the fact that rod functioning predominates during dark adaptation, therefore poor acuity
Explanation:
Rods and cones are the photoreceptor cells present in the eye that perform the function of converting the light received into signals that stimulate the biological processes.
Out of the rods and cones, the rods are more sensitive and they are so sensitive that they can be activated even under low light conditions.
However the cones can be stimulated only under bright light conditions, but the visual acuity is higher for the cones as compared to the rods.
<em>Therefore under conditions of dim light, the rods are activated and hence it results in a poor visual acuity and a person experiences difficulty in reading. </em>
The sympathetic nervous system originates in the spinal cord and its main function is to activate the physiological changes that occur during the fight-or-flight response. This component of the autonomic nervous system utilises and activates the release of norepinephrine in the reaction.
