Birth Control, Contraception and Medical Termination of Pregnancy (MTP)- exam ready notes

 

Birth Control, Contraception and Medical Termination of Pregnancy (MTP)

Based on NCERT Biology Class XII (Reproductive Health), standard physiology texts, and reproductive medicine concepts.

Birth control and contraception form one of the most frequently tested areas in NEET Biology. Questions are commonly asked regarding types of contraceptives, mechanisms of action, advantages, limitations, IUDs, oral pills, emergency contraception, sterilization, and MTP.

1. Introduction

Definition

Birth control refers to deliberate prevention of conception and pregnancy through various natural, mechanical, chemical, hormonal, or surgical methods.

Birth control is the regulation of fertility to:

• Prevent unwanted pregnancies
• Space children
• Limit family size
• Improve maternal and child health
• Control population growth

Contraception

The methods used for birth control are called contraceptive methods, and the process is called contraception.

2. Need For Birth Control

A. Population Explosion

Rapid increase in human population creates several problems:

• Food shortage
• Poverty
• Unemployment
• Environmental degradation
• Housing problems
• Pressure on healthcare facilities
• Resource depletion

India was among the first countries to launch national family-planning programs in 1951. These later evolved into broader Reproductive and Child Health (RCH) programs.

B. Maternal Health

Frequent pregnancies may cause:

• Maternal malnutrition
• Anemia
• Increased maternal mortality
• Pregnancy complications

C. Child Health

Birth spacing:

• Improves infant survival
• Improves nutrition
• Reduces infant mortality

D. Socioeconomic Benefits

• Better education opportunities
• Improved standard of living
• Financial stability
• Women's empowerment

3. Characteristics of an Ideal Contraceptive

An ideal contraceptive should be:

✓ User-friendly

✓ Easily available

✓ Effective

✓ Reversible

✓ Least side effects

✓ Should not interfere with sexual desire or sexual act

4. Contraceptive Methods

Classification

A.    Natural Methods

B.    Barrier Methods

C.    Intrauterine Devices (IUDs)

D.    Hormonal Methods

E.    Emergency Contraception

F.     Surgical Methods (Sterilization)

5. Natural Methods of Contraception

These methods prevent meeting of sperm and ovum.

A. Periodic Abstinence (Rhythm Method)

Principle

Avoid sexual intercourse during fertile period.

Fertile Period

In a 28-day menstrual cycle:

• Ovulation occurs around Day 14.
• Fertile period ≈ Days 10–17.

Therefore, coitus is avoided during this period.

Advantages

• No cost
• No devices
• No hormones

Disadvantages

• Less reliable
• Requires cycle tracking

B. Withdrawal Method (Coitus Interruptus)

Principle

Penis is withdrawn from vagina before ejaculation.

Advantage

Simple method.

Limitation

Pre-ejaculatory fluid may contain sperms. Therefore, failure rate is relatively high.

C. Lactational Amenorrhea

Definition

Absence of menstruation during breastfeeding period.

Mechanism

High prolactin levels:

• Suppress ovulation
• Prevent conception

Effective Period

Approximately first 6 months after childbirth if exclusive breastfeeding occurs.

6. Barrier Methods

These physically prevent sperm from reaching the ovum.

A. Male Condom

Mechanism

Acts as physical barrier preventing sperm entry into female reproductive tract.

Advantages

• Easily available
• Inexpensive
• No hormonal side effects
• Protection against many STIs including HIV/AIDS

Limitation

May tear or slip if used improperly.

B. Female Condom

Inserted into vagina before intercourse.

Provides:

• Contraception
• Protection from STIs

C. Diaphragms

Structure

Dome-shaped rubber cups.

Position

Placed over cervix before intercourse.

Action

Prevent sperm entry into uterus.

D. Cervical Caps

Fit tightly over cervix.

Act as mechanical barriers.

E. Vaults

Placed in vaginal canal.

Often used with spermicidal creams.

7. Chemical Barriers (Spermicides)

Examples:

• Spermicidal creams
• Jellies
• Foams
• Tablets

Mechanism

Kill or immobilize sperms. Usually used along with:

• Diaphragms
• Cervical caps

8. Intrauterine Devices (IUDs)

Definition

Devices inserted into uterus by trained medical personnel. These are among the most effective reversible contraceptive methods.

Types of IUDs

A. Non-medicated IUDs

Example:

• Lippes Loop

B. Copper-Releasing IUDs

Examples:

• Cu-T
• Cu-7
• Multiload-375

Mechanism

Copper ions:

• Suppress sperm motility
• Reduce fertilizing capacity of sperm
• Increase phagocytosis of sperms

C. Hormone-Releasing IUDs

Examples:

• Progestasert
• LNG-20

Mechanism

• Thicken cervical mucus
• Alter endometrium
• Prevent implantation

Advantages of IUDs

• Highly effective
• Long-term protection
• Reversible
• Convenient

9. Hormonal Contraceptives

A. Oral Contraceptive Pills (OCPs)

Composition

Contain:

• Estrogen
• Progesterone
  OR
• Progesterone only

Mechanism

Hormones inhibit:

• FSH secretion
• LH surge
• Ovulation

Also:

• Thicken cervical mucus
• Alter uterine lining

Usage Pattern

Generally taken for:

• 21 days
• Starting within first 5 days of menstrual cycle

Then a pill-free interval follows.

