Opposition is the movement of any bone in the body that opposes another bone in the body.
True
False
Only in the lower limbs
Only in the spine
The Correct Answer is A
Choice A reason: Opposition is a specific movement that occurs primarily in the thumb. It refers to the ability of the thumb to touch the tips of the other fingers, allowing grasping and manipulation. This movement involves the thumb opposing the fingers, hence the term.
Choice B reason: False is incorrect because opposition is a well-defined movement in anatomy, particularly in the hand.
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Related Questions
Correct Answer is C
Explanation
Choice A reason: This is incorrect. Tropomyosin does not block myosin; it blocks the active sites on actin filaments, preventing myosin binding until calcium binds to troponin.
Choice B reason: Tropomyosin is not a chemical activator. Activation of myosin heads occurs through ATP hydrolysis and calcium-mediated exposure of actin binding sites.
Choice C reason: This is correct. Tropomyosin is a regulatory protein that wraps around actin filaments and blocks myosin-binding sites. When calcium binds to troponin, tropomyosin shifts, exposing these sites and allowing contraction to proceed.
Choice D reason: Tropomyosin does not function in the synaptic cleft nor inhibit calcium there. Calcium regulation in the synaptic cleft involves neurotransmitter release mechanisms, not tropomyosin.
Choice E reason: Tropomyosin is not a receptor. The receptor for motor neuron neurotransmitters (e.g., acetylcholine) is the nicotinic acetylcholine receptor located on the sarcolemma of the muscle cell.
Correct Answer is A
Explanation
Choice A reason: Scoliosis is the correct answer. It is characterized by a lateral curvature of the spine, often diagnosed in adolescence. It can range from mild to severe and may require bracing or surgery depending on progression.
Choice B reason: Lordosis refers to an exaggerated inward curvature of the lumbar spine. It is a spinal deformity but not the most common.
Choice C reason: Kyphosis is an exaggerated outward curvature of the thoracic spine, leading to a hunched posture. It is less common than scoliosis.
Choice D reason: Osteosis is not a recognized spinal deformity. It may be a misused or fictional term.
Choice E reason: A slipped disc, or herniated disc, involves displacement of intervertebral disc material. It causes pain and nerve compression but is not classified as a spinal deformity.
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