Topic 5 - Homeostasis Flashcards
Your automatic control systems keep your internal environment stable using a mechanism called?
Negative feedback
When the level of something gets too high or low what does your body use to bring level back to normal?
Negative feedback
What do receptors do?
Detect a stimulus
What organises a response after stimulus is detected?
Coordination centre
What does the effector do?
Produces a response and restores optimum level
What do sensory neurones do?
Carry info as electrical impulses from receptors to CNS
What’s the CNS made up of and connected with?
Brain and spinal cord connected by sensory and motor neurones
What do motor neurones do?
Carry electrical impulses from CNS to effectors
What are effectors?
All your muscles and glands which respond to nervous impulses
Describe the order the CNS coordinates a response
Stimulus
Receptor
Sensory neurone
CNS
Motor neurone
Effector
Response
What’s the connection between two neurones called?
A synapse
What are reflexes?
Rapid, automatic responses to certain stimuli that don’t involve the conscious part of the brain
What’s the passage of information in a reflex (from receptor to effector) called?
A reflex arc
What are 2 types of effectors and what do they do?
Glands - release hormones
Muscles - comtract
What is the role of a relay neurone?
To transfer a signal from a sensory neurone to a motor neurone
Which light-sensitive cells in the retina enable you to see in colour?
Cone cells
(You can think of it as ‘C for Colour’ and ‘C for Cone cells’)
What is the cornea?
A transparent layer at the front of the eye which refracts light
What is the pupil?
The gap through which light passes to reach the lens
What are the names of the two types of receptor cells in the retina?
Cone cells
Rod cells
