Nursing practice questions with comprehensive rationales
NurseDive Free Nursing Practice Question
Which of the following bones in the face are the only ones that aren't a pair of bones?
A. Zygomatic and nasal
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.
B. Mandible and maxilla
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.
C. Mandible and vomer
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.
D. Lacrimal and maxilla
Both the lacrimal and maxilla are paired bones. Each orbit has a lacrimal bone, and each side of the face has a maxilla.
E. Palatine and vomer
The palatine bones are paired, while the vomer is unpaired. This combination is partially correct but not as accurate as choice C.
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Full Explanation
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.
Similar Questions
Connective tissue sacs lined with synovial membrane that act as cushions in places where friction develops are called:
A. Tendons
Tendons connect muscles to bones and transmit force during contraction. They do not act as cushions or reduce friction.
B. Bursae
Bursae are the correct answer. These are small fluid-filled sacs lined with synovial membrane that reduce friction between moving structures such as tendons and bones or skin and bones. They are commonly found near joints like the shoulder, elbow, and knee.
C. Menisci
Menisci are fibrocartilaginous pads found in certain joints like the knee. They help distribute weight and improve joint stability but are not fluid-filled sacs.
D. Joint cavities
Joint cavities are spaces within synovial joints that contain synovial fluid. While they allow movement, they are not separate cushioning structures like bursae.
E. Ligaments
Ligaments connect bones to other bones and stabilize joints. They do not serve as cushions or reduce friction.
Full Explanation
Choice A reason: Tendons connect muscles to bones and transmit force during contraction. They do not act as cushions or reduce friction.
Choice B reason: Bursae are the correct answer. These are small fluid-filled sacs lined with synovial membrane that reduce friction between moving structures such as tendons and bones or skin and bones. They are commonly found near joints like the shoulder, elbow, and knee.
Choice C reason: Menisci are fibrocartilaginous pads found in certain joints like the knee. They help distribute weight and improve joint stability but are not fluid-filled sacs.
Choice D reason: Joint cavities are spaces within synovial joints that contain synovial fluid. While they allow movement, they are not separate cushioning structures like bursae.
Choice E reason: Ligaments connect bones to other bones and stabilize joints. They do not serve as cushions or reduce friction.
The cross-bridge cycling involves:
A. Myosin heads pulling actin toward the middle
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.
B. The shortening of thick filaments so that thin filaments slide past
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.
C. Actin and myosin lengthening in order to slide past each other
Actin and myosin do not lengthen during contraction. They maintain their structural integrity while sliding past each other through repeated cross-bridge interactions.
D. The Z discs sliding over the myofilaments
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.
E. The protein titin shortening the myosin filament
Full 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
A fracture in the shaft of a bone would be a break in the:
A. Metaphysis
The metaphysis is the region between the diaphysis and epiphysis, often containing the growth plate in children. It is not the shaft of the bone.
B. Epiphysis
The epiphysis refers to the ends of long bones, which articulate with adjacent bones. A fracture here would not be considered a shaft fracture.
C. Diaphysis
The diaphysis is the correct answer. It is the central shaft of a long bone, composed primarily of compact bone and housing the medullary cavity. Fractures in this region are common in long bones like the femur and humerus.
D. Periosteum
The periosteum is a fibrous membrane covering the outer surface of bones. While it may be affected in a fracture, it is not the structural region referred to as the shaft.
E. Endosteum
The endosteum lines the inner surface of the bone, including the medullary cavity. It plays a role in bone remodeling but is not the shaft itself
Full Explanation
Choice A reason: The metaphysis is the region between the diaphysis and epiphysis, often containing the growth plate in children. It is not the shaft of the bone.
Choice B reason: The epiphysis refers to the ends of long bones, which articulate with adjacent bones. A fracture here would not be considered a shaft fracture.
Choice C reason: The diaphysis is the correct answer. It is the central shaft of a long bone, composed primarily of compact bone and housing the medullary cavity. Fractures in this region are common in long bones like the femur and humerus.
Choice D reason: The periosteum is a fibrous membrane covering the outer surface of bones. While it may be affected in a fracture, it is not the structural region referred to as the shaft.
Choice E reason: The endosteum lines the inner surface of the bone, including the medullary cavity. It plays a role in bone remodeling but is not the shaft itself