Which of the following movements does NOT increase or decrease the angle between bones?
Abduction
Flexion
Rotation
Adduction
Circumduction
The Correct Answer is C
Choice A reason: Abduction is the movement of a limb away from the midline of the body, which increases the angle between the limb and the trunk.
Choice B reason: Flexion decreases the angle between two bones, such as bending the elbow or knee.
Choice C reason: Rotation involves turning a bone around its longitudinal axis, such as turning the head side to side. It does not change the angle between bones, making it the correct answer.
Choice D reason: Adduction is the movement of a limb toward the midline of the body, decreasing the angle between the limb and the trunk.
Choice E reason: Circumduction is a circular movement that combines flexion, extension, abduction, and adduction. It involves changes in angles between bones throughout the motion.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
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 C
Explanation
Choice A reason: Supraspinatus is one of the four rotator cuff muscles. It originates from the supraspinous fossa of the scapula and inserts on the greater tubercle of the humerus, aiding in shoulder abduction and stabilization.
Choice B reason: Infraspinatus is a rotator cuff muscle that originates from the infraspinous fossa of the scapula and inserts on the greater tubercle of the humerus. It functions in external rotation of the shoulder.
Choice C reason: Rhomboid minor is not part of the rotator cuff. It is located in the upper back and functions to retract the scapula. It does not attach to the humerus or contribute to shoulder joint stabilization.
Choice D reason: Teres minor is a rotator cuff muscle that originates from the lateral border of the scapula and inserts on the greater tubercle of the humerus. It assists in external rotation and stabilization of the shoulder.
Choice E reason: Subscapularis is the fourth rotator cuff muscle. It originates from the subscapular fossa and inserts on the lesser tubercle of the humerus, functioning in internal rotation of the shoulder.
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