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

Spironolactone, Aldosterone mediates myocardial remodeling and fibrosis, as...

Aldosterone mediates myocardial remodeling and fibrosis, as well as sodium retention and potassium loss at the distal tubules. The anti-aldosterone agent, spironolactone   has been

Explain risk assessment, Explain Risk Assessment Risk Assessment   :  ...

Explain Risk Assessment Risk Assessment   :  The scientific evaluation  of  known  or  potential adverse  health effects  resulting  from  human exposure to food borne hazards

Define the dietary recommendations for epilepsy, Define the Dietary Recomme...

Define the Dietary Recommendations for epilepsy? A 3: 1 ketogenic diet is recommended. The time taken for reversing the usual ratio of 1:3 to 3: 1 is about 4 days. How will we

Explain the advantages of double beam method, Explain the Advantages of Dou...

Explain the Advantages of Double Beam Method? The double beam method has advantage over single beam as it automatically corrects, for the change in light transmission, through

What is diagnostic wax up, Diagnostic Wax Up A diagnostic wax up should...

Diagnostic Wax Up A diagnostic wax up should be done by you or got done from a laboratory for each and every case regardless of the extent or difficulty level of the case as it

Define some food related problems in parkinson''s disease, Define Some Food...

Define Some Food Related Problems in parkinson's disease? As the disease progresses some food related difficulties appear. These are: 1. Difficulty in food preparation

Define trauma - nutrition during stress, Define Trauma - Nutrition During S...

Define Trauma - Nutrition During Stress? The term "trauma" conies from a Greek word which means "a wound" (and or damage or defect). Trauma is a form of shock to the human body

Determine some food sources of chromium, Determine some Food Sources of chr...

Determine some Food Sources of chromium? Chromium occurs in trivalent form in foods. Good sources of chromium include whole grains, spices and condiments, meats especially orga

How is the nervous system of molluscs organized, How is the nervous system ...

How is the nervous system of molluscs organized? Molluscs have well-developed sensory structures. It is established that cephalopods, such as squid and octopus, have eyes with

Physiological regeneration, Physiological Regeneration This type of r...

Physiological Regeneration This type of regeneration is a regular physiological function including the continuous replacements of cells and tissues, and thus is indispensible

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