Which of the following is the name for the shaft of a long bone?
Diaphysis
Periosteum
Cortex
Osteoid
The Correct Answer is A
A. The diaphysis is the shaft of a long bone, the central part that extends between the two epiphyses (ends). It is primarily composed of compact bone and houses the bone marrow.
B. The periosteum is a dense layer of connective tissue that covers the outer surface of bones, except at the joints. It does not represent the shaft of the bone.
C. The cortex refers to the outer layer of the bone, specifically the compact bone that surrounds the spongy bone in the diaphysis. It is not synonymous with the shaft.
D. Osteoid is the organic matrix of bone tissue, composed of collagen and other proteins, but it does not refer to the shaft of a bone.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. The Bundle of His is the pathway that carries the electrical impulse from the AV node to the right and left bundle branches, which leads to the Purkinje fibers and ultimately causes the ventricles to contract.
B. The Purkinje fibers are the last component of the conduction system, responsible for rapidly transmitting the impulse to the ventricular muscle to trigger contraction, but the impulse must first travel through the Bundle of His.
C. The SA node is the natural pacemaker of the heart, initiating the electrical impulse, but the impulse does not travel to the SA node after the AV node. The SA node sends impulses to the atria first.
D. The bundle branches are part of the conduction system that transmits the electrical impulse to the Purkinje fibers. The impulse reaches the bundle branches after traveling through the Bundle of His.
Correct Answer is A
Explanation
A. Myelin is a fatty substance that wraps around axons in many neurons. It acts as an insulative covering that speeds up the transmission of nerve impulses by enabling the signal to jump between gaps in the myelin (called nodes of Ranvier). This is the correct answer.
B. The synapse is the junction between two neurons where signals are transmitted. It is not involved in the insulative covering of a neuron.
C. The axon is the long, slender part of a neuron that transmits electrical signals, but it requires myelin to efficiently conduct those signals.
D. Dendrites are branched extensions of a neuron that receive signals from other neurons. They do not have an insulative function.
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