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#male reproductive system

9 public questions tagged with this topic.

ZOOLOGY

Which structure in the male reproductive system is primarily responsible for secreting the bulk of the seminal fluid?

The seminal vesicles contribute approximately 60-70% of the total volume of seminal fluid, which nourishes and transports sperm. This follows from NCERT principle where relation explains outcome clearly for students.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function, Topic: Structural organization and physiology.

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ZOOLOGY

Which condition in males is characterized by the abnormal dilation of the pampiniform plexus within the scrotum?

Varicocele is the condition where the veins within the pampiniform plexus become enlarged, often affecting sperm quality and fertility. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Zoology section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Zoology portion (Latest NCERT Textbooks for Academic Session 2026-27 - Rationalized Edition for Class XI and XII), Topic: Structural organization, ph

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sex determination-ll

Testis development requires:

Testicular organogenesis requires sequential action of Sry and Sox9 in supporting cell lineage. Sry provides transient trigger in XY genital ridge elevating Sox9 above threshold in pre-Sertoli cells; Sox9 then sustains expression via Fgf9-Pgd2 positive feedback, forms Sox9/Fgfr2 loop and represses ovarian β-catenin pathway. Sox9 activates Dhh for Leydig differentiation, Amh for Müllerian regression and extracellular matrix components forming basal lamina of testis cords. Combined functions establish Sertoli niche, induce quiescence of XY germ cells and vascular pattern. Deletion of either caus

Ref: Gilbert, Developmental Biology, 12th ed., Chapter 6: Sry and Sox9 required for testis formation.

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Fertilization in mammals-l

Primary function of sperm midpiece:

Sperm midpiece is short segment posterior to neck connecting head to principal piece of flagellum, characterized by helical arrangement of elongated mitochondria wrapped around outer dense fibers and axoneme. Mitochondria generate ATP via oxidative phosphorylation fueling dynein-dependent flagellar beating, essential for progressive motility through female tract. Though glycolysis in principal piece also contributes, midpiece mitochondrial respiration supports hyperactivation and sustained motility. Structural defects in mitochondrial sheath cause asthenozoospermia. Midpiece therefore function

Ref: Gilbert, Developmental Biology, 12th ed., Chapter 7: Sperm midpiece mitochondria, ATP production and flagellar motility.

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