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Human Health & Diseases in ONE SHOT for NEET 2026

Human Health & Diseases in ONE SHOT for NEET 2026 includes human health, disease classification, and pathogen mechanisms like typhoid and malaria. It explains innate and adaptive immunity, including allergies, autoimmunity, AIDS, and cancer. The physiological impacts of drug, alcohol, and tobacco abuse are detailed, emphasizing prevention and early detection for holistic well-being.

 

 

authorImagePriyanka Yadav1 Apr, 2026
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Human Health & Diseases in ONE SHOT for NEET 2026

Human Health & Diseases in ONE SHOT for NEET 2026 explores human health and diseases. It traces health concepts from ancient beliefs to modern definitions and factors influencing well-being. 

 

We classify diseases, examine pathogens, and understand the intricate immune system, including immunity types and disorders. Key diseases like AIDS, cancer, and substance abuse are discussed for a holistic understanding.

Human Health & Diseases Overview

The Human Health & Diseases in ONE SHOT for NEET 2026 chapter explains the concept of health, disease classification, and the role of pathogens in causing infections. It covers major diseases such as typhoid, pneumonia, malaria, amoebiasis, and AIDS, along with their causes, transmission, and symptoms. 

 

The chapter also explains the human immune system, including innate and adaptive immunity, antibodies, and lymphoid organs. Important topics like vaccination, immunization, allergies, and autoimmune diseases are discussed to show how the body defends itself against pathogens. It also highlights serious health issues such as cancer and the harmful effects of drug abuse and tobacco, emphasizing prevention, health awareness, and overall well-being.

 

 

Key Revision Points from Human Health & Diseases 

Regular revision is essential for mastering the chapter Human Health & Diseases, especially for exams like NEET, where conceptual clarity and quick recall are important. Revisiting key points helps students reinforce important concepts such as disease classification, pathogens, immunity, and major health disorders. It also improves memory retention and makes it easier to recall facts during examinations

Health

  • WHO Definition: Physical, mental and social well-being (not merely absence of disease)

  • Factors affecting health: Genetic disorders, infections, lifestyle habits, environmental conditions

  • Maintaining health: Balanced diet, personal hygiene, regular exercise, clean drinking water, waste disposal, vector control

Diseases

Infectious diseases:
 • Bacterial: Typhoid, Pneumonia
 • Viral: Common cold, AIDS
 • Protozoan: Malaria, Amoebiasis
 • Helminthic: Ascariasis, Filariasis
 • Fungal: Ringworm
Non-infectious diseases: Cancer, genetic disorders, lifestyle diseases

Immunity

Innate immunity: Physical barriers (skin, mucus), physiological barriers (HCl, lysozyme), cellular barriers (macrophages, neutrophils, NK cells), cytokines (interferons)
Adaptive immunity: Humoral immunity (B cells → antibodies), cell-mediated immunity (T cells → destroy infected cells)

Antibodies

Structure: Two heavy chains, two light chains, antigen-binding site
Types (GAMED): IgG, IgA, IgM, IgE, IgD

Immunization

  • Active Immunity

    • Natural infection

    • Vaccination

  • Passive Immunity

    • Colostrum

    • Placental antibodies

    • Anti-snake venom

    • Anti-tetanus serum 

Immune Disorders

  • Allergy

    • IgE-mediated response

    • Histamine release

  • Autoimmune Diseases

    • Rheumatoid arthritis

    • Myasthenia gravis

    • Psoriasis

    • Vitiligo 

Lymphoid Organs

  • Primary Lymphoid Organs

    • Bone marrow

    • Thymus

  • Secondary Lymphoid Organs

    • Spleen

    • Lymph nodes

    • Tonsils

    • MALT (Mucosa-Associated Lymphoid Tissue)

AIDS

  • Cause

    • HIV (Retrovirus)

  • Target Cells

    • CD4 T-helper cells

  • Transmission

    • Sexual contact

    • Contaminated blood

    • Shared needles

    • Mother-to-child

  • Diagnosis

    • ELISA

    • PCR

Cancer

  • Types of Tumours

    • Benign (localized)

    • Malignant (metastasis)

  • Causes

    • Physical radiation

    • Chemical carcinogens

    • Oncogenic viruses

  • Treatment

    • Surgery

    • Chemotherapy

    • Radiotherapy

    • Immunotherapy

Drug Abuse

  • Types of Drugs

    • Opioids

    • Cannabinoids

    • Coca alkaloids

  • Effects

    • Addiction

    • Withdrawal symptoms

    • Organ damage

    • Social problems 

The chapter Human Health and Diseases explains the causes, transmission, and prevention of various diseases and highlights the role of the immune system in protecting the body. It covers important diseases such as Typhoid, Malaria, and AIDS, along with concepts of immunity, cancer, and drug abuse. 

Understanding these topics helps students develop health awareness and strengthen their preparation for exams like NEET.

Human Health & Diseases FAQs

What is the modern definition of health, according to WHO?

The WHO defines health as a state of complete physical, mental, and social well-being, not merely the absence of disease or physical fitness.

How is malaria transmitted, and what are its main symptoms?

Malaria is transmitted by the bite of an infected female Anopheles mosquito, which injects sporozoites. Main symptoms are a recurring cycle of chills, high fever, headache, and sweating, typically every third or fourth day.

What are the key differences between innate and adaptive immunity?

Innate immunity is non-specific, present at birth, and involves physical, physiological, cellular, and cytokine barriers. Adaptive immunity is acquired, highly specific, diverse, discriminates self from non-self, and has memory for faster, more potent responses.

How does HIV cause immunodeficiency, leading to AIDS?

HIV primarily infects macrophages and T-helper cells. It replicates in these cells, progressively destroying T-helper cells. The decreasing number of T-helper cells severely compromises both cellular and humoral immunity, making the body vulnerable to opportunistic infections, thus leading to AIDS.
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