Cowper’s gland, semen,
epididymis, seminal vesicle
erection, sperm
nocturnal emissions, testes
orgasm, urine
penis, urethra
prostate, vas deferens
scrotum, are the terms

First, sperm are produced in the small tubules of the testes. These oval shaped glands are protected by a sac called the scrotum. After the sperm cells are produced, they are stored in a large coiled tube on the outer surface of each testicle called the epididymis. From this tube the sperm go into a larger tube called the vas deferens, which eventually carries them to the external male reproductive organ, the penis. Along the way sperm is nourished by a sugary fluid from the Cowper's Gland, a chemical fluid from the prostate which is the most common site of cancer in men, and a fluid from the seminal vesicle, which are two small glands located near the bladder. These fluids plus the sperm cells combine to form semen, the fluid ejaculated from the penis during orgasm. Before a male can ejaculate, the spongy tissue surrounding the penis becomes engorged with blood causing the penis to become stiff and hard. This is known as an erection. The tube that carries the semen from the body is urethra. This tube also carries urine from the bladder. Males can also have uncontrolled ejaculation during sleep, which are called nocturnal emissions.

Explanation:

The male reproductive system comprises of various sex organs that assume a job during the time spent human multiplication. These organs are situated outwardly of the body and inside the pelvis. The reason for the organs of the male reproductive system is to play out the accompanying capacities:  

•To deliver, keep up, and transport sperm (the male reproductive cells) and defensive liquid (semen)  

•To release sperm inside the female reproductive tract during sex  

•To deliver and discharge male sex hormones liable for keeping up the male reproductive system

a- all cells come from pre-existing cells