Lymphoid tissue that appears as a swelling of the mucosa in the oral cavity is called a(n)
appendix
thymus
Peyer's patch
tonsil
The Correct Answer is D
A. Appendix: The appendix contains lymphoid tissue but is located in the lower right abdomen and is not associated with the oral cavity.
B. Thymus: The thymus is a primary lymphoid organ in the mediastinum where T cells mature. It does not present as mucosal swelling in the oral cavity.
C. Peyer's patch: Peyer’s patches are lymphoid nodules in the small intestine that monitor intestinal antigens. They are not found in the oral cavity.
D. Tonsil: Tonsils are secondary lymphoid organs located in the pharyngeal region of the oral cavity. They appear as mucosal swellings and help trap and respond to inhaled or ingested pathogens, making them the correct choice.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. A decrease in oxygen levels:While low oxygen levels stimulate chemoreceptors, baroreceptors are not primarily sensitive to oxygen. Their function is focused on detecting pressure changes rather than gas concentrations.
B. Changes in arterial pressure:Baroreceptors in the carotid sinus and aortic arch detect stretch in the arterial walls caused by increases or decreases in blood pressure. This information is sent to the cardiovascular center to regulate heart rate and vessel tone, making them pressure-sensitive sensors.
C. An increase in oxygen levels:High oxygen levels do not directly affect baroreceptor activity. Baroreceptors respond to mechanical stretch, not oxygen concentration, so oxygen changes are irrelevant to their primary function.
D. A decrease in carbon dioxide:Carbon dioxide levels primarily influence chemoreceptors, not baroreceptors. While CO₂ can indirectly affect cardiovascular responses, baroreceptors themselves do not respond to changes in CO₂.
Correct Answer is A
Explanation
A. Blood vessel diameter:Vessel diameter has the greatest influence on blood flow resistance because resistance is inversely proportional to the fourth power of the radius. Small changes in diameter, especially in arterioles, can dramatically increase or decrease resistance, making it the most significant factor.
B. Blood vessel type:While different types of vessels (arteries, arterioles, capillaries, veins) have structural differences, the type itself does not directly determine resistance as much as the diameter within those vessels.
C. Blood viscosity:Blood viscosity affects resistance, with thicker blood increasing friction. However, normal physiological variations in viscosity are relatively minor compared with the impact of changes in vessel diameter.
D. Total blood vessel length:Longer vessels contribute to higher resistance, but vessel length is generally constant in adults. Therefore, its effect on resistance is less significant than diameter, which can change dynamically through vasoconstriction or vasodilation.
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