Receptors examples
- Created by: Katie Noble
- Created on: 06-04-13 17:39
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Chemoreceptors
Found in wall of carotid arteries and aorta
- Chemoreceptors detect pH changes in blood
- CO2 is acidic
Increased frequency of nervous impulses to the medulla oblongata
So.. increased frequency of impulses (via sympathetic nervous system) to SAN... Increased heart rate!
Increased blood flow = more CO2 removed = normal level of CO2 again
Pressure Receptors
Blood pressure is higher than normal:
- Nervous impulses sent to centre in medulla oblongata that decreases heart rate
- Medulla oblongata sends nervous impulses (via parasympathetic nervous system) to SAN in heart
- Heart rate slows
Blood pressure lower than normal:
- Nervous impulses to centre in medulla oblongata; impulses through sympathetic nervous system to SAN and increased heart rate.
Receptors
Sensory receptors:
- Are specific to one type of stimulus
- Produce a generator potential by acting as a transducer
- A transducer converts information provided by stimulus into a form that the body can recognise; the mechanical energy (eg) into a nervous impulse -the generator potential
The Pacinian Corpuscle
Found deep in the skin - mainly in fingers, soles of feet, joints, external genitalia, ligaments and tendons
The single sensory neurone is a naked (non-myelinated) nerve ending and is at the centre of many layers of…
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