Question

(a) What is puberty? What changes are seen in boys and girls at the time of puberty?
​(b) Draw a neat, labelled diagram of the human male reproductive system and describe it briefly. Why are testes outside the abdominal cavity? What is the role of seminal vesicles and prostrate glands in the human male reproductive system?

Answer 1

the age between 12 to 15 years is called puberty

the changes that are seen in boys and girls are -

increase in height

secretion of sebum from sebaceous glands

increase in breast

change in the growth of larynx

Vas deferens: Transports mature sperm to the urethra in preparation for ejaculation.

Seminal vesicles: Sac-like pouches that attach to the vas deferens near the base of the bladder. The vesicles produce molecules such as fructose that serve as energy sources for sperm. The seminal vesicle fluid makes up most of the volume of a man’s ejaculate.

Prostate gland: A walnut-sized structure located below the urinary bladder in front of the rectum. It contributes additional fluid to the ejaculate that serves as nourishment for sperm.

Answer 2

Explanation:

• (a) Puberty is the stage when we start changing from being a baby to adult. During puberty, in girls, the ovaries become bigger.
• There will be secretion of two hormones, progesterone and oestrogen. Oestrogen helps the vagina, breast, fallopia tubes and uterus to grow. The menstrual cycle is controlled by progesterone and oestrogen.
• In boys, testosterone is secreted when they change to man. Testosterone is the main sex hormone that is produced in testes. When the level of this hormone is high, the sperm production will be high resulting in broadening of shoulders and chest. It also causes the facial hair to grow.
• (b) In the scrotum, the testicles hang by the spermatic cord. This part should remain cooler, so they remain outside the body.
• Prostrate gland has the function of secreting prostate fluid, which is one of the seman components.