Biology Unit 5: Grey Matter Quiz on Topic 8 of A2 Biology. 3.5 / 5 based on 2 ratings ? BiologyA2/A-levelEdexcel Created by: Niki :)Created on: 16-04-13 13:07 Name the visual pigment present in cones. iodopsin 1 of 11 In saltatory conduction, action potentials take place at the... Nodes of Ranvier. 2 of 11 In the resting potential, there is an overall movement of potassium ions out of the axon because the concentration gradient is greater than the electrochemical gradient. 3 of 11 What is the function of the optic nerve? It carries impulses from the retina to the brain. 4 of 11 The period in which the sodium ion channels are completely blocked ad the resting potential is not restored is known as.... absolute refractory period 5 of 11 What is the difference between primary and secondary receptors? Secondary receptors have specialised cells. 6 of 11 What is an excitatory post-synaptic potential (EPSP)? Neurotransmitters open sodium channels in the postsynaptic membrane causing an inflow of Na+ ions and depolarisation of the membrane. 7 of 11 How does the iris respond to dim light? The circular muscles relax and the radial muscles contract. 8 of 11 What is temporal summation? One action potential arrives at the synapse and makes it easier for the next impulse to set up another action potential. 9 of 11 What is the method of microprojectiles? DNA is shot into the cell at high speed carried on gold or tungsten pellets. 10 of 11 MRI scans are more beneficial than CT scans because they... don’t involve radiation. 11 of 11
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