Name this valve:
Ileoappendix
Pyloric sphincter
Duodenorenal
Ileocecal
The Correct Answer is D
A. Ileoappendix: Not a standard anatomical valve -the term suggests a junction with the appendix but is not the valve between small and large intestine.
B. Pyloric sphincter: The pyloric sphincter is between the stomach and duodenum, not at the ileum–cecum junction.
C. Duodenorenal: Not a recognized valve -describes a relation between duodenum and kidney region, not a valve.
D. Ileocecal: The ileocecal (ileocecal/ileocecal) valve is the sphincter at the junction of the terminal ileum and cecum that controls flow of chyme into the large intestine.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Proximal convoluted tubule: The PCT reabsorbs the majority of filtered water and solutes (≈65% Na⁺/H₂O, all filtered glucose and amino acids, many ions).
B. Efferent arteriole: An efferent arteriole is a blood vessel leaving the glomerulus (carries blood), not a tubular segment that reabsorbs filtrate.
C. Afferent arteriole: Afferent arteriole supplies blood to the glomerulus; it is not involved in tubular reabsorption.
D. Loop of Henle: The loop helps concentrate urine (water reabsorption in the descending limb, ion transport in the ascending limb) but the PCT is the primary site for bulk reabsorption.
Correct Answer is B
Explanation
A. Diffusion of gas does not depend on the partial pressure gradient: Incorrect -gas diffusion across membranes depends on partial pressure gradients (and membrane properties).
B. Gas diffuses from high partial pressure to low partial pressure: Correct -diffusion follows the partial pressure gradient (for example O₂ moves from alveoli where PO₂ is higher into blood where PO₂ is lower).
C. Gas diffuses from low partial pressure to high partial pressure: Incorrect -that direction would require active transport; gases passively diffuse down their gradients.
D. Equilibrium can be reached without partial pressure gradient: Incorrect -equilibrium is reached when partial pressures equalize; without a gradient diffusion won’t proceed.
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