Light Transduction + Receptive Field
12 Questions
| Total Attempts: 69
P. 159-162
Questions and Answers
- 1.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
- 2.Rods follow the stimulus change closely, whereas cones have a latency in their response.
- A.
True
- B.
False
- 3.In the dark, Na channels are closed, preventing Na to enter the OS.
- A.
True
- B.
False
- 4.In the dark, photoreceptors release NTs continuously
- A.
True
- B.
False
- 5.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
- 6.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
- 7.When a photon of light strikes Rhodopsin, phosphodiesterase (PDE) becomes:
- A.
Active
- B.
Inactive
- 8.Active PDE results DIRECTLY in conversion of:
- A.
GMP --> cGMP
- B.
Rho -->ospin + all trans retinal
- C.
CGMP --> GMP
- D.
Rho --> active Rho
- 9.What is the purpose of cGMP in photorecptors?
- A.
Closes Na channels
- B.
Keeps Na channels open
- C.
Inhibits PDE
- D.
Regenerates Rho
- 10.Light needs to be present during the entire time that Rho is being transformed into opsin and all-trans retinal
- A.
True
- B.
False
- 11.What is Hartline's definition of a receptive field?
- 12.The definition of a receptive field is only applied to ganglion cells.
- A.
True
- B.
False
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