Color vision has much greater resolution than night vision (vision that is mostly in shades of gray). Which of the following is the best explanation for why this is so?
A) A single cone photoreceptor often connects to a single bipolar cell and a single ganglion cell while as many as 100 rods will converge to a single ganglion cell.
B) There are many more cone photoreceptors in the eye than rod photoreceptors.
C) There are several types of cone photoreceptors, each of which enrich the clarity and resolution of vision.
D) A larger proportion of the brain's visual cortex is active during the day when our cone photo receptors are most active.
A
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Which describes a covalent bond?
A. A bond between two free radicals B. The positive side of one molecule is attracted to the negative side of another C. A bond between water molecules D. Two atoms share electrons with each other from their outermost shell E. A bond between two oppositely charged ions
When tension output exceeds resistance and the muscle exerts a constant force as it changes length, the contraction is described as _________
Fill in the blank with correct word.
Preparing the body for the "fight-or-flight" response is the role of the ________.
A) sympathetic nervous system B) cerebrum C) parasympathetic nervous system D) somatic nervous system
Structure B is the joint between the ________ and ________ bones.
A) occipital; temporal
B) occipital; parietal
C) parietal; frontal
D) frontal; occipital
E) temporal; parietal