Page 1 - 2.Lesson_notes-Reproduction_in_human_beings

SAI International School
Subject- Biology, Class X
Chapter- How do Organisms Reproduce?
Subtopic- Reproduction in human beings
Module 21
Lesson notes

Primary and Secondary Sex organs
 The primary sex organs are gonads, which produce gametes (sex cells) and
secrete sex hormones.

 The gonads of the male are called testes which produce male gametes –
sperms and the male hormone – testosterone.

 The gonads of the female are called ovaries which produce female gametes –
ova and female hormone – estrogen and progesterone.
 Secondary sex organs include the genital ducts and glands which help in
transportation of gametes and reproductive processes.

 They do not produce gametes or secrete hormones.
Secondary sexual characters in human males
1. Broadening of shoulders and increased muscle development.

2. Enlargement of larynx and thickening of vocal cords producing deepening of
voice.
3. Growth of pubic hair and extra hair on the face, in the armpits and on the
chest.
Secondary sexual characters in human females

1. Growth of breasts and external genitalia (Vulva)
2. Broadening of pelvis

3. Initiation of menstruation and ovulation.

Male reproductive system

It consists of-
1. Testes
2. Scrotum
3. Vas deferens
4. Urethra
5. Penis

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