Light Transduction + Receptive Field

12 Questions | By Tseemore | Last updated: Mar 21, 2022 | Total Attempts: 73

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P. 159-162

Questions and Answers

1.

What is Hartline's definition of a receptive field?
2.

What makes photoreceptors unique?
- A.
  
  Only have membrane potential changes
- B.
  
  Hyperpolarize when excited
- C.
  
  Decrease NT release when excited
- D.
  
  2 of the above
- E.
  
  All of the above
3.

Rods follow the stimulus change closely, whereas cones have a latency in their response.
- A.
  
  True
- B.
  
  False
4.

In the dark, Na channels are closed, preventing Na to enter the OS.
- A.
  
  True
- B.
  
  False
5.

In the dark, photoreceptors release NTs continuously
- A.
  
  True
- B.
  
  False
6.

As part of the dark current, Na is continuously pumped out of the OS and follows it's concentration gradient and enters the photoreceptor in the IS
- A.
  
  True
- B.
  
  False
7.

What is the voltage potential inside a photoreceptor in the dark? What is it in presence of light?
- A.
  
  -60mV; -20mV
- B.
  
  -20mV; -50mV
- C.
  
  -20mV; -60mV
- D.
  
  -50mV; -20mV
8.

When a photon of light strikes Rhodopsin, phosphodiesterase (PDE) becomes:
- A.
  
  Active
- B.
  
  Inactive
9.

Active PDE results DIRECTLY in conversion of:
- A.
  
  GMP --> cGMP
- B.
  
  Rho -->ospin + all trans retinal
- C.
  
  CGMP --> GMP
- D.
  
  Rho --> active Rho
10.

What is the purpose of cGMP in photorecptors?
- A.
  
  Closes Na channels
- B.
  
  Keeps Na channels open
- C.
  
  Inhibits PDE
- D.
  
  Regenerates Rho
11.

Light needs to be present during the entire time that Rho is being transformed into opsin and all-trans retinal
- A.
  
  True
- B.
  
  False
12.

The definition of a receptive field is only applied to ganglion cells.
- A.
  
  True
- B.
  
  False

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