The ___________ is not an organ of the urinary system.
urethra
ureter
kidney
urinary bladder
Liver
The Correct Answer is E
A. Urethra: The urethra is a part of the urinary system that carries urine from the urinary bladder to the outside of the body.
B. Ureter: The ureters are tubes that carry urine from the kidneys to the urinary bladder. They are part of the urinary system.
C. Kidney: The kidneys are the primary organs of the urinary system responsible for filtering blood and producing urine.
D. Urinary bladder: The urinary bladder is an organ in the urinary system that stores urine before it is excreted.
E. Liver: The liver is not an organ of the urinary system. It plays a crucial role in metabolism, detoxification, and bile production, but it is part of the digestive system.
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Correct Answer is A
Explanation
A. Small intestine, particularly the ileum, contains Peyer's patches, which are abundant lymphoid tissues in the mucosa and submucosa. These structures are part of the immune system, protecting the body from pathogens in the digestive tract.
B. Stomach: While the stomach has some lymphoid tissue, it does not have as much as the small intestine, specifically the Peyer's patches.
C. Large intestine has lymphoid nodules, but it does not contain as much lymphoid tissue as the small intestine.
D. Esophagus has very little lymphoid tissue compared to the small intestine, as its primary function is to transport food rather than participate in immune defense.
Correct Answer is A
Explanation
A. Two haploid (n) cells; four haploid (n) cells: At the end of meiosis I, the result is two haploid cells, each with half the number of chromosomes of the original cell. At the end of meiosis II, these two haploid cells divide again to form a total of four haploid cells.
B. Two diploid (2n) cells; one haploid (n) cell: This option is incorrect because meiosis I produces two haploid cells, not diploid cells, and meiosis II produces four haploid cells, not one.
C. Two diploid (2n) cells; four haploid (n) cells: This option is incorrect because meiosis I does not produce diploid cells; it produces two haploid cells. At the end of meiosis II, the result is four haploid cells, which is correct, but the description of meiosis I is incorrect.
D. Two haploid (n) cells; one diploid (2n) cell: This is incorrect because meiosis I results in two haploid cells, and meiosis II results in four haploid cells, not one diploid cell.