The maintenance of a constant internal environment .

Define negative feedback .

A mechanism that reverses a change away from the set point to return conditions to normal.

Why is homeostasis important for the body?

It keeps internal conditions within set limits so that reactions in cells can work and the organism can live.

Examples include: temperature blood glucose concentration water concentration

Control systems are switched on to reduce it back to the set point.

Control systems are switched on to raise it back to the set point.

Homeostasis is the maintenance of a constant internal environment.

Negative feedback keeps internal conditions within a narrow range of the set point.

True. It maintains a constant internal environment so that cell reactions can function properly.

False. In negative feedback a rise switches on systems that reduce it, returning it to the set point.

O LevelBiologyCambridge (CIE)Flashcards14. Coordination & Control14.4 Homeostasis

Exam code: 5090

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Define homeostasis.
The maintenance of a constant internal environment.
Define negative feedback.
A mechanism that reverses a change away from the set point to return conditions to normal.
Why is homeostasis important for the body?
It keeps internal conditions within set limits so that reactions in cells can work and the organism can live.
Give three internal conditions controlled by homeostasis.
Examples include:
- temperature
- blood glucose concentration
- water concentration
In negative feedback, what happens if the level of something rises too high?
Control systems are switched on to reduce it back to the set point.
In negative feedback, what happens if the level of something falls too low?
Control systems are switched on to raise it back to the set point.
Homeostasis is the maintenance of a constant environment.
Homeostasis is the maintenance of a constant internal environment.
Negative feedback keeps internal conditions within a narrow range of the point.
Negative feedback keeps internal conditions within a narrow range of the set point.
True or False?
Homeostasis keeps internal conditions within set limits.
True.
It maintains a constant internal environment so that cell reactions can function properly.
True or False?
In negative feedback, a rise in a condition makes the body increase it further.
False.
In negative feedback a rise switches on systems that reduce it, returning it to the set point.

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