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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Tricuspid:
The tricuspid valve, located between the right atrium and right ventricle, has three leaflets (or cusps. and is open during the systolic phase to allow blood flow from the right atrium to the right ventricle. It does not fit the description of having two leaflets.
B. Aortic:
The aortic valve, situated between the left ventricle and the aorta, has three leaflets and is closed during diastole to prevent backflow of blood from the aorta into the left ventricle. It is not closed during the systolic phase and does not have two leaflets.
C. Mitral:
The mitral valve, located between the left atrium and left ventricle, has two leaflets (or cusps. and is closed during the systolic phase of the cardiac cycle. This closure prevents the backflow of blood from the left ventricle into the left atrium as the ventricle contracts, making it the correct answer.
D. Pulmonic:
The pulmonic valve, located between the right ventricle and the pulmonary artery, has three leaflets and is closed during diastole to prevent backflow from the pulmonary artery into the right ventricle. It does not have two leaflets and is not closed during the systolic phase.
Correct Answer is A
Explanation
A. Epiglottis: The epiglottis is a leaf-shaped flap of cartilage located at the base of the tongue. During swallowing, it moves downward to cover the opening of the trachea (the glottis. , preventing food and liquid from entering the airway and directing them into the esophagus.
B. Uvula: The uvula is a small, fleshy extension at the back of the soft palate. Its role is to help prevent food from entering the nasal cavity during swallowing and to aid in speech, but it does not close the trachea.
C. Vestibular fold: The vestibular folds, or false vocal cords, are located in the larynx and contribute to the protection of the vocal cords and to phonation. They do not function to close the trachea during swallowing.
D. Cricoid cartilage: The cricoid cartilage is a ring-shaped cartilage located below the thyroid cartilage in the larynx.
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