Principles of homeostasis and negative feedback (A-level only) (3.6.4.1) | AQA A-Level Biology - (7402) | KnowledgeSet

Principles of homeostasis and negative feedback (A-level only)

Biology · A-Level · AQA · AQA A-Level Biology - (7402) · Specification point · 3.6.4.1 · Organisms respond to changes in their internal and external environments (A-level only) · Homeostasis is the maintenance of a stable internal environment (A-level only)

Homeostasis

Negative feedback

Positive feedback

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3.6.4.1 Principles of homeostasis and negative feedback (A-level only)

Content	Opportunities for skills development
$Homeostasis in mammals involves physiological control systems that maintain the internal environment within restricted limits. The importance of maintaining a stable core temperature and stable blood pH in relation to enzyme activity. The importance of maintaining a stable blood glucose concentration in terms of availability of respiratory substrate and of the water potential of blood. Negative feedback restores systems to their original level. The possession of separate mechanisms involving negative feedback controls departures in different directions from the original state, giving a greater degree of control. Students should be able to interpret information relating to examples of negative and positive feedback.$

Content

Opportunities for skills development

Homeostasis in mammals involves physiological control systems that maintain the internal environment within restricted limits. The importance of maintaining a stable core temperature and stable blood pH in relation to enzyme activity. The importance of maintaining a stable blood glucose concentration in terms of availability of respiratory substrate and of the water potential of blood. Negative feedback restores systems to their original level. The possession of separate mechanisms involving negative feedback controls departures in different directions from the original state, giving a greater degree of control. Students should be able to interpret information relating to examples of negative and positive feedback.