Life Cycle of Plasmodium
Stages Involved
- Exoerythrocytic stage- It occurs in the liver of the infected person.
- Erythrocytic stage- It occurs in the RBCs of the infected person.
- Sporogonic stage- It occurs in the female mosquito, i.e. Anopheles
Steps Involved
- Infected plasmodium enters the human body by a bite of an infected female anopheles mosquito (transmitting agent or vector)
- The plasmodium multiplies in the liver cells or hepatocytes and affect the RBCs which rupture later as a result, hemozoin (toxic) is released which causes a high fever and chills for three to four days.
- Multiplied plasmodium enters the body of a mosquito when Anopheles bites the infected person and starts multiplying within the body and forms sporozoites (stored in salivary glands).
- When these mosquitoes bite a human, those sporozoites enter the human body and the cycle repeats.
NCERT Notes on Class 12 Biology Chapter 7 – Human Health and Disease
NCERT Chapter 7 of Class 12 Notes on Human Health and Disease: According to the World Health Organisation, health can be defined as a state of complete physical, mental, and social well-being and not merely the absence of disease and infirmity. Good health has many benefits like it helps to keep us happy. Our skin, teeth, and eyes remain healthy, support muscles, enhance immunity, strengthen bones, and lower the risk of heart ailments, diabetes, and some cancers. It also supports healthy pregnancies and breastfeeding among women.
NCERT Notes on Chapter 7 Human Health and Disease: On the other hand, disease is any undesirable change in our body that may keep us disturbed whether it is physical, mental, or social. Our body can undergo a number of changes like any of the organs can stop functioning in a proper way which can also be associated with some other signs and symptoms. In plants and animals, the disease can also be occurred by pathogens, i.e. disease-causing organisms such as fungi, bacteria, viruses, protozoa, and certain types of invertebrates like tapeworms, wuchereria. Unhygienic surroundings, nutritional deficiencies, and unhealthy lifestyles also cause diseases.
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