Advantages

• Highly effective
• Reversible
• Convenient

Limitations

• Must be taken regularly
• Hormonal side effects may occur

B. Injectable Contraceptives

Examples: DMPA (Depot Medroxyprogesterone Acetate). Provide long-duration contraception.

C. Hormonal Implants

Placed under skin. Release hormones slowly for years.

D. Saheli

Important Fact

Developed by: Central Drug Research Institute

Characteristics:

• Non-steroidal oral contraceptive
• Once-a-week pill
• Indigenous Indian contraceptive

10. Emergency Contraception

Definition

Methods used after unprotected intercourse to prevent pregnancy.

Time Limit

Most effective within 72 hours after intercourse.

Indications

• Condom rupture
• Sexual assault
• Missed contraceptive pills
• Unprotected intercourse

Methods

Emergency Pills

High-dose hormones prevent:

• Ovulation
• Fertilization
• Implantation

11. Surgical Methods (Sterilization)

Permanent methods of contraception.

A. Vasectomy (Male Sterilization)

Procedure

Small segment of: Vas deferens is cut and tied.

Effect

• Sperms absent in semen.
• Testosterone production continues normally.

B. Tubectomy (Female Sterilization)

Procedure

Small portion of: Fallopian tube (oviduct) is cut and tied.

Effect

Prevents meeting of sperm and ovum.

Comparison

Feature	Vasectomy	Tubectomy
Performed in	Male	Female
Structure cut	Vas deferens	Fallopian tube
Complexity	Simpler	More complex
Permanence	Permanent	Permanent

12. Medical Termination of Pregnancy (Mtp)

Definition

Intentional or voluntary termination of pregnancy before full term. Also called: Induced Abortion

13. Why Is MTP Done?

1. Unwanted Pregnancy

May result from:

• Contraceptive failure
• Unprotected intercourse
• Casual sexual relations

2. Pregnancy Following Rape

Helps reduce physical and psychological trauma.

3. Threat to Mother's Life

Examples:

• Severe cardiac disease
• Serious medical disorders

4. Serious Fetal Abnormalities

When fetus has severe congenital defects.

14. MTP In India

Government of India legalized MTP in: 1971 under specific conditions to prevent unsafe abortions and reduce maternal mortality.

15. Safest Period For MTP

Most safe: First Trimester (up to 12 weeks). Risk increases substantially in second trimester.

16. Risks Of Unsafe Abortion

Illegal abortions may lead to:

• Excessive bleeding
• Infection
• Infertility
• Maternal death

Therefore, MTP should always be performed by qualified medical professionals.

17. MTP Is Not a Regular Contraceptive Method

Important NEET Concept

MTP:

✗ Not a routine contraceptive method

✓ A medical procedure used under special circumstances

Repeated abortions may adversely affect reproductive health.

18. Female Foeticide and Amniocentesis

Amniocentesis

Prenatal diagnostic technique used to detect:

• Chromosomal abnormalities
• Genetic disorders

Examples:

• Down syndrome
• Genetic defects

Misuse

Used illegally for:

• Sex determination
• Female Foeticide

Therefore, prenatal sex determination is prohibited in India.

19. HIGH-YIELD NEET FACTS

Topic	Fact
Family planning program in India	Started in 1951
Fertile period	Days 10–17
Lactational amenorrhea	Effective for ~6 months
Copper IUD action	Decreases sperm motility
Hormonal pills	Prevent ovulation
Emergency contraception	Within 72 hours
Vasectomy	Vas deferens cut
Tubectomy	Fallopian tubes cut
MTP legal in India	Since 1971
Safest MTP period	First trimester
Saheli	Once-weekly non-steroidal pill
STI protection	Condoms only among contraceptive methods

Exam Pearls

1. Copper-T suppresses sperm motility and fertilizing capacity.
2. Hormonal contraceptives inhibit ovulation.
3. Lactational amenorrhea is effective only during intense breastfeeding.
4. Vasectomy does not affect testosterone production.
5. Tubectomy prevents sperm-ovum meeting.
6. MTP is safest during the first trimester.
7. Condoms provide dual protection: contraception + STI prevention.
8. IUDs are among the most effective reversible contraceptives.
9. India launched family planning programmes in 1951.
10. Saheli is an indigenous Indian oral contraceptive.

One-Minute Revision Sheet

Birth Control → Prevention of pregnancy

Natural Methods

• Periodic abstinence
• Withdrawal
• Lactational amenorrhea

Barrier Methods

• Condoms
• Diaphragms
• Cervical caps

IUDs

• Lippes Loop
• Cu-T
• Cu-7
• Multiload 375
• LNG-20

Hormonal Methods

• Oral pills
• Injectables
• Implants
• Saheli

Emergency Contraception

• Within 72 hours

Surgical Methods

• Vasectomy
• Tubectomy

MTP

• Induced abortion
• Legal in India since 1971
• Safest during first trimester
• Done for unwanted pregnancy, rape, maternal/fetal risk