What are the primary hormones produced by the testes and ovaries, and what are their main functions?

The testes primarily produce androgens, with testosterone being the most significant. Testosterone is crucial for spermatogenesis, the development of male secondary sexual characteristics (like deep voice, body hair, muscle mass), and the maintenance of male reproductive organs. The ovaries produce estrogens (mainly estradiol) and progesterone. Estrogens are responsible for oogenesis, female secondary sexual characteristics (like breast development, wider hips), and uterine proliferation. Progesterone prepares the uterus for pregnancy and maintains it, also supporting mammary gland development.

How is the secretion of hormones from the testes and ovaries regulated?

The secretion is regulated by the Hypothalamic-Pituitary-Gonadal (HPG) axis. The hypothalamus releases GnRH, which stimulates the anterior pituitary to release LH and FSH. LH stimulates Leydig cells in testes to produce testosterone and theca/luteal cells in ovaries to produce precursors for estrogen/progesterone. FSH stimulates Sertoli cells in testes for spermatogenesis and granulosa cells in ovaries for follicular development and estrogen production. These gonadal hormones then exert negative feedback on the hypothalamus and pituitary, except for a brief positive feedback by high estrogen leading to the LH surge in females.

What specific cells in the testes and ovaries are responsible for hormone production?

In the testes, the Leydig cells (interstitial cells) are the primary producers of androgens like testosterone, under the influence of LH. Sertoli cells, though not directly producing steroid hormones, secrete inhibin. In the ovaries, the granulosa cells and theca interna cells of developing follicles produce estrogens, stimulated by FSH and LH respectively. After ovulation, the corpus luteum, formed from the ruptured follicle, becomes the main source of progesterone and some estrogen.

What is the role of inhibin in both males and females?

Inhibin is a hormone produced by Sertoli cells in the testes and granulosa cells in the ovaries. Its primary role in both sexes is to selectively inhibit the secretion of Follicle-Stimulating Hormone (FSH) from the anterior pituitary gland. This provides a negative feedback mechanism. In males, it helps regulate the rate of spermatogenesis, while in females, it modulates follicular development and estrogen production by controlling FSH levels, preventing excessive follicular growth.

Besides reproduction, what other physiological effects do gonadal hormones have?

Gonadal hormones have widespread effects beyond reproduction. Testosterone in males promotes muscle and bone growth, increases red blood cell production, and influences behavior and libido. Estrogens in females are crucial for maintaining bone density, cardiovascular health, and influencing fat distribution. Both testosterone and estrogens impact mood, cognitive function, and overall metabolic rate. Progesterone also affects body temperature and has a calming effect on the nervous system, particularly during pregnancy.

← ALL TOPICS

Biology

NEXT TOPIC →

Endocrine Glands and Hormones

Testis and Ovary

Biology

NEET UG

Version 1Updated 22 Mar 2026

Explore This Topic

Definition Deep Explanation Core Principles NEET Importance Problem Strategy Practice Problems MCQ Practice Quick Revision

The testes in males and ovaries in females are the primary reproductive organs, also known as gonads. Beyond their crucial role in producing gametes (sperm and ova, respectively), they function as vital endocrine glands. These glands secrete a diverse array of steroid hormones, primarily androgens (like testosterone) from the testes and estrogens (like estradiol) and progestins (like progesterone)…

Quick Summary

The testes in males and ovaries in females are the primary reproductive organs, known as gonads, performing a dual function: producing gametes (sperm and ova) and secreting vital steroid hormones. Testes, located in the scrotum, produce testosterone from Leydig cells, which drives male sexual development, secondary characteristics, and spermatogenesis.

They also produce inhibin from Sertoli cells, regulating FSH. Ovaries, located in the pelvic cavity, produce estrogens (like estradiol) and progesterone from follicular cells and the corpus luteum. Estrogens govern female sexual development, secondary characteristics, and uterine proliferation, while progesterone prepares and maintains the uterus for pregnancy.

Both glands are under the control of the Hypothalamic-Pituitary-Gonadal (HPG) axis, where GnRH from the hypothalamus stimulates LH and FSH release from the anterior pituitary, which in turn regulate gonadal hormone production.

These hormones then exert feedback on the pituitary and hypothalamus, maintaining hormonal balance crucial for reproductive health and overall physiology.

Vyyuha

Your 6-Month Blueprint, Updated Nightly

AI analyses your progress every night. Wake up to a smarter plan. Every. Single.…

Key Concepts

Hypothalamic-Pituitary-Gonadal (HPG) Axis

The HPG axis is a neuroendocrine pathway that controls the function of the gonads. It begins with the…

Dual Endocrine and Gametogenic Functions of Gonads

The testes and ovaries are unique in that they perform two distinct, yet interconnected, vital functions.…

Specific Roles of LH and FSH in Gonadal Regulation

While both LH and FSH are gonadotropins released by the anterior pituitary, they have distinct target cells…

Testis: — Leydig cells

ightarrow

Testosterone; Sertoli cells

ightarrow

Inhibin, ABP.

Ovary: — Follicles

ightarrow

Estrogens; Corpus Luteum

ightarrow

Progesterone, Estrogens; Granulosa cells

ightarrow

Inhibin.

Testosterone: — Spermatogenesis, male secondary characteristics, accessory organ development.

Estrogens: — Oogenesis, female secondary characteristics, uterine proliferation.

Progesterone: — Uterine secretory phase, pregnancy maintenance, mammary development.

HPG Axis: — Hypothalamus (GnRH)

ightarrow

Anterior Pituitary (LH, FSH)

ightarrow

Gonads (Sex Hormones).

LH: — Stimulates Leydig cells; Triggers ovulation, forms corpus luteum.

FSH: — Stimulates Sertoli cells; Stimulates follicular growth.

Inhibin: — Negative feedback on FSH.

For male hormones and cells: Look Through Seminiferous Tubules for Inhibin.

Leydig cells

ightarrow

Testosterone

Sertoli cells

ightarrow

Inhibin

For female hormones and their uterine effects: Every Pregnancy Starts Proliferating.

Estrogen

ightarrow

Proliferative phase

Progesterone

ightarrow

Secretory phase

← ALL TOPICS

Biology

NEXT TOPIC →

Endocrine Glands and Hormones