2.1 Responding to Change Flashcards
Where are the receptors found?
Sense organs
Name 5 sense organs
Eye, ear, tongue, skin, nose
What do your skin receptors react to?
Touch, pressure, temperature, pain
What do your tongue receptors react to?
Chemicals in food and drink
What do your nose receptors react to?
Chemicals in the air
What do your eye receptors react to?
Light
What do your ear receptors react to?
Sound, position of head
How does the brain react to stimulants?
Light stimulates receptors in your eye and electrical impulses then pass to the brain song neurons
What are neurons?
Nerve cells
What stimuli are detected by the sense organs?
Light, chemical, touch, pain, temperature, sound etc
What two components form the central nervous system (CNS)?
The brain and the spinal cord
What do sensory neurones do?
Carry impulses from receptors to the CNS
Where are neurones found?
In our nerves
What do motor neurones do?
Carry impulses from the CNS to effector organs
What are effector organs?
Muscles or glands that change due to the stimuli detected by the receptors
How do muscles respond as effector organs?
They contract
How do glands respond as effector organs?
The secrete (release) chemicals
How do impulses pass from the receptor to the effector organs?
- Receptor detects stimuli
- Electrical impulses pass from receptor to CNS via sensory neurones
- Electrical impulses pass from CNS to effector organs via motor neurones
What does the nervous system allow humans to do?
React to their surroundings and coordinates behaviour
What do receptors detect?
External stimuli
What part of the nervous system detects stimuli?
Receptors
