Which of the following terms identifies the point of contact between the nerve ending and the muscle fiber?
Insertion site
Interneuron
Neuromuscular junction
Origin site
The Correct Answer is C
A. Insertion site:
The insertion site refers to the point where a muscle attaches to a bone or structure that it moves. While it is important in understanding muscle function, it is not specifically the point of contact between a nerve ending and a muscle fiber.
B. Interneuron:
Interneurons are a type of neuron found within the central nervous system that connect other neurons. They are not involved in the direct contact between nerve endings and muscle fibers.
C. Neuromuscular junction:
The neuromuscular junction is the specialized synapse or connection point between a motor neuron and a muscle fiber. It is where the nerve ending communicates with the muscle fiber to initiate muscle contraction, making this the correct term for the point of contact.
D. Origin site:
The origin site is the point where a muscle attaches to a stationary bone or structure. It is not the site where nerve endings interact with muscle fibers. The neuromuscular junction is specifically responsible for this interaction.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Larynx: The larynx, also known as the voice box, contains the vocal cords (or vocal folds. . It is responsible for producing sound when air passes over the vocal cords, causing them to vibrate. The larynx also plays a role in protecting the airway during swallowing.
B. Pharynx: The pharynx is a muscular tube that connects the nasal and oral cavities to the esophagus and larynx. It is involved in the passage of air and food but does not contain the vocal cords.
C. Epiglottis: The epiglottis is a cartilage flap that covers the trachea during swallowing to prevent food from entering the airway. It does not contain the vocal cords.
D. Trachea: The trachea is the windpipe that conducts air to and from the lungs. It does not contain the vocal cords; rather, it is located below the larynx where the vocal cords are housed.
Correct Answer is B
Explanation
A. The outer tissue layer consisting of renal corpuscles and convoluted tubules:
This description refers to parts of the renal cortex rather than the renal pelvis. The renal corpuscles (glomeruli and Bowman's capsules. and convoluted tubules are part of the nephron located in the renal cortex, not the renal pelvis.
B. The cavity where urine flows from the calyces to enter the ureters:
The renal pelvis is a funnel-shaped cavity within the kidney where urine collects before flowing into the ureters. It serves as the conduit through which urine exits the kidney and enters the ureters, making this the correct description.
C. The expanded area of a renal tubule that encloses the glomerulus:
This describes the Bowman's capsule, which is a part of the nephron where filtration of blood occurs. It does not pertain to the renal pelvis.
D. The inner tissue layer consisting of the loop of Henle and collecting tubules:
This description pertains to the renal medulla, where the loop of Henle and collecting tubules are located. It does not describe the renal pelvis.
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