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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Related Questions
Correct Answer is C
Explanation
A. Basal ganglia:
The basal ganglia are primarily involved in the regulation of movement, coordination, and certain cognitive functions. They do not play a direct role in the regulation of respiration.
B. Parietal lobe:
The parietal lobe of the brain is involved in processing sensory information related to touch, temperature, and pain. It does not have a primary role in the regulation of respiration.
C. Medulla:
The medulla oblongata, located in the brainstem, is crucial for the regulation of respiration. It contains the respiratory centers that control the rate and depth of breathing, making it the correct location responsible for this function.
D. Hypothalamus:
The hypothalamus is involved in various autonomic functions, including temperature regulation, hunger, and thirst. While it plays a role in regulating overall homeostasis, it is not the primary center for controlling respiration.
Correct Answer is C
Explanation
A. Androsterone and estradiol: Androsterone and estradiol are both sex hormones, but they do not function as antagonists. Androsterone is an androgen, and estradiol is an estrogen; they have different roles in sexual development and reproductive health but do not directly oppose each other.
B. Ghrelin and gastrin: Ghrelin and gastrin are hormones involved in regulating appetite and digestion. Ghrelin stimulates hunger, while gastrin stimulates gastric acid secretion. They do not act as direct antagonists to each other.
C. Insulin and glucagon: Insulin and glucagon are hormone antagonists that regulate blood glucose levels. Insulin lowers blood glucose by facilitating its uptake into cells, while glucagon increases blood glucose by promoting glycogen breakdown in the liver. Their actions counterbalance each other to maintain glucose homeostasis.
D. Calcitonin and melatonin: Calcitonin and melatonin have distinct functions; calcitonin helps regulate calcium levels in the blood, while melatonin regulates sleep-wake cycles. They do not have antagonistic effects on each other.
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