The location of the central chemoreceptor is:
The cerebral cortex
The brain stem
The aorta
The cerebellum
The Correct Answer is B
A. The cerebral cortex is involved in higher brain functions like thinking and voluntary control of breathing but does not contain central chemoreceptors.
B. Central chemoreceptors are located in the medulla oblongata, a part of the brain stem. They detect changes in the pH of cerebrospinal fluid, which reflects CO₂ levels in the blood, and help regulate breathing accordingly.
C. The aorta contains peripheral chemoreceptors, not central ones. These aortic bodies monitor blood oxygen, carbon dioxide, and pH, but they are outside the central nervous system.
D. The cerebellum coordinates motor control and balance and does not play a role in chemoreception.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. The epiglottis is a flap of cartilage located at the base of the tongue that covers the trachea (windpipe) during swallowing. This directs food and liquids into the esophagus and prevents them from entering the airway.
B. The conchae (or turbinates) are structures inside the nasal cavity that help warm and humidify air, not related to swallowing food or liquids.
C. The glottis is the opening between the vocal cords that leads to the trachea, but it is not responsible for directing food into the esophagus.
D. The Adam's apple is part of the larynx and is primarily related to voice production, not swallowing.
Correct Answer is A
Explanation
A. Hemoglobin is an iron-containing protein found in red blood cells. It binds to oxygen in the lungs and carries it through the bloodstream to tissues throughout the body.
B. Antigens are substances that can trigger an immune response, but they are not involved in carrying oxygen in the blood.
C. Albumin is a protein in the blood that helps maintain osmotic pressure and transports various substances, but it does not carry oxygen.
D. Bicarbonate ions are involved in carbon dioxide transport in the blood, not oxygen. They help regulate the pH of blood and facilitate CO₂ transport from tissues to the lungs.
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