In the chemistry of vision in mammals, the photosensitive substance is called:
Correct answer: A. Rhodopsin
- A. Rhodopsin
- B. Melanin
- C. Sclerotin
- D. Retinol
Explanation
Rhodopsin is a light-sensitive pigment in the rod cells of the retina. It consists of opsin (protein) and retinal (vitamin A derivative), and helps vision in dim light by triggering nerve impulses when light is absorbed.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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