With reference to normal human beings, consider the following statements: I. In males, testosterone is secreted into the blood by Leydig cells. II. In females, the cells of the corpus luteum secrete estrogen into the blood. III. The fertilised ovum gets i

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Q: 112 (CDS-I/2003)
With reference to normal human beings, consider the following statements:
I. In males, testosterone is secreted into the blood by Leydig cells.
II. In females, the cells of the corpus luteum secrete estrogen into the blood.
III. The fertilised ovum gets implanted on the wall of uterus at the blastocyst stage.
Which of these statements are correct?

question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,24,15,6,2,7,24

keywords: 

{'leydig cells': [0, 0, 1, 0], 'secrete estrogen': [0, 0, 1, 0], 'uterus': [2, 0, 0, 0], 'testosterone': [1, 0, 0, 0], 'ovum': [0, 0, 2, 0], 'cells': [0, 0, 0, 1], 'blastocyst stage': [0, 0, 2, 0], 'females': [4, 3, 4, 1], 'males': [0, 0, 0, 1], 'luteum': [0, 0, 1, 0]}

The correct answer is option 4, which states that all three statements are correct. Let`s dissect each statement for better understanding.

Statement I: In males, testosterone is secreted into the blood by Leydig cells. This statement is correct. Leydig cells, which are found in the testes, are responsible for the production and secretion of testosterone, the primary male sex hormone.

Statement II: In females, the cells of the corpus luteum secrete estrogen into the blood. This statement is also correct. The corpus luteum is a temporary endocrine structure that forms in the ovary after ovulation. It produces hormones, including estrogen, which is important in the regulation of the female reproductive system.

Statement III: The fertilized ovum gets implanted on the wall of the uterus at the blastocyst stage. This statement is correct as well. After fertilization, the ovum (egg) undergoes multiple cell divisions and forms a structure called a blastocyst. The blastocyst then implants itself into the wall of the uterus, where it can develop into an embryo.

In conclusion, all three statements are correct. Testosterone is secreted by Leydig cells in males, estrogen is secreted by the cells of the corpus luteum in