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.
In humans the pituitary gland or hypophysis has two basic parts called the anterior and posterior pituitary. The anterior part of the pituitary, adenohypophysis, is regulated by the hypothalamus and by a negative feedback from target organs.n humans the pituitary gland or hypophysis has two basic parts called the anterior and posterior pituitary. The anterior part of the pituitary, adenohypophysis, is regulated by the hypothalamus and by a negative feedback from target organs.