Bending your head backward past the point of anatomical position is called:
Circumduction
Rotation
Hyperextension
Flexion
The Correct Answer is C
Choice A reason: Circumduction is a circular movement that combines flexion, extension, abduction, and adduction. It is typically seen in ball-and-socket joints like the shoulder or hip, not in the neck. It does not describe the backward bending of the head.
Choice B reason: Rotation refers to the movement of a bone around its longitudinal axis, such as turning the head side to side. It does not involve bending the head backward.
Choice C reason: Hyperextension occurs when a joint is extended beyond its normal anatomical position. In the case of the head, bending it backward past the neutral anatomical position is a classic example of hyperextension.
Choice D reason: Flexion is the movement that decreases the angle between two body parts, such as bending the head forward toward the chest. It is the opposite of the movement described in the question.
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Related Questions
Correct Answer is C
Explanation
Choice A reason: A meatus is a canal-like passageway through bone, such as the external auditory meatus in the skull. It does not describe a rounded projection.
Choice B reason: A foramen is a hole or opening in a bone that allows the passage of nerves and blood vessels. It is not a projection.
Choice C reason: A condyle is a rounded articular projection that typically forms part of a joint. It allows for smooth articulation with another bone, making it the correct answer.
Choice D reason: A fossa is a shallow depression in a bone, often serving as an articular surface or for muscle attachment. It is not a projection.
Correct Answer is A
Explanation
Choice A reason: Myosin heads pulling actin toward the center of the sarcomere is the core mechanism of cross-bridge cycling. This interaction shortens the sarcomere and generates muscle contraction. ATP binding and hydrolysis drive the cycle of attachment, power stroke, and detachment.
Choice B reason: Thick filaments do not shorten during contraction. Instead, thin filaments slide past the thick filaments as the sarcomere shortens. The filaments themselves remain the same length.
Choice C reason: Actin and myosin do not lengthen during contraction. They maintain their structural integrity while sliding past each other through repeated cross-bridge interactions.
Choice D reason: Z discs define the boundaries of a sarcomere and move closer together during contraction, but they do not slide over myofilaments. Their movement is a result of filament sliding, not a direct action.
Choice E reason: Titin is a structural protein that contributes to passive elasticity and sarcomere stability. It does not actively shorten or participate in the cross-bridge cycle
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