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drahmed103
10-19-2005, 10:02 PM
Choose best choice or choices :

In the visual cortex ,responses of single neurones evoked by retinal stimuli:

(1) may be maximal for a border oriented in a particular direction .

(2) would reflect just the activity of rod pathways .

(3) would occur only when stimuli appeat in a circumscribed area within the visual field .

(4) are produced by activity originating in only one retina .

answer is 1 & 3 ,please explain ?

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The musculature of the cardinal (proximal) stomach :

(1) relaxes during each swallow

(2) contracts in a peristaltic manner in cordination with the caudal (distal) stomach during emptying of a meal .

(3) becomes more distensible when CCK increases in blood .

(4) exhibits contractions and relaxations that can not be altered by vagotomy .

answer is 1 & 3 ,why 2 is false ?

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Cortical evoked potentials :

(1) represent summed action and synaptic potentials of cortical and subcortical neurons .

(2) can be produced by electrical stimulation of the median nerve .

(3) help monitor brain stem as well as cortical auditory function .

(4) can be recorded in a comatosed patient .

answer is all are true ,why 2 & 4 are correct

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