Nimo

Study smarter with Nimo

Personalised revision that adapts to you. Ace your revision with unlimited practice questions that are designed to help you learn faster. We're slowly rolling out to more and more students.

Try Nimo

Introduction to homeostasis

Homeostasis and response • Homeostasis

Key concepts

What you'll likely be quizzed about

  • Homeostasis is the maintenance of a stable internal environment that supports enzyme activity and cellular function.
  • It encompasses regulation at cell, tissue, and whole-organism levels to keep essential variables within optimal ranges for health.
  • Homeostasis is defined as the regulation of the internal environment of a cell or organism to sustain optimal conditions for function.

Flashcards

Test your knowledge with interactive flashcards

What are the three main parts of a homeostatic system?

Click to reveal answer

A homeostatic system consists of a receptor, a control centre, and an effector.

Key notes

Important points to keep in mind

Homeostasis maintains internal conditions near set points for optimal enzyme and cell function.

Homeostatic systems follow receptor → control centre → effector sequence.

Negative feedback produces corrective effects opposite to the initial change.

Blood glucose regulation uses insulin and glucagon released by the pancreas.

Water balance uses ADH from the pituitary to alter kidney reabsorption of water.

Temperature regulation employs vasodilation, vasoconstriction, sweating, and shivering in response to changes.

Nervous coordination delivers rapid, short-term responses; hormonal coordination yields slower, lasting effects.

Homeostatic failure occurs when conditions exceed regulatory capacity, risking issues like hypothermia or hyperthermia.

Set points are the normal ranges maintained by control centres for physiological variables.

All homeostatic processes involve negative feedback mechanisms.

Built with v0