Reproductive Health & Endocrine System — Hormones, Family Planning & Population Policy

Overview

The endocrine system is a network of glands that produce hormones — chemical messengers regulating growth, metabolism, reproduction, and homeostasis. Understanding hormones and their disorders is essential for UPSC Prelims, while reproductive health policies (PCPNDT Act, NPP 2000, Surrogacy Regulation Act 2021) are important for both Prelims and Mains (GS-II: Social Issues). India's achievement of a Total Fertility Rate of 2.0 (NFHS-5, 2019–21) — below the replacement level of 2.1 — marks a significant demographic milestone.

Exam Strategy: For Prelims, memorise the hormone-gland-function-disorder table — questions often test specific hormones (e.g., "Which gland secretes insulin?", "What causes goitre?"). For Mains, focus on India's population policy, TFR trends, and legislative measures like the PCPNDT Act and Surrogacy Regulation Act.

The Endocrine System — Endocrine vs Exocrine Glands

Key Fact: The pancreas is both endocrine and exocrine — its Islets of Langerhans secrete hormones (insulin, glucagon) directly into the blood, while its acinar cells secrete digestive enzymes into the duodenum via the pancreatic duct.

Major Endocrine Glands and Their Hormones

Hypothalamus

• Located in the brain, below the thalamus
• Acts as the link between the nervous system and the endocrine system
• Produces releasing and inhibiting hormones that control the pituitary gland
• Regulates body temperature, hunger, thirst, sleep, and circadian rhythms

Pituitary Gland — The "Master Gland"

Located at the base of the brain (pea-sized). Called the "master gland" because its hormones regulate many other endocrine glands. However, the hypothalamus controls the pituitary, so it is sometimes called the "master of the master gland."

Anterior Pituitary Hormones:

Posterior Pituitary Hormones:

Thyroid Gland

Located in the front of the neck (butterfly-shaped). Requires iodine for hormone synthesis.

Parathyroid Glands

Four tiny glands on the posterior surface of the thyroid.

Prelims Tip: Calcitonin (thyroid) and PTH (parathyroid) have opposite effects on blood calcium. Calcitonin lowers calcium; PTH raises calcium. Together, they maintain calcium homeostasis.

Adrenal Glands

Two triangular glands sitting on top of each kidney. Each has two parts: the outer cortex and the inner medulla.

Adrenal Cortex:

Adrenal Medulla:

Key Fact: Adrenaline is called the "emergency hormone" or "fight-or-flight hormone." When you are frightened or excited, the adrenal medulla releases adrenaline, preparing the body for rapid action — heart beats faster, blood sugar rises, pupils dilate, and blood flows to muscles.

Pancreas (Endocrine Function)

The Islets of Langerhans contain two key cell types:

Gonads (Sex Glands)

Other Hormone-Producing Organs

Comprehensive Hormone Table — Gland, Hormone, Function, Disorder

Major Endocrine Disorders

Diabetes Mellitus

Thyroid Disorders

Prelims Tip: Goitre is caused by iodine deficiency — the thyroid gland swells as it tries to produce adequate hormones. This is why iodised salt is mandatory in India. The National Iodine Deficiency Disorders Control Programme (NIDDCP) promotes universal salt iodisation.

Other Important Disorders

Reproductive Health

Reproductive and Child Health (RCH) Programme

India's RCH Programme was launched in 1997 under the National Rural Health Mission (now National Health Mission). It focuses on:

• Maternal and child health
• Immunisation
• Family planning
• Adolescent health
• Implementation of the PCPNDT Act

PCPNDT Act — Ban on Sex Determination

The Pre-Conception and Pre-Natal Diagnostic Techniques (PCPNDT) Act, 1994 (amended 2003) prohibits:

• Sex determination of the foetus
• Pre-conception sex selection
• Advertisement of sex determination facilities

Family Planning Methods

Key Fact: India introduced injectable contraceptive DMPA (brand name Antara) in the public health system in 2017. It is administered once every three months and is available free at government health facilities.

India's Population Policy and TFR Trends

National Population Policy 2000 (NPP 2000)

Total Fertility Rate (TFR) Trends

Milestone: As per NFHS-5 (2019–21), India's TFR has declined to 2.0 — below the replacement level of 2.1. This means India's population will eventually stabilise and then decline (with a time lag due to population momentum). The achievement came about a decade after the NPP 2000 target year of 2010.

Replacement-level fertility (2.1) means each woman has, on average, enough children to "replace" herself and her partner in the population, accounting for child mortality.

Assisted Reproduction

In Vitro Fertilisation (IVF)

• Egg is fertilised with sperm in a laboratory dish ("test-tube baby")
• The embryo is then transferred to the uterus
• First IVF baby — Louise Brown (UK, 1978)
• First IVF baby in India — Durga (born Kanupriya Agarwal, 1978) — just 67 days after Louise Brown

Surrogacy Regulation Act, 2021

Exam Tip: The Surrogacy (Regulation) Act, 2021 and the Assisted Reproductive Technology (Regulation) Act, 2021 were passed together. The ART Act regulates ART clinics, banks, and procedures (IVF, ICSI, etc.). Both Acts aim to protect the rights of women and children involved in surrogacy and ART procedures.

Frequently Asked Questions (Prelims Pattern)

Key Terms for Quick Revision

Sources: Cleveland Clinic (Endocrine System); Johns Hopkins Medicine; PIB (pib.gov.in — India TFR, Deep Ocean Mission); PRS India (NFHS-5 Vital Stats); Wikipedia (Endocrine system, PCPNDT Act, Surrogacy in India); MOHFW (rch.mohfw.gov.in — RCH Programme); India Code (Surrogacy Regulation Act 2021).