What is the purpose of the foramen magnum in the skull?
To allow spinal cord passage
To house the pituitary gland
To anchor meninges
To attach facial muscles
The Correct Answer is A
A. To allow spinal cord passage: The foramen magnum is the large opening at the skull base through which the brainstem continues as the spinal cord and major vessels and nerves pass.
B. To house the pituitary gland: The pituitary gland sits in the sella turcica of the sphenoid bone, not in the foramen magnum.
C. To anchor meninges: While meninges attach to cranial structures, anchoring of meninges is not the primary role of the foramen magnum.
D. To attach facial muscles: Facial muscles attach to facial bones and soft tissue rather than to the foramen magnum.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. To bind to troponin, allowing cross-bridge formation:Calcium ions bind to troponin, causing a conformational change that exposes myosin-binding sites on actin and permits cross-bridge cycling.
B. To stimulate the release of acetylcholine:Calcium influx into the presynaptic nerve terminal triggers acetylcholine release, but the primary role of calcium in muscle contraction is within the muscle fiber at troponin.
C. To provide energy for muscle contraction:Energy for contraction is supplied by ATP, not by calcium ions.
D. To transport oxygen to muscle cells:Oxygen transport is the role of hemoglobin and myoglobin, not calcium ions.
Correct Answer is B
Explanation
A. Medullary cavity:The medullary cavity is the hollow central space within the diaphysis that contains bone marrow; it is not where bone lengthening takes place.
B. Epiphyseal plate:The epiphyseal plate (growth plate) is the area of hyaline cartilage between the diaphysis and epiphysis where new bone is produced, leading to longitudinal bone growth during development.
C. Periosteum:The periosteum is a dense connective tissue layer covering the outer surface of bones and contributes to bone thickness and repair rather than length.
D. Articular cartilage:Articular cartilage covers the ends of bones in joints to provide a smooth surface for movement but is not involved in bone growth.
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