Semen consists of 2 components: the sperm component and a fluid component. Sperm is produced by the testicles. The fluid component is secreted by the prostate gland, bulbourethral (or Cowper's) glands, and seminal vesicles. The fluid component provides nutrition for the sperm as well as neutralizes the acidic environement of the urethra of the penis and the vagina of the female.
Structures involved in producing semen:
The Seminiferous Tubules give sperms. The seminal vescicles gives liquid content of the semen.
The prostate & the seminal Vesicles
photosynthesis
Ferterlization
You larynx
Photosynthesis
Mitochondria
That is certainly a young age for producing semen.
Not normally once semen production has started it will keep on producing into old age.
Spore producing structures
There is no blood in semen. The father's semen and the mother's egg are both required for childbirth.
drink a lot of milk...
This age will be different for each person. When a boy's body begins producing the hormones of puberty in sufficient levels, his sexual organs will begin producing semen. This generally begins between 12 and 14 years old.
The dermal tissue structures responsible for fingerprints are dermal papillae. They are tiny extensions of the dermis into the epidermis.
The ribosomes are responsible for protein synthesis.
The chloroplast.
Blood cells.
Ribosome
The seminal vesicles