File is attached for the Answer
Reflex action is the response to a stimulus. The spinal cord along with the brain stem is responsible for the reflex movement.
For example : when you touch a hot object you immediately remove your hand from it
<span>The correct answer is cGMP.</span>
<span>cGMP, during the dark (when there are no stimulations of photoreceptor cells), reaches high intracellular levels. When the light stimulation occurs cGMP levels decrease because it is converted to GMP by phosphodiesterase. Phosphodiesterase is activated by transducin which is activated by excited rhodopsin (contains photopigment).</span>
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Low levels of cGMP block the cGMP gated ion channels and that prevents the entry of Na and Ca. Because of that membranes becomes more negative, hyperpolarization occurs and this creates a signal for the next cell.</span>
Answer:
<em>A. Chromosomes are strands of DNA, tightly wrapped up, that are located in the nucleus.</em>
Explanation:
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