#144 Sex hormones
Sex hormones (testosterone in boys and oestrogen in girls) are responsible for the development of secondary sexual characteristics at puberty.
Sex hormones
Puberty
- the sex organs (ovaries in girls, testes in boys) become mature and start to secret hormones, making gametes (ova and sperms)
- happens at about 10-14 years.
- happens at about 10-14 years.
Sites of production of oestrogen and progesterone in the menstrual cycle and in pregnancy
Try this
Answer
a) i) Sperm duct labeled correctly between the testes and urethra.
ii) Urethra labeled correctly between bladder and tip of penis.
b) In males the urethra carries urine and semen at different times; in females the urethra only carries urine.
c) i) Two male secondary sexual characteristics from:
- voice becomes much lower (breaks)
- hair starts to grow on chest, face, under arms and pubic area
- body becomes more muscular
- penis becomes larger
- testes start to produce sperm.
ii) Testis (or testes) labeled correctly.
iii) testosterone makes muscles grow, so the athletes can run faster or perform better.
a) i) Sperm duct labeled correctly between the testes and urethra.
ii) Urethra labeled correctly between bladder and tip of penis.
b) In males the urethra carries urine and semen at different times; in females the urethra only carries urine.
c) i) Two male secondary sexual characteristics from:
- voice becomes much lower (breaks)
- hair starts to grow on chest, face, under arms and pubic area
- body becomes more muscular
- penis becomes larger
- testes start to produce sperm.
ii) Testis (or testes) labeled correctly.
iii) testosterone makes muscles grow, so the athletes can run faster or perform better.