HOMEOSTASIS

Question 1

WHAT IS HOMEOSTASIS

Answer 1

• Homeostasis is the maintenance of a constant internal environment.
• We require such an environment inside our bodies to enable cells to function at an optimum level.

Question 2

CELLS - HOMEOSTASIS

Answer 2

• Cells are surrounded by fluid, and it is the composition and temperature of this fluid that must be maintained within very fine limits.

Question 3

HOMEOSTASIS ENSURES THAT THE FLUID ENVIRONMENT OF THE CELLS:

Answer 3

• Contains the optimum concentration of nutrients, ions, gasses and water
• Stays at a constant temperature- the optimum temperature for normal cell functioning
• Is maintained at the optimum pressure

Question 4

MAINTAIN HOMEOSTASIS

Answer 4

• To maintain homeostasis the body must be able to sense changes in the internal and external environment and must be able to compensate for those changes.

Question 5

NERVOUS AND ENDOCRINE SYSTEM

Answer 5

• The nervous and endocrine systems are the main sensory and controlling body systems and, in the case of homeostasis, they operate through feedback systems, many of which involve negative feedback.