The clot grows. Proteins in your blood called clotting factors signal each other to cause a rapid chain reaction. It ends with a dissolved substance in your blood turning into long strands of fibrin. These get tangled up with the platelets in the plug to create a net that traps even more platelets and cells.
The Male Reproductive System The main role of the male reproductive system is to make and deliver sperm. The testes are the main organs of the male system. Two testes are held in an external sac called the scrotum. The testes make sperm in tiny tubes called seminiferous tubules.The sperm mature and are stored in an epididymis. A tube called a vas deferens carries sperm from each testis to the urethra within the penis.Along the way, secretions of several glands form a nutrient-rich fluid called seminal fluid.he sperm mature and are stored in an epididymis. A tube called a vas deferens carries sperm from each testis to the urethra within the penis. Along the way, secretions of several glands form a nutrient-rich fluid called seminal fluid.
the function of the pollen sac is to produce pollen (pollen grains). The pollen sac is the microsporangium of a seed plant in which pollen is produced. Most plants except coni â¦ ferous plants contain four (4) pollen sacs. The pollen tube of most seed plants acts as a conduit to transport sperm cells from the pollen grain, either from the stigma (in flowering plants or angiosperms) to the â¦ ovules at the base of the pistil, or directly through ovule tissue in some gymnosperms (conifers and gnetophytes).