REPRODUCTION IN HUMANS

Biology

REPRODUCTION IN HUMANS

The female reproduction system consists of the following:

Ovaries

  • Are two oval cream coloured structures found in lower abdomen below the kidneys. Oviducts.
  • They produce the ova.
  • Are tubes which conduct the ova produced by the ovaries to the uterus.
  • Fertilization occurs in the upper part of the oviduct.

Uterus

  • The uterus is a hollow muscular organ found in the lower abdomen.
  • The embryo develops inside the uterus.
  • The inner lining endometrium supplies nutrients to embryo.
  • The embryo is implanted into the inner uterine wall- the endometrium which nourishes the embryo.
  • The thick muscles of the uterus assist in parturition.
See also  POLLUTION

Cervix

  • Has a ring of muscles that separates the uterus from the vagina.
  • It forms the opening to the uterus

Vagina

  • Is a tube that opens to the outside and it acts as the copulatory and birth canal through the vulva.

The male reproductive system consists of the following: Testis:

  • Each testis is a mass of numerous coiled tubes called semniferous tubules.
  • Each is enclosed within a scrotal sac that suspends them between the thighs.
  • This ensures that sperms are maintained at a temperature lower than that of the main body.
See also  TYPES, LOCATIONS AND FUNCTION OF MUSCLES

Seminiferous tubules

  • The lining of seminiferous tubules consists of actively dividing cells which give rise to sperms.
  • Between the seminiferous tubules are interstitial cells which produce the male hormones called androgens e.g. testosterone.
  • The seminiferous tubules unite to form the epididymis, which is a coiled tube where sperms are stored temporarily.
  • Vas deferens (sperm duct) is the tube through which sperms are carried from testis to urethra.
  • Seminal vesicle produces an alkaline secretion which nourishes the spermatozoa.
See also  SUPPORT AND MOVEMENT IN PLANTS

Prostate gland

  • Produces an alkaline secretion to neutralise vaginal fluids.

Cowpers’ gland

  • Secretes an alkaline fluid.
  • All these fluids together with spermatozoa form semen.

Urethra

  • Is a long tube through which the semen is conducted during copulation.
  • It also removes urine from the bladder. Penis
  • Is an intro-mittent organ which is inserted into the vagina during copulation .

See also

REPRODUCTION IN ANIMALS

METHODS OF FRUIT AND SEED DISPERSAL

POLLINATION

SEXUAL REPRODUCTION IN PLANTS

ASEXUAL REPRODUCTION

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