revision Notes
Telangana Open School (TOSS) · Class 12 · Biology
Homeostasis revision notes for Telangana Open School (TOSS) Class 12 Biology: 4 topics in quick points. Includes Concept of Homeostasis, Thermoregulation.
44 questions30 flashcards5 concepts
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Key Topics to Revise
1
Concept of Homeostasis
- Homeostasis means 'maintaining a steady state' in the body.
- It ensures internal conditions like temperature, pH, water, and sugar levels remain stable.
- Examples include regulating water balance, blood sugar, pH, red blood cell count, and body temperature.
2
Thermoregulation and Its Importance
- Thermoregulation is the control of body temperature.
- Enzymes work best between 35–40°C; outside this range, they become inactive or denatured.
- Above 45°C: enzymes are destroyed, proteins denature, and cells may die.
3
Endotherms vs Ectotherms
- Endotherms (e.g., birds, mammals) generate internal heat to maintain body temperature.
- Ectotherms (e.g., frogs, fish, lizards) depend on external sources for body heat.
- Endotherms are also called warm-blooded or homeotherms.
4
Mechanism of Thermoregulation in Humans
- The hypothalamus acts as the body's thermostat.
- It receives input from temperature sensors in the skin and blood.
- When body temperature drops: vasoconstriction, shivering, and postural changes reduce heat loss and increase heat production.
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Full NotesKey Concepts
Homeostasis refers to the maintenanceIt is the process byEndotherms (like birds and mammals) generateA regulatory system where any deviationEvery homeostatic process involves four components
Frequently Asked Questions
What are the important topics in Homeostasis for Telangana Open School (TOSS) Class 12 Biology?
Key topics in Homeostasis include Concept of Homeostasis, Thermoregulation and Its Importance, Endotherms vs Ectotherms, Mechanism of Thermoregulation in Humans. Study these first, then practise questions on each for the Telangana Open School (TOSS) Class 12 board exam.
How should I revise Homeostasis for the Telangana Open School (TOSS) Class 12 board exam?
Learn the core ideas first, then work through the 44 practice questions on Homeostasis. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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