Researchers Who Have Studied Colour Blindness and Colour Deficiency Have

question 156

Multiple Choice

Researchers who have studied colour blindness and colour deficiency have found that:

• A) total colour blindness is extremely rare in animal species.
• B) total colour blindness in humans usually occurs when cones of the retina are absent or malfunctional.
• C) blue-yellow colour blindness is the most common form of colour deficiency.
• D) colour deficiency is more frequently found in women than in men.

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Definitions:

Glycine

An amino acid neurotransmitter in the central nervous system that primarily inhibits or decreases the activity of neurons.

Renshaw Loop

A neurological feedback circuit within the spinal cord involving Renshaw cells that helps modulate motor neuron activity.

Interneuron

Association cell interposed between a sensory neuron and a motor neuron; in mammals, interneurons constitute most of the brain’s neurons.

Motor Neuron

Cell that carries efferent information from the brain and spinal cord to make muscles contract.