What is the purpose of tubular secretion?
To increase the effectiveness of drugs and hormones in the blood
To remove excess quantities of substances from the blood
To filter out pathogens from the blood
To remove 99% of the water from the blood
The Correct Answer is B
A. To increase the effectiveness of drugs and hormones in the blood: Tubular secretion helps in removing drugs and hormones, not increasing their effectiveness.
B. To remove excess quantities of substances from the blood: Tubular secretion is responsible for removing excess ions, waste products, and drugs from the blood and excreting them into the urine.
C. To filter out pathogens from the blood: Filtration primarily occurs at the glomerulus, not tubular secretion, and it does not focus on pathogens.
D. To remove 99% of the water from the blood: This is not the purpose of tubular secretion; water reabsorption primarily happens in the nephron’s other parts.
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Related Questions
Correct Answer is D
Explanation
A. Gametes are only found in males: This statement is incorrect; gametes (sperm and eggs) are found in both males and females.
B. Gametes have double the chromosomes: This is incorrect; gametes are haploid (having half the number of chromosomes), while somatic cells are diploid (having two sets of chromosomes).
C. Gametes do not go through cell division: Gametes are produced through meiosis, which is a type of cell division.
D. Gametes go through meiosis: Gametes are produced through meiosis, a specialized form of cell division that reduces the chromosome number by half, allowing for sexual reproduction.
Correct Answer is D
Explanation
A. Seminal duct: There is no structure specifically called the "seminal duct" in male anatomy.
B. Epididymis: The epididymis is the tube where sperm mature, and it connects to the ductus deferens, not the urethra.
C. Prostatic duct: Prostatic ducts release prostatic fluid into the urethra, but they do not connect the ductus deferens to the urethra.
D. Ejaculatory duct: The ejaculatory duct connects the ductus deferens to the urethra, allowing sperm to enter the urethra for ejaculation.
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