Which of the following bones in the face are the only ones that aren't a pair of bones?
Zygomatic and nasal
Mandible and maxilla
Mandible and vomer
Lacrimal and maxilla
Palatine and vomer
The Correct Answer is C
Choice A reason: Both the zygomatic and nasal bones are paired. Each side of the face has one zygomatic bone and one nasal bone, making them bilateral structures.
Choice B reason: The mandible is unpaired, but the maxilla is paired. Each side of the face has a maxillary bone, so this combination is not entirely correct.
Choice C reason: Mandible and vomer are the correct answer. Both are unpaired bones in the facial skeleton. The mandible forms the lower jaw, and the vomer forms part of the nasal septum. They are midline structures and exist as single bones.
Choice D reason: Both the lacrimal and maxilla are paired bones. Each orbit has a lacrimal bone, and each side of the face has a maxilla.
Choice E reason: The palatine bones are paired, while the vomer is unpaired. This combination is partially correct but not as accurate as choice C.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is E
Explanation
Choice A reason: Smooth muscle does contract in response to electrical signals, but the mechanism is more complex and often involves calcium influx through voltage-gated channels rather than a classic action potential as seen in skeletal muscle.
Choice B reason: Cardiac muscle cells typically have one or two centrally located nuclei, not many. This distinguishes them from skeletal muscle cells, which are multinucleated.
Choice C reason: Cardiac muscle cells are found exclusively in the heart, not in large blood vessels. Large vessels contain smooth muscle in their walls, not cardiac muscle.
Choice D reason: Smooth muscle cells lack T tubules. T tubules are found in skeletal and cardiac muscle cells and are involved in rapid transmission of action potentials.
Choice E reason: Skeletal muscle cells are long, cylindrical, and multinucleated. This is a defining feature of skeletal muscle tissue and makes this statement true.
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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