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NEET Exam  >  NEET Notes  >  Biology Class 12  >  Important Diagrams: Human Health and Diseases

Important Diagrams: Human Health and Diseases

Human health and sickness are really important parts of being a human. They're closely connected to how our bodies work, where we live, and how we interact with others. Being healthy isn't just about not being sick; it's about feeling good physically, mentally, and socially.

Understanding the basic structures and processes through diagrams is useful for NEET aspirants in solving questions and deeper concept clarity. some of the important diagrams of this chapter are given below. 


Common Diseases in Humans

Stages in the life cycle of PlasmodiumStages in the life cycle of Plasmodium

Acquired Immunity

Acquired Immunity

Structure of an antibody molecule

 

Immune System in the Body

Immune System in the Body

Diagrammatic
representation
of Lymph nodes

AIDS

Replication of retrovirusReplication of retrovirus

Drugs

Chemical structure of MorphineChemical structure of Morphine

Opium PoppyOpium Poppy

Skeletal structure of cannabinoid moleculeSkeletal structure of cannabinoid molecule

Leaves of Cannabis SativaLeaves of Cannabis Sativa

Flowering Branch of DaturaFlowering Branch of Datura

Diagram Based Questions- NEET

Q11: The infectious stage of plasmodium that enters the human body is :     (NEET 2020)
(a) Female gametocytes
(b) Male gametocytes
(c) Trophozoites 
(d) Sporozoites

Ans. (d)

Solution. 

The life cycle of plasmodium that infects humans follows three stages:

Life Cycle of PlasmodiumLife Cycle of Plasmodium(i) infection of a human with sporozoites 

(ii) asexual reproduction

(iii) sexual reproduction.

The two first take place exclusively in the human body, while the third one starts in the human body and is completed into the mosquito organism. The human infection begins when an infected female anopheles mosquito bites a person and injects infected with sporozoites saliva into the blood circulation i.e., the first life stage of plasmodium (stage of infection).

The document Important Diagrams: Human Health and Diseases is a part of the NEET Course Biology Class 12.
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FAQs on Important Diagrams: Human Health and Diseases

1. What is the structure of an antibody?
Ans. An antibody is composed of four polypeptide chains - two heavy chains and two light chains, all linked together by disulfide bonds. The basic unit of an antibody is called a monomer, which consists of two identical heavy chains and two identical light chains.
2. What is the lifecycle of a retrovirus?
Ans. The lifecycle of a retrovirus involves several stages: attachment and entry into the host cell, reverse transcription of viral RNA into DNA, integration of viral DNA into the host genome, transcription and translation of viral genes, assembly of new viral particles, and release of mature virions from the host cell.
3. What is the life-cycle of Plasmodium vivax?
Ans. The life-cycle of Plasmodium vivax, the parasite responsible for causing malaria, involves both human and mosquito hosts. In humans, the parasite infects liver cells, undergoes replication, and then infects red blood cells, leading to symptoms of malaria. Mosquitoes become infected when they feed on an infected human, allowing the parasite to complete its life-cycle.
4. How does the immune system respond to antibodies?
Ans. When an antibody binds to a foreign antigen, it can activate various immune responses, such as neutralization of the antigen, opsonization to enhance phagocytosis, and activation of the complement system. These responses help the immune system to eliminate the foreign invader.
5. How do antibodies provide immunity against pathogens?
Ans. Antibodies play a crucial role in the immune response by recognizing and binding to specific antigens on pathogens, marking them for destruction by other immune cells. Through this mechanism, antibodies help the immune system to neutralize or eliminate pathogens, providing immunity against future infections.
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Apr 14, 2026 Last updated
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Document Description: Important Diagrams: Human Health and Diseases for NEET 2026 is part of Biology Class 12 preparation. The notes and questions for Important Diagrams: Human Health and Diseases have been prepared according to the NEET exam syllabus. Information about Important Diagrams: Human Health and Diseases covers topics like and Important Diagrams: Human Health and Diseases Example, for NEET 2026 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Important Diagrams: Human Health and Diseases.
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