Which bone is commonly known as the collarbone?
Humerus
Scapula
Clavicle
Sternum
The Correct Answer is C
A. Humerus: The humerus is the long bone of the upper arm, connecting the shoulder to the elbow. It is not associated with the term “collarbone.”
B. Scapula: The scapula, or shoulder blade, is a flat triangular bone located on the posterior side of the ribcage. It does not serve as the collarbone.
C. Clavicle: The clavicle is commonly known as the collarbone. It is a long, slender bone that connects the sternum to the scapula, providing support and stability to the shoulder and allowing a wide range of arm movement.
D. Sternum: The sternum, or breastbone, is a flat bone located in the center of the chest. It articulates with the clavicles but is not referred to as the collarbone.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. It allows for longitudinal bone growth: The epiphyseal plate, or growth plate, is a layer of hyaline cartilage located between the epiphysis and diaphysis. It enables bones to lengthen during childhood and adolescence through the process of endochondral ossification.
B. It acts as a site for red blood cell production: Red blood cell production occurs primarily in the bone marrow, not in the epiphyseal plate. The growth plate is involved in bone elongation rather than hematopoiesis.
C. It stores calcium for bone strength: Calcium storage occurs in the bone matrix, particularly in compact and spongy bone tissue, not within the epiphyseal plate itself.
D. It provides a surface for muscle attachment: Muscle attachment occurs on bony landmarks such as tuberosities, processes, and ridges. The epiphyseal plate’s function is related to bone growth, not serving as a site for muscle attachment.
Correct Answer is C
Explanation
A. Increased heart rate: Increased heart rate is a result of sympathetic nervous system stimulation, not parasympathetic activity.
B. Increased cardiac contractility: The parasympathetic system has minimal effect on contractility; it primarily influences heart rate rather than the force of contraction.
C. Decreased heart rate: Parasympathetic stimulation, mainly via the vagus nerve, releases acetylcholine, which slows the sinoatrial node firing rate and decreases heart rate.
D. Increased conduction velocity: Parasympathetic activity slows conduction through the atrioventricular node, reducing conduction velocity rather than increasing it.
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