5.3.2 Mammalian Sensory Receptors Flashcards
1
Q
What are receptors
A
Cells responding to stimulus.
Transducers, converting energy from one form (light, heat or sound) to energy in the form of an electrical impulse
2
Q
Receptors all over the body diagram
A
3
Q
What are the types of receptors and what do they do?
A
Photoreceptors - light
Chemoreceptors - chemicals
Mechanoreceptors - mechanical strain or stretching
Baroreceptors - Blood pressure
Osmoreceptors - Body fluids
4
Q
What are Pacinian corpuscles?
A
- Type of mechanoreceptor deep in skin
- In fingers, soles of feet, joints, tendons, ligaments
- Respond to changes in pressure
- When stimulated, generator potential is established
- Found at ends of sensory neurone axons
- Made of many layers of membrane around end of neurone separated by a gel containing Na+ ions
- This section of axon surrounded by these layers of membrane contain stretch mediated Na+ channels opening when sufficient pressure is applied
- Allows Na+ to flow into neurone to establish generator potential (by providing electrical potential difference across axon membrane)
5
Q
What is a generator potential
A
Nervous impulse produced by a sensory receptor following transduction of one form of energy into electrical energy
