☀️Homeostasis Flashcards
Homeostasis
The ability of an organism to maintain a constant internal environment
External environment
Surrounds the outside of an organism
Internal environment
Surrounds the cells of an organism
Examples of homeostasis
- Maintains body temp very close to 37 degrees Celsius
- prevents build up of toxic chemicals in the body
- maintains sufficient levels of oxygen in the body
What does the liver and kidneys control
Prevention of the buildup of toxic wastes
How do cells exchange their materials
With their environment by diffusion, osmosis and active transport
What are specials organs of exchange not needed for
Small organisms because diffusion is adequate
How to improve the rate of exchange
Large organisms require these features
Flat surface
A respiratory system with a large surface
Respiratory and excretory systems which take materials from within the body to the body surface
Improving homeostasis
The organ/ organism may be flattened (leaves of a plant)
This reduces distance between two surfaces and allows sufficient materials to be exchanged by diffusion
What does human temp falls by at night
1 dégrées C
Human body temperature rises when
We get an infection (fever)
Internal environment of body changes due to hormonal changes during
Menstrual cycle
Puberty
Menopause
Why do large organisms need a circulatory system
To carry materials over long distances
Homeostasis allows
- Cells + organisms to function at their most efficient rate
- Organisms to function independently of external conditions
- Flight change in internal conditions when necessary
How does homeostasis allow organisms to function efficiently
Controls the environment surrounding the cells, allowing the cells to maintain constant conditions
