The _____ is located on the _____ bone and is responsible for protecting the pituitary gland.
sella turcica; ethmoid
crista galli; sphenoid
sella turcica; sphenoid
occipital condyle; occipital bone
crista galli; ethmoid
The Correct Answer is C
Choice A reason: The sella turcica is correctly named, but it is located on the sphenoid bone, not the ethmoid. This makes the pairing incorrect.
Choice B reason: The crista galli is a projection of the ethmoid bone and serves as an attachment point for the falx cerebri, not for protecting the pituitary gland. Additionally, it is not located on the sphenoid bone.
Choice C reason: This is the correct answer. The sella turcica is a saddle-shaped depression in the sphenoid bone that houses and protects the pituitary gland. It is a central feature of the cranial floor.
Choice D reason: The occipital condyles are located on the occipital bone and articulate with the first cervical vertebra. They have no role in protecting the pituitary gland.
Choice E reason: While the crista galli is correctly paired with the ethmoid bone, it does not protect the pituitary gland. Its function is related to the attachment of meninges.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A reason: Osteomalacia is a condition characterized by softening of the bones due to defective bone mineralization, often caused by vitamin D deficiency. While it leads to bone weakness and pain, it does not primarily involve an imbalance between bone resorption and deposition.
Choice B reason: Rickets is the pediatric counterpart of osteomalacia and results from inadequate vitamin D, calcium, or phosphate. It causes bone deformities due to poor mineralization but is not defined by excessive bone resorption.
Choice C reason: Osteoporosis is the correct answer. It is a systemic skeletal disorder marked by decreased bone mass and microarchitectural deterioration of bone tissue. The hallmark of osteoporosis is that bone resorption by osteoclasts exceeds bone formation by osteoblasts, leading to porous, fragile bones and increased fracture risk.
Choice D reason: Paget’s disease involves disorganized bone remodeling, with excessive bone resorption followed by abnormal bone formation. However, the newly formed bone is structurally unsound and enlarged, not necessarily thin or fragile in the same way as osteoporosis.
Correct Answer is B
Explanation
Choice A reason: Microfilaments are components of the cytoskeleton found in many cell types, including muscle cells, but they are not the structural and functional unit of skeletal muscle.
Choice B reason: The sarcomere is the correct answer. It is the smallest contractile unit of skeletal muscle, composed of actin and myosin filaments arranged in a precise pattern. Sarcomeres are responsible for the striated appearance and contraction of skeletal muscle.
Choice C reason: The sarcoplasmic reticulum is an organelle that stores and releases calcium ions necessary for muscle contraction. While essential, it is not the structural and functional unit.
Choice D reason: Trabeculae are structural elements found in spongy bone, not muscle tissue. They do not play a role in muscle contraction.
Choice E reason: A fascicle is a bundle of muscle fibers, not the smallest functional unit. It is a larger structural grouping within the muscle
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