Place the following in correct sequence from the formation of a drop of urine to its elimination from the body.
1. major calyx
2. minor calyx
3. nephron
4. urethra
5. ureter
6. collecting duct
3, 6, 2, 1, 5, 4
2, 1, 3, 6, 5, 4
3, 1, 2, 6, 5, 4
6, 3, 2, 1, 5, 4
5. ureter
The Correct Answer is A
A. 3, 6, 2, 1, 5, 4: Urine formation begins in the nephron and enters the collecting duct for final concentration. Fluid then flows into the minor calyx, then the major calyx, through the ureter to the bladder, and finally exits the body via the urethra. This sequence accurately reflects the anatomical flow of filtrate.
B. 2, 1, 3, 6, 5, 4: This sequence incorrectly places the minor and major calyces before the nephron and collecting duct. Filtration must occur in the microscopic nephron unit before any fluid can enter the macroscopic drainage system of the renal pelvis. The calyces are receiving structures, not forming structures.
C. 3, 1, 2, 6, 5, 4: This arrangement suggests that the major calyx precedes the minor calyx and collecting duct, which is anatomically impossible. The minor calyces merge to form major calyces, which then form the renal pelvis. The collecting duct is the final microscopic segment before the calyces.
D. 6, 3, 2, 1, 5, 4: The collecting duct receives fluid from the distal convoluted tubules of the nephron, so the nephron must come first in the sequence. While both are microscopic, the nephron is the site of initial ultrafiltration and tubular processing. The sequence must start at the renal corpuscle.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. estrogen: Estrogen is the primary hormone responsible for female secondary sex characteristics, such as breast development and pelvic widening. While males produce small amounts of estrogen through the aromatization of testosterone, it does not drive the development of male traits. Excessive estrogen in males can lead to feminization.
B. progesterone: This hormone is primarily involved in the female menstrual cycle and the maintenance of pregnancy. It prepares the endometrium for implantation and supports the secretory phase of the uterine cycle. It plays no significant role in the development of male secondary sex characteristics or male reproductive maturation.
C. testosterone: Secreted by the interstitial endocrine cells of the testes, testosterone is the primary androgen responsible for male maturation. It drives the growth of facial and body hair, the deepening of the voice through laryngeal enlargement, and the increase in muscle mass. It is also essential for the initiation of spermatogenesis.
D. growth hormone: While growth hormone is essential for overall somatic growth and bone elongation during puberty, it does not specifically determine sexual characteristics. It works synergistically with sex steroids but lacks the specific androgenic effects required for the development of male-specific traits. Its action is generalized across most body tissues.
Correct Answer is C
Explanation
A. urinary acidosis: The renal system responds to systemic acid-base imbalances by secreting hydrogen ions or reabsorbing bicarbonate, but it is not the primary physiological state induced by localized rebreathing. Urinary changes are a compensatory mechanism rather than the direct result of the respiratory disturbance. This choice confuses a compensatory response with the primary insult.
B. urinary alkalosis: The kidneys would excrete bicarbonate in an attempt to compensate for alkalosis, not the acidosis caused by carbon dioxide retention. Rebreathing into a bag leads to hypercapnia, which necessitates an acidic urinary response for compensation. Therefore, an alkaline urine profile would be inappropriate and physiologically counterproductive in this specific clinical scenario.
C. respiratory acidosis: Rebreathing into a paper bag causes the accumulation of expired carbon dioxide within the bag, which is then inhaled. This leads to hypercapnia, an increase in the partial pressure of carbon dioxide in the blood, shifting the bicarbonate buffer equation toward hydrogen ion production. The resulting decrease in systemic pH is classified as respiratory acidosis.
D. metabolic alkalosis: This condition is characterized by an primary increase in bicarbonate or a loss of metabolic acids, such as through severe vomiting. Breathing into a bag affects the volatile acid, carbon dioxide, rather than metabolic fixed acids or bases. Consequently, this respiratory intervention cannot directly induce a primary metabolic alkaline state.
E. metabolic acidosis: Metabolic acidosis arises from the accumulation of non-volatile acids like lactic acid or ketones, or the loss of bicarbonate. While respiratory acidosis can coexist with metabolic issues, the act of rebreathing specifically targets the respiratory component of acid-base balance. It does not primarily alter the metabolic production or excretion of fixed acids.
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