The nerve that stimulates the diaphragm is:
Phrenic
Pons
Sciatic
Accessory
The Correct Answer is A
A. The phrenic nerve is responsible for stimulating the diaphragm to contract and initiate breathing. It originates from the cervical spinal nerves (C3-C5) and plays a critical role in respiration.
B. The pons is a part of the brainstem involved in regulating breathing patterns but is not a nerve itself.
C. The sciatic nerve is the largest nerve in the body, primarily responsible for motor and sensory functions in the lower limbs, not for breathing.
D. The accessory nerve (Cranial Nerve XI) is involved in motor functions of the neck and shoulders, not the diaphragm.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Carotid artery and aorta contain the carotid bodies and aortic bodies, which are peripheral chemoreceptors. These structures detect changes in blood oxygen, carbon dioxide, and pH levels, sending signals to the respiratory centers to adjust breathing accordingly.
B. The cerebellum and pons are parts of the brain involved in motor control and respiratory rhythm, respectively, but do not contain peripheral chemoreceptors.
C. The coronary sinus and alveoli are not involved in detecting chemical changes in the blood for breathing regulation. The coronary sinus drains blood from the heart muscle, and the alveoli are sites of gas exchange, not chemoreception.
D. The brachiocephalic vein and superior vena cava are large veins that return deoxygenated blood to the heart but do not house chemoreceptors involved in respiratory regulation.
Correct Answer is D
Explanation
A. Allergic rhinitis is an allergic reaction to airborne particles like pollen or dust, and while it affects the upper respiratory system, it is not an infection.
B. COPD (Chronic Obstructive Pulmonary Disease) is a chronic condition that affects the lower respiratory system, especially the lungs, but it is not an infection.
C. Tuberculosis (TB) is a bacterial infection that primarily affects the lungs and is considered a lower respiratory infection, not an upper respiratory infection.
D. Acute Coryza is commonly known as the common cold, which is an upper respiratory infection caused by viruses such as rhinoviruses. It affects the nasal passages, throat, and sinuses.
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