14.4 receptors Flashcards

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1
Q

list the 2 features of sensory receptors.

A

1- specific to 1 type of stimulus
2- produces generator potential by transducing

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2
Q

what happens when a pacinian corpuscle is applied with pressure? (3)

A

1- pacinian corpuscle is deformed & membrane around is stretch
2- Na+ diffuses into membrane which is depolarised
3- generator potential produces action potential & is passed along neurone

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3
Q

what is deformed when a pacinian corpuscle is pressurised?

A

stretch-mediated Na+ channels

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4
Q

what are the 2 types of receptors in the eye?

A

rod & cone cells

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5
Q

how do receptors in the eye work as tranducers?

A

transduces light energy to electrical energy of nerve impulse

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6
Q

which receptor detects low intensity light?

A

rods

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7
Q

why are many rod cells connected to 1 bipolar cell? what are the advantages & disadvantages of it?

A
  • threshold value could be reached more easily
  • only 1 impulse is sent upon stimulation of many rod cells -> low visual acuity
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8
Q

where are rod cells located?

A

periphery of retina & absent at fovea

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9
Q

where are cone cells located?

A

concentrated at fovea & less at periphery

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10
Q

how does visual receptors detects stimulus in the eye?

A

iodopsin / rodopsin are broken doen by light & change is detected by chemoreceptors

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11
Q

why are there 3 types of iodopsin?

A

different wavelengths of light

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