Coordination and Response Flashcards
Stimulus is ?
A change in an animals surroundings
Response is ?
A reaction to the change
Receptor Organ
Are organs that detect the change
Effector
Organs that bring about the response
Stimulus —> ________ —> Coordination —> _________ —> Response
Stimulus —> Receptor —> Coordination —> Effector —> Response
The role of the receptor is?
To detect the stimulus
Define Homeostasis
Maintaining a constant internal environment despite external change
State three conditions which need to be controlled within the body
- Temperature
- Water Levels
- Blood glucose concentration
What are the three main parts to a coordinated response?
- A stimulus ( e.g temperature change)
- A receptor ( to detect the change)
- An effector ( to carry out the response)
What does auxin trigger
Auxin triggers growth of the main stem of the plant
What is phototropism and which part of a plant is positively phototrophic
Phototropism is the growth of a plant towards a light source. The shoots are positively phototrophic (they grow towards the light source
What is geotropism and which part of a plant is positively geotropic?
Geotropism is the growth of a plant towards the pull of gravity. The roots are positively geotropic (they grow down in the same direction as the pull of gravity).
Give 3 differences between nervous and hormonal communication
- Nervous communication uses nerve cells and impulses whereas hormones are secreted by glands and travel in the blood
- Nervous communication is generally much faster than hormonal communication
- Hormonal communication usually brings about longer lasting responses than nervous communication
What is the difference between the central nervous system and the peripheral nervous system
The central nervous system is the brain and the spinal cord. The peripheral nervous system is every other part of the nervous system
How is an impulse transmitted between two neurones
- The impulse reaches the end of one neurone
- A neurotransmitter is released and it diffuses across the gap
- A new impulse is triggered in the next neurone