BiologyCLASS 10CBSE
answered 25 May 2026What is semen?
A.VERIFIED ANSWERfact-checked by tutors
Semen is the biological fluid produced by the male reproductive system, released during ejaculation. It serves as the transport medium for sperm cells.
Composition:
| Component | Source | Proportion | Function |
|---|---|---|---|
| Sperm cells | Testes | 2–5% | Carry genetic material to fertilize an egg |
| Seminal fluid | Seminal vesicles | ~60–65% | Provides fructose (energy for sperm) |
| Prostatic fluid | Prostate gland | ~25–30% | Neutralizes vaginal acidity; contains enzymes |
| Bulbourethral fluid | Cowper's glands | Small amount | Lubricates urethra |
Facts:
- Average volume per ejaculation: 1.5–5 mL
- Average sperm count: 15–200 million sperm per mL
- Sperm lifespan inside the female reproductive tract: up to 5 days
- pH: slightly alkaline (7.2–8.0) — protects sperm in the acidic vaginal environment
Semen and urine both travel through the urethra but are released separately the prostate gland prevents simultaneous release.