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B5 - Homeostasis and response - Coggle Diagram
B5 - Homeostasis and response
Homeostasis
maintained by homeostasis: body temperature
blood glucose level
water content
all your automatic control systems are made up of three main components which work together to maintain a steady condition
receptors (in nose, in eyes, etc)
coordination centres (brain, spinal cord, pancreas, etc.)
effectors (muscles, glands)
Homeostasis is the maintenance of a constant internal environment.
negative feedback
1)
level changes from optimum
2)
receptors deflect change
3)
co-ord centre recieves and processes the information and prepares a response
4)
effectors respond
5)
optimum level
The Brain
Made up of lots of interconnected neurones and is responsible for all of our complex behaviours and actions
The Nervous System
Sensory neurones
- The neurones that carry information as electrical impulses from the receptors to the CNS
Motor neurones
- The neurones that carry electrical impulses from the CNS to the effectors
CNS
- In vertebrates the central nervous system consists of the brain and spinal cord only. It's connected to the body by sensory neurones and motor neurones.
Effectors
- All your muscles and glands, which respond to nervous impulses
The nervous means that humans can react to their surroundings and coordinate their behaviour
Stimulus > Receptor > Sensory neurone > CNS > Motor neurone > Effector > Response
Synapses and reflexes
the nerve signal is transferred by chemicals which is diffused across the gap
if you get a shock your body automatically releases adrenaline it doesn't wait for you to decide if you're shocked
the connection between two neurones is called a synapse
these chemicals set off a new electrical signal in the next neurone
Reflexes are rapid, automatic responses to certain stimuli that don't involve the conscious part of the brain