The breastbone is also known as
clavicle
sternum
scapula
manubrium
The Correct Answer is B
Rationale:
A. Commonly called the collarbone, it is a long bone that connects the sternum to the scapula. It is not the breastbone itself.
B. The sternum, or breastbone, is a flat bone located in the center of the chest. It consists of three parts: the manubrium (upper portion), the body (middle and largest portion), and the xiphoid process (the small inferior tip). It serves as an attachment site for the ribs and clavicles, playing a vital role in protecting the heart and lungs.
C. Also called the shoulder blade, it is located on the posterior thoracic wall and does not form the breastbone.
D. This is the upper portion of the sternum, but it is not the entire breastbone.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Rationale:
A. Thyroid refers to the thyroid cartilage (part of the larynx) or the thyroid gland, not a bone.
B. Clavicle is the collarbone, located in the shoulder region, not related to the larynx.
C. Hyoid is a U-shaped bone located in the anterior neck, superior to the larynx. It supports the tongue and is the only bone in the body that does not articulate with another bone.
D. Occipital is a cranial bone at the back and base of the skull, not in the neck region.
Correct Answer is A
Explanation
Rationale:
A. Muscle fiber is the correct term for a single muscle cell. It is multinucleated and contains many myofibrils.
B. Fascicle is a bundle of muscle fibers surrounded by connective tissue (perimysium), not a single cell.
C. Myofibril is a subcellular structure within a muscle fiber made up of repeating sarcomeres; many myofibrils make up one muscle fiber.
D. Myofilament refers to the protein filaments (actin and myosin) within myofibrils that are responsible for contraction, not the entire cell.
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