3.1 & 3.2 Nervous Systems / Endocrine System Flashcards
What’s a stimulus?
Change in environment
What’re receptors?
Groups of cells that detect stimulus.
What’re effectors?
Muscles or glands that respond to stimulus
What do receptors detect?
They detect stimulus such as: light, chemical, pressure & heat.
What do receptor cells do to the stimulus?
They change stimulus to electrical impulses to CNS.
3 types of neurones?
- Sensory neurones
- Relay neurones
- Motor neurones
What’re sensory neurones?
Carry electrical impulses from receptor cells to CNS.
What’re relay neurones?
Carry electrical impulses through the CNS. Connect sensory neurones to motor neurones.
What’re motor neurones?
Carry electrical impulses from CNS to effectors.
Flow diagram of nervous reaction:
Stimulus -> Receptor cells -> Sensory neurone -> Spinal Cord -> Motor neurones -> Effectors -> Muscles -> Effect