Receptors

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What is the nervous system?
Enables us to react to our surroundings and coordinate our behaviour
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What is the nervous system made up of?
The brain, spinal cord and nerves
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What makes up the central nervous system (CNS)?
Brain and spinal cord
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What does the CNS coordinate?
Coordinates responses
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What do nerves make up?
The peripheral nervous system
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How does information travel to and from the brain and spinal cord?
Electrical impulses along nerves
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What are sense organs?
Enable us to detect changes in our surrounding. Sense organs have special cells called receptors that detect changes around us
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What is the sequence of events that happen to bring about a response to a change in our surrounds?
Stimulus Receptors. Sensory neurone. CNS. Motor neurone. Effector. Response
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What is a stimulus?
A change in our surroundings
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What is a receptor?
Cells which detect the changes in our surroundings
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What is a sensory neurone?
Nerve that carries impulses from sense organs to the central nervous system (CNS)
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What is the CNS?
Coordinates the response
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What is a motor neurone?
Nerve that carries messages to the effector
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What is a effector?
Muscles or glands which bring about an action
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What is a response?
The way in which you react I the stimulus
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What is the reflect arc?
A quick automatic response to a stimulus e.g. Sitting on a pin, touching a hot object. They protect us
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what is a synapse?
a gap between two nerves
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what is the steps of a synapse?
1)impulses get to the end of neurone 2)vesicles make chemical transmitters 3)chemicals diffuses across the gap 4)it starts off a new impulse in the next neurone
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what is homoeostasis?
the process by which internal environment inside our bodies is kept constant. This process involved your nervous system, your hormones and body organs.
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what internal conditions have to be kept constant (homoeostasis)?
ion levels, blood sugar levels and temperature
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how does our body control water and ions?
you take in water and minerals when you eat and drink. you lose water when you breathe out and in your sweat
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what controls the balance of water in our body?
the kidneys, if too much water moves into or out of your cells, they get damaged
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how does our body control temperature?
the skin controls our temperature by sweating to cool you down and shivering to warm you up
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how does out body control blood sugar?
you take in sugar into our body when you eat and drink. too much glucose in the blood can damage body cells. the concentration of glucose in your blood is kept constant by hormones made in the pancreas
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what do endocrine glands make and release?
hormones in our body
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what are hormones?
hormones are chemicals messages which control many of the processes going on inside our bodies
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why are hormones carried around the body?
to target organs in the blood stream
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what hormones does the pituitary gland make?
sex and growth hormones
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what hormones does the thyroid make?
thyroxine
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what hormones does the pancreas make?
insulin and glucagon
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what hormone does the adrenal make?
adrenaline
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what hormones does the ovaries make?
oestrogen
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Other cards in this set

Card 2

Front

What is the nervous system made up of?

Back

The brain, spinal cord and nerves

Card 3

Front

What makes up the central nervous system (CNS)?

Back

Preview of the front of card 3

Card 4

Front

What does the CNS coordinate?

Back

Preview of the front of card 4

Card 5

Front

What do nerves make up?

Back

Preview of the front of card 5
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