Where is the central chemoreceptor located?
Brain and aortic arch
Medulla of the brain stem
Carotid arteries and brain stem
Carotid arteries and aortic arch
The Correct Answer is B
A. Brain and aortic arch: The aortic arch contains peripheral chemoreceptors, but the central chemoreceptor is in the medulla.
B. Medulla of the brain stem: Central chemoreceptors located in the medulla monitor the levels of carbon dioxide (via pH changes) in the cerebrospinal fluid to regulate breathing.
C. Carotid arteries and brain stem: The carotid arteries contain peripheral chemoreceptors, but not central chemoreceptors.
D. Carotid arteries and aortic arch: These locations house peripheral chemoreceptors, not central ones.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Producing early induced proteins: While natural killer cells can produce cytokines, their primary function is not related to protein production.
B. Promoting opsonization of bacteria cells: Opsonization is primarily performed by antibodies and complement proteins, rather than natural killer cells.
C. Secreting signaling molecules: While natural killer cells do secrete signaling molecules (cytokines) to communicate with other immune cells, their main role is the direct destruction of infected cells.
D. Destroying virally infected cells: The primary function of natural killer cells is to recognize and eliminate virally infected cells and tumor cells, contributing to the innate immune response.
Correct Answer is D
Explanation
A. Liver: The liver plays a role in detoxification and metabolism but is not involved in lymphocyte production.
B. Stomach: The stomach is part of the digestive system, not the immune system.
C. Small Intestine: The small intestine is involved in nutrient absorption and contains some lymphoid tissue (Peyer's patches) but is not the main site of lymphocyte production.
D. Thymus: The thymus is the organ where T-lymphocytes mature and are essential for the immune response.
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