The following statements about all veins are true, except____
veins only carry blood low in oxygen
veins are our blood reservoirs
blood pressure is low in veins
veins have valves
there are no exceptions, all of the above are true
The Correct Answer is A
A. Veins only carry blood low in oxygen: This statement is false because pulmonary veins carry oxygenated blood from the lungs to the heart. Not all veins carry deoxygenated blood; the oxygen content depends on the circulation pathway.
B. Veins are our blood reservoirs: Veins are capacitance vessels that can hold large volumes of blood, acting as reservoirs. This property helps maintain circulatory stability and allows the body to adjust blood distribution as needed.
C. Blood pressure is low in veins: Venous pressure is significantly lower than arterial pressure because veins are farther from the pumping action of the heart and have thinner walls with less smooth muscle.
D. Veins have valves: Many veins, especially in the limbs, contain valves that prevent backflow and assist in returning blood to the heart against gravity. These valves are crucial for maintaining unidirectional flow.
E. There are no exceptions, all of the above are true: This is incorrect because statement A is false; veins do not exclusively carry deoxygenated blood.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Has a lag period while B cells proliferate and differentiate into plasma cells:The primary immune response involves initial exposure to an antigen. B cells require time to recognize the antigen, proliferate, and differentiate into plasma cells that secrete antibodies, resulting in a delayed but specific response.
B. Is another name for immunological memory:Immunological memory refers to the enhanced response of the secondary immune response due to memory cells. It is not synonymous with the primary immune response, which occurs upon first exposure to an antigen.
C. Occurs more rapidly and is stronger than the secondary response:The primary response is slower and weaker than the secondary response. Memory cells generated during the primary response enable the secondary response to act faster and with higher antibody production.
D. Occurs when memory cells are stimulated:Stimulation of memory cells triggers the secondary immune response, not the primary response. The primary response occurs when naive B and T cells encounter an antigen for the first time.
Correct Answer is C
Explanation
A. Pharyngeal tonsils:Pharyngeal tonsils, also called adenoids, are located in the posterior wall of the nasopharynx. They do not reside at the base of the tongue, so they are not the correct choice.
B. Palatine tonsils:Palatine tonsils are located on either side of the oropharynx. They are the commonly referred “tonsils” but are positioned laterally, not at the base of the tongue.
C. Lingual tonsils:Lingual tonsils are located at the posterior base of the tongue. They are composed of lymphoid tissue that helps protect the body from ingested or inhaled pathogens, making this the correct answer.
D. Tubal tonsils:Tubal tonsils surround the openings of the auditory (Eustachian) tubes in the nasopharynx. They are not located on the tongue.
E. Peyer's tonsils:Peyer’s patches are lymphoid follicles in the distal small intestine, not in the oral cavity, so they do not correspond to the tonsils at the tongue base.
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