IB Biology Topic D3.3.1: Homeostasis Notes

Homeostasis Keeps the Internal Environment Stable

Living things depend on stable internal conditions, even when the outside environment changes.

This balance is called homeostasis, and it lets cells survive and work efficiently.

Definition

Homeostasis

Homeostasis is the maintenance of a stable internal environment within an organism, ensuring optimal conditions for cellular processes.

Cells Need Stable Conditions to Work

Cells only work properly within a narrow range of conditions:

Temperature sets the pace of enzyme activity: too hot and enzymes denature, too cold and reactions slow.
pH affects protein shape, so large changes can stop enzymes working.
Glucose supplies energy, so its level sets how much fuel cells receive.
Water balance controls osmosis, which stops cells shrinking or bursting.

Keeping these variables steady lets cells function despite changes outside the body.

Note

Tissue fluid and blood plasma carry these conditions to every cell, keeping the whole body's internal environment stable.

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Definition

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IB Biology Topic D3.3.1: Homeostasis Notes

Homeostasis Keeps the Internal Environment Stable

Cells Need Stable Conditions to Work

Homeostasis Works Through Receptors, a Control Centre, and Effectors

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Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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Homeostasis Keeps the Internal Environment Stable

Cells Need Stable Conditions to Work

Homeostasis Works Through Receptors, a Control Centre, and Effectors

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic D3.3.1: Homeostasis Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Homeostasis Keeps the Internal Environment Stable

Cells Need Stable Conditions to Work

Homeostasis Works Through Receptors, a Control Centre, and Effectors

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Homeostasis Keeps the Internal Environment Stable

Cells Need Stable Conditions to Work

Homeostasis Works Through Receptors, a Control Centre, and Effectors

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account