Homeostasis FSc Biology Notes Part 2 Chapter 15 pdf download google drive

How does homeostasis work?

key points. Homeostasis has a tendency to resist change to maintain a stable, relatively constant internal environment. Homeostasis usually involves negative feedback loops that prevent changes in various properties from their target values, known as set points.

Homeostasis FSc Biology Notes

The maintenance of a permanent internal environment by an organism is called homeostasis. Or the ability of an organism to maintain or close its internal physical condition is called homeostasis. Homeostasis means “stable state” or “uniformity”. According to Claude Bernard, living organisms face two environments.
Homeostasis FSc Biology Notes
Homeostasis FSc Biology Notes
  • External environment: which surrounds organisms.
  • Internal environment: Most tissue fluid where cells live.
There are constant fluctuations in the external environment. But organisms resist external changes by adjusting to the internal environment. The main organs of homeostasis are the lungs, skin, liver, and kidneys. Biologists make these adjustments with the help of various control systems. Substances that must be kept in the body permanently are salt, water, temperature, and elimination of toxic wastes.
Because external climate change can affect these substances. Homeostasis protects organisms from damage caused by changes in the external environment.

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