What motion is being used when you stand on your tiptoes to grab something off of the top shelf?
Inversion
Plantar flexion
Eversion
Dorsiflexion
Supination
The Correct Answer is B
Choice A reason: Inversion refers to turning the sole of the foot inward, toward the midline. It is a side-to-side movement at the ankle and does not elevate the heel or involve tiptoe posture.
Choice B reason: Plantar flexion is the correct answer. It involves pointing the toes downward and lifting the heel off the ground, which is exactly the motion used when standing on tiptoes. This movement occurs at the ankle joint and is essential for actions like walking, jumping, and reaching upward.
Choice C reason: Eversion is the opposite of inversion and involves turning the sole of the foot outward. Like inversion, it is a lateral movement and unrelated to tiptoe posture.
Choice D reason: Dorsiflexion is the opposite of plantar flexion. It involves lifting the toes upward toward the shin, such as when walking on heels. It does not help in reaching upward.
Choice E reason: Supination refers to rotating the forearm so the palm faces upward or forward. It is unrelated to foot movement or standing on tiptoes.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A reason: Myofilaments are the smallest contractile units within myofibrils, composed of actin and myosin. They do not represent bundles of muscle fibers.
Choice B reason: Fascicle is the correct term for a bundle of muscle fibers. Each fascicle is surrounded by perimysium and contains multiple muscle cells.
Choice C reason: Myofibrils are microscopic structures within individual muscle cells that contain the contractile machinery. They are not bundles of muscle fibers.
Choice D reason: Whole muscle refers to the entire organ composed of multiple fascicles, connective tissues, blood vessels, and nerves. It is a larger structure than a bundle of muscle fibers.
Correct Answer is A
Explanation
Choice A reason: The sarcomere is the smallest contractile unit of a skeletal muscle. It is composed of actin and myosin filaments arranged in a precise pattern that allows for muscle contraction. Sarcomeres are repeated along the length of a myofibril and are responsible for the striated appearance of skeletal muscle.
Choice B reason: The sarcoplasmic reticulum is a specialized form of endoplasmic reticulum in muscle cells that stores and releases calcium ions, which are essential for muscle contraction. However, it is not the contractile unit itself.
Choice C reason: The sarcolemma is the plasma membrane of a muscle fiber. It plays a role in conducting electrical signals but is not the structural unit responsible for contraction.
Choice D reason: A myofibril is a long, cylindrical organelle found within muscle cells that contains many sarcomeres. While it contributes to muscle contraction, it is composed of multiple sarcomeres and is not the fundamental unit.
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