13.1 Coordination Flashcards
1
Q
Give examples of 4 things that cause change in an organism’s internal environment.
A
- Blood glucose concentration
- Internal temperature
- Water potential
- Cell pH
2
Q
Give examples of 4 things that cause change in an organism’s external environment.
A
- Humidity
- External temperature
- Light intensity
- New or sudden sound
3
Q
How do animals respond to changes in their environments?
A
- Chemical responses, via hormones
* Electrical responses, via neurones
4
Q
How do plants respond to changes in their environment?
A
Chemical responses, including hormones
5
Q
Why is coordination needed?
A
Cells in organisms have become specialised as they’ve evolved, so they need to be coordinated to operate effectively
6
Q
Define homeostasis
A
Maintenance of a stable equilibrium in the internal environment of an organism
7
Q
How does cell signalling occur?
A
Occurs through one cell releasing a chemical which has an effect on another cell, known as a target cell
