Gonads, Biology

Assignment Help:

GONADS -

They develop from the mesoderm of the embryo.

The gonads are the sex glands; the ovaries and the testes. They produce ova and sperms respectively i.e. cytogenic in nature but also secrete hormones.

(a) OVARIES. The hormones produced by the ovaries include oestrogens, progesterone, relaxin and inhibinlactin. (i) Oestrogens. These are secreted by the cells of Graafian (ovarian) follicles.

It stimulates the development of female secondary sex characteristics during puberty and maintains them through the reproductive years of adult life. It also stimulates maturation of ova (in the ovaries) and development of the uterine epithelium and the mammary glands.

(ii) Progesterone. It is secreted by the corpus luteum of the ovary.

It stimulates further development of the uterine epithelium and mammary glands. It is also required for the formation of the placenta and for the maintenance of pregnancy. Both estradiol and progesterone are required for ovulation.

(iii) Relaxin. It is secreted by the corpus luteum only during the later stages of pregnancy and helps to soften ligaments, especially those that hold the pubic symphysis together.

It may also affect other ligamets, e.g., if it affects a woman's foot ligaments, she may experience an increase in shoe size following pregnancy.

(iv) Inhibinlactin. Inhibinlactin is secreted by the corpus luteum. Inhibin hormone inhibits and actin hormone activates the FSH and GnRH production.

(b) TESTES

A pair of testes is situated in the scrotum of male. The connective tissue present between the seminiferous tubules in a testis contain small clusters of endocrine cells called interstitial cells or Leydig's cells.

These cells secrete various male sex - hormones called androgens. The principal androgen is testosterone.


Related Discussions:- Gonads

Name three effects that inbreeding can have on a population, Name three eff...

Name three effects that inbreeding can have on a population. Inbreeding can decrease the number of offspring produced, increase susceptibility to disease, reduce genetic varia

What are pleura, What are pleura, pericardium and peritoneum? Pleura ar...

What are pleura, pericardium and peritoneum? Pleura are the membrane that hides the lungs and the inner wall of the chest; pericardium is the membrane that hides the heart; per

Skin cancer, SKIN CANCER: CAUSES AND TREATMENT PURPOSE: The objective of t...

SKIN CANCER: CAUSES AND TREATMENT PURPOSE: The objective of this assignment is to make you aware of the structure and function of your skin, what are the dangers that your skin ma

#title.ehr, Why have biologists and bioinformaticians embraced the Web as a...

Why have biologists and bioinformaticians embraced the Web as a vehicle for disseminating data so quickly, whereas clinicians and clinical informaticians have been more hesitant to

Diagrammatic representation of implant placement, Diagrammatic representati...

Diagrammatic representation of Implant placement Implant placementIt is located directly apical to the tooth it is replacing and not in an embrasure space. The angulati

Growth curve, GROWTH CURVE - Sigmoid curve or stretched 'S' shap...

GROWTH CURVE - Sigmoid curve or stretched 'S' shaped curve is obtained showing - a - lag phase                              b - log phase c - in flaxion p

Concentration gradient and passive and active transport, Q. What is the rel...

Q. What is the relationship between concentration gradient and passive and active transport? Passive transport is the movement of substances across membranes in favour of their

Drawbacks of lamellar model, Drawbacks of Lamellar model This model ...

Drawbacks of Lamellar model This model does not explain the elasticity of PM. Although this model says that PM is elastic but it also states that head of lipid molecules is

Insulation by fur and feathers, Normal 0 false false false ...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Cytoplasmic bridge formed during the conjugation of paramoec, Cytoplasmic b...

Cytoplasmic bridge formed during the conjugation of paramoec: The two paramoecia that undergo conjugation are called conjugants. During conjugation, the two conjugants com

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd