sci_bio

Homeostasis

Chapter summary, hard words and model exam answers for ICSE Class 10 Hindi.

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Biology · CBSE 10 · ICSE 10 · GCSE (AQA, Edexcel, OCR)

Cells and enzymes only work within narrow limits, so temperature, glucose, water and pH must be held near a fixed set point.

The response opposes the change, so it is called negative feedback. Once the value returns to normal, the response switches off.

The hypothalamus is the body's thermostat. Sweating and vasodilation lose heat; shivering and vasoconstriction save and make heat.

When blood is too concentrated, ADH makes the kidney reabsorb more water, giving small, concentrated urine - another negative feedback loop.

homeostasis	keeping the internal environment stable within narrow limits despite external change
negative feedback	a control loop in which the response opposes the change and returns the variable to its set point
set point	the normal value a variable is kept close to, such as 37°C for body temperature
receptor	a cell or organ that detects a change (stimulus) in the internal or external environment
effector	a muscle or gland that carries out the corrective response
hypothalamus	the region of the brain that monitors blood temperature and water balance
vasodilation	widening of skin blood vessels to increase blood flow and lose more heat
ADH	antidiuretic hormone; makes the kidney reabsorb more water when blood is too concentrated

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