Lisachem Practice Exams

[Spreadbury]

I was doing a lisachem practice exams and I came across a couple of questions that I was unsure if the answer's were correct (the actual answers the exam provides)

They were the multiple choice questions and the were:
"the photoreceptors that are least sensitive to light are named:
A.Neurons
B.Cones
C.Rods
D.Retina" and the answer the exam stated for this question was Cones

"Shona is researching information regarding night terrors and nightmares for a Psychology project. She finds that night terrors occur in ______ stage of sleep with _______ movement, while nightmares occur in _______ stage of sleep with _______ movement
A.REM, violent, NREM, violent
B.NREM, violent, REM, little
C.NREM, little, REM, little
D.REM, little, NREM, little" and the answer the exam stated was B but the body is relaxed in NREM 3+4 which is when night terror's occur...

i'm wondering whether lisachem is trustable  

i'm just correcting a 3rd exams and it asks
"during which of the following would you expect the lowest EMG readings?
A.NREM 1
B.NREM 2
C.REM
D.a hypnagogic state" and the answer section states that the muscles are most relaxed in REM, but the grivas text book has stated that the muscles are in a state of paralysis in REM sleep...

ok this'll be my last modification to this post but if this isn't wrong I'm not sure I can really trust my text book:
                              Nightmares:                          Night Terrors:
EEG reading:             theta/delta                           beta
EOG reading:             slow eye rolling movements     rapid eye movements
stage (REM/NREM):    NREM stages 3 and 4              REM

[The Detective]

Rods should be the photoreceptor least sensitive to light. Probably a mistake.

About the other one... night terrors usually have movement I'm pretty sure ...

[Hongld]

For the first question like The Detective said, Rods is the answer.
Rods respond best to dark therefore it is least sensitive to light.

The rest I haven't done at school yet.

[Spreadbury]

thanks

[The Detective]

Same sort of thing, they are very relaxed almost like they are paralyzed. I don't think it should matter too much, but I don't think they are paralyzed in REM. 

[Hongld]

You know what, the Psychology Study card tells me that Cones are less sensitive to light

[Glockmeister]

My neuroscience textbook (Neuroscience: Exploring the Brain, by Bear, Connors and Paradiso) says that rods are more sensitive to light than cones. This is evident when at nighttime, where only rods are actually used to determine light.

Hope that helps

[Spreadbury]

My neuroscience textbook (Neuroscience: Exploring the Brain, by Bear, Connors and Paradiso) says that rods are more sensitive to light than cones. This is evident when at nighttime, where only rods are actually used to determine light.

Hope that helps

Yeah my friend explained that today  my bad (lol) thanks

[TrueLight]

yeah
im just going to copy this out from a notebook  (bad me)
-"Rods are more sensitive to light than cones because they contain more photopigment and because the light activated enzyme cascade is more efficient in rods than cones. However, this means that rods are almost totally non-functional in daylight (where the background light levels are high). Cones are less affected, also because they have an efficient light adaptation mechanism, so daylight viewing is dependent on cones. In the dark both rods and cones recover their sensitivity. Since rod sensitivity is greater than cone sensitivity, night vision (or rather vision when light levels are low) is dependent on rods."

[Slumdawg]

The answer is cones for the first one because rods are the most sensitive to light because they can pick up visual stimulus in areas of  low light. Therefore cones aren't as sensitive because they don't work well in low light conditions and can't fire off when there isn't enough light hence they are the LEAST sensitive to light.

Hope that helps.

[The Detective]

I don't think I learnt that.. but that does make more sense.
thanks shilayli06
I must have been thinking in terms of sensitivity to colour