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Part of the retina of a young rat was removed and kept in the dark for two hours. This allowed the pigment in the rod cells to recover from bleaching caused by exposure to light. Suggest what happens in the rod cells during this two hours of darkness.

Rhodopsin is the pigment found in rod cells, which consists of cis-retinal and the protein opsin. When the rod cells are kept in darkness, the opsin is uncoupled from the cell surface membrane of the rod cel...
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Answered by Panos L. • Biology tutor
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Explain how the sinoatrial node (SAN) ensures that oxygenated blood enters the aorta.

The sinoatrial node is a region found on the right atrium which acts as a pacemaker. Cells at the SAN can depolarise (become more positively charged with respect to the outside) and generate electrical activ...
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Answered by Panos L. • Biology tutor
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Prove that sin(x)+sin(y)=2sin((x+y)/2)cos((x-y)/2)

We know that 1. sin(a+b) = sin(a)cos(b)+sin(b)cos(a) and 2. sin(a-b) = sin(a)cos(b)-sin(b)cos(a) Add equations 1. and 2. sin(a+b)+sin(a-b) = 2sin(a)cos(b)+sin(b)cos(a)-sin(b)cos(a) = 2sin(a)cos(b) Let x=a+b ...
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Answered by Anna V. • Maths tutor
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From your work experience what have you learnt about the realities of being a doctor?

From the work experience that I have undertaken I have learnt more about the day to day realities of life as a doctor. I have learnt that being a doctor requires good communication and team working skills. T...
SM
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What is the effect of the first sentence of "Pride and Prejudice" and how would it change if "must be in want" would be substituted for "must want"?

"It is a truth universally acknowledged, that a single man in possession of a good fortune, must be in want of a wife." The sentence introduces one of the main themes of the plot, the pursuit of ri...
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