Topic 5- Homeostasis & Response

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Why do internal conditions of your body need to be regulated?
To maintain the right conditions for cells to function properly and for enzyme action
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Name the component of a conrol system that detects a stimuli?
Receptor
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Give a definition of homeostasis
regulation of the internal conditions inside body to maintain a stable internal environment in response to internal and external changes
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Give 3 automatic control systems the the body
1. body temp 2. blood glucose level 3. water content
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What are the 3 main components that automatic control systems are made up of
receptor, coordinations centres and effectors
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Give 3 examples of something that is in a coordination centres
brain, spinal cord, pancreas
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What is negative feedback?
The process the body uses when the level of something in the body is too high or low to return it back to normal
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What does the receptor do in the process of negative feedback?
detects a stimuli
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What does the coordination centre do in negative feedback?
recieves and processes the information and then organises a response
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What does the effector do in negative feedback?
produces a response, counteracts the change and restores the optimum level
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What are stimuli?
Changes in the environment
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In vertebrates, what does the CNS consist of?
brain and spinal cord
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What does CNS stand for?
Central Nervous system
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How is the CNS connected to the rest of the body?
by sensory and motor neurones
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What are sensory neurones?
neurones that carry info as electrical impulses from receptor to CNS
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What are motor neurones?
neurones that carry electrical impulses from CNS to effectors
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What are effectors?
All muscles and glands that respond to nervous impulses
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What do muscles do n repsonse to nervous impulses?
contract
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What do glands do in response to nervous impulses?
secrete hormones
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Give 2 types of effectors
muscles and glands
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What is a synapse?
The connection between 2 neurones
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How do synapses work?
Nerve signals, transferred by chemicals diffuse across gap (synapse), these chemicals set off new electrical signal in next neurone
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What are reflexes?
rapid/automatic responses to certain stimuli that dont involve conscious part of brain - can reduce risk of injury
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Give one example of how automatic responses can reduce the chance of injury
When light shines into the ye, the pupils get smaller automatically, reducing the amount of light entering the eye, so stopping damage
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What is a reflex arc?
passage of info in a reflex
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Give 2 advantages of using computers to calculate reaction time
1. gives more accurate data 2. harder to tell when stimulus will appear
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Why do computers give more precise and accurate results? 2 Ways
because they can do it to milliseconds and there are no human errors
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How is it harder to tell when the stimulus will happen on computers?
There is no body language for computers
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What is the brain in charge of?
comples behaviours and everything you do
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What are the 4 regions of the brain?
medulla, spinal cord, cerebellum, cerebreal cortex
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what does the medulla do?
controls unconscious activites e.g heartbeat and breathing
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what does the cerebellum do?
responsible for muscle coordination and balance
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What does the cerebral cortex do?
responsible for things such as language, intelligence, memory and consciousness
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What are 3 ways of studying the brain?
MRI Scans, looking at patients with brain damage, electrically stimulating the brain
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What do MRI Scans do?
give a detailed image of the brain and see which parts of the brain are active when listening to music or recalling memory
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How does looking at a damaged brain give scientists info?
Tells us what the damaged part does. E.g if damaged part at the back caused blindness, then the damaged part involved vision
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Name the region of the brain that controlls coordinated movement
cerebullum
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What are the 2 risks with investigating the brain?
causing physical damage and increasing problems with brain function
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What has an increased amount of knowledge about the brain led to?
Development of treatments for disorders of the nervous system
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Give an example of a treatment electrical stimulation has found
Electrical stimulation can help reduce muscle tremors caused by nervous sytem disorders
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Name a disorder caused by the nervous system
Parkinsons disease
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Card 2

Front

Name the component of a conrol system that detects a stimuli?

Back

Receptor

Card 3

Front

Give a definition of homeostasis

Back

Preview of the front of card 3

Card 4

Front

Give 3 automatic control systems the the body

Back

Preview of the front of card 4

Card 5

Front

What are the 3 main components that automatic control systems are made up of

Back

Preview of the front of card 5
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