Health and disease class 12. Views and Download PDF file 2022-10-27

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Health is a state of physical, mental, and social well-being in which an individual is able to lead a fulfilling and productive life. It is not just the absence of disease or infirmity, but rather a positive state of overall functioning. Good health is essential for an individual to lead a happy and fulfilling life.

On the other hand, disease is a condition that disrupts an individual's normal functioning and causes a negative impact on their health. It can be caused by a variety of factors, including genetics, environmental factors, and lifestyle choices. Some diseases are acute, meaning they have a sudden onset and are typically short-lived. Others are chronic, meaning they are long-term conditions that require ongoing management.

There are many ways to maintain good health and prevent the onset of disease. These include eating a healthy and balanced diet, getting regular exercise, getting enough sleep, and avoiding risky behaviors such as smoking and excessive alcohol consumption. Regular check-ups with a healthcare provider can also help to identify potential health issues early on and allow for timely treatment.

There are many different types of diseases, ranging from infectious diseases such as the flu or pneumonia, to chronic conditions such as diabetes or heart disease. Some diseases are caused by pathogens, which are microorganisms such as bacteria or viruses that invade the body and cause illness. Others are caused by non-infectious factors such as genetics, lifestyle choices, and environmental factors.

Treatment for diseases can vary widely depending on the specific condition. Some diseases can be cured with a course of medication, while others may require ongoing management through lifestyle changes or ongoing treatment. In some cases, diseases may be terminal, meaning they cannot be cured and will eventually result in death.

In conclusion, health is a crucial aspect of an individual's overall well-being, and maintaining good health can help to prevent the onset of disease. There are many factors that can contribute to good health, including a healthy lifestyle and regular check-ups with a healthcare provider. While diseases are a natural part of life, there are many ways to manage and treat them, allowing individuals to lead fulfilling and productive lives.

Human Health and Disease Class 12 Notes Biology Chapter 8

health and disease class 12

AIDS Full form of AIDS is Acquired Immuno Deficiency Disorder. What is Deficiency Diseases? Due to repeated use of drugs they are now highly tolerant towards large amounts of drug doses. How does malaria differ from chikungunyawith reference to their vectors. Mosquitoes spread dengue and malaria. Minerals are inorganic nutrients that include trace elements such as copper, zinc, iodine, iron, along with the macronutrients such as calcium, potassium, magnesium and sodium.

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Human Health and Diseases Questions Class 12 Biology

health and disease class 12

In males: acne, mood swings, aggressiveness, depression, decreased sperm production, reduction in testicles, kidney and liver dysfunction, premature baldness, breast enlargement, enlargement of the prostate. Name the drug that can reduce the symptoms of allergy? It is also known as the Jock itch. For more updates, keep logging on. Elephantiasis or filariasis Wuchereria W. Why is the structure of an antibody molecule represented as HgLa? Valium Barbiturates Depress brain activity and produce feelings of calmness relaxation, drowsiness, and deep sleep high doses.

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Important Questions Human Health and Diseases Class 12 Biology

health and disease class 12

Which plant yields cannabinoids? The plasmid vaccine carrying the DNA gene enters the nucleus of target cells and produces RNA, and in turn the specific antigenic protein, because these proteins are recognized as foreign. Ans: Yes, friends can influence one to take drugs. Parasite multiply within lever cells and then attack the RBCs. Coca alkaloids or Cocaine Coca Plant Erythroxylum coca Snorted It interferes with the Dopamine neurotransmitter transportation and also effect the CNS by producing a sense of euphoria and increased energy. It acts as a filter to trap blood-borne microbes and contain a large pool of erythrocytes. In our body, the growth and differentiation of cells is highly controlled and regulated.

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Human Health and Diseases Class 12 Biology Notes

health and disease class 12

State two different roles of spleen in the humanbody. There is always time lag between infection and appearance of symptoms that may vary from 5-10 years. Genetic Information: There are several genetic abnormalities and disorders that are inherited from the parents to their offspring, thus genetic material is also responsible for the healthy state of the body. Mention their carcinogenic effects. All India 2015 Answer: Retroviruses have RNA as their genetic material. Here you can readChapter 8 of Class 12 Biology NCERT Book. No memory cells are produced and thus log term immunity is not provided.

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Important Questions For Class 12 Biology Chapter 8

health and disease class 12

It is caused by HIV human Immuno deficiency virus , a retrovirus. Health is affected by- a. In what way is monocyte a cellular barrier with reference to immunity? Haemozoin causes chill and high fever recurring every 3-4 days. Please refer to Important Questions Human Health and Diseases Class 12 Biology below. Name the part of the body that is affected by its consumption. This is called passive immunisation.


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Views and Download PDF file

health and disease class 12

They directly attach the antigen or direct B-cells to produce antibody. Human immune system can distinguish between self and foreign molecules or foreign bodies. Mention their effects on human body. MRI gives a better contrast of softer tissues compared to CT but cannot be used on patients with metal implants and pacemakers. These are — i Physical barriers: Examples - Skin, gastrointestinal, mucus coating of the epithelium lining the respiratory, and urogenital tracts. Treatment of Cancer: Treatment of cancer can be done by one or a combination of different approaches. OR From which plant are cannabinoids obtained? Answer :The chemicals like histamine and serotonin arereleased from mast cells.

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Human Health and Diseases Class 12

health and disease class 12

The important minerals required by our body are calcium, chloride, magnesium, phosphorus, potassium, sodium and sulphur. Withdrawal symptoms are characterised by anxiety, shakiness, nausea and sweating. CBSE Class 12 Biology Revision Notes and Key Points CBSE Class Biology Human Health And Disease Revision notes are very helpful for students to revise all the topics covered in a chapter in a short time during exam days. Mention the body parts affected by them. How is a cancer cell different from normal cell? Delhi 2015C Answer: i When the RBCs infected with malarial parasites burst open, they release a toxic substance called haemozoin, which is responsible for the chill and high fever recurring every three to four days.


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Human Health and Disease class 12 Notes Biology

health and disease class 12

How do monocytes act as a cellular barrier in humans to provide innate immunity? How HIV Affects the Body? The figure shows the aids virus. Butcancer cells appear to have lost this property which results in their uncontrolled growth and multiplication. It acts on many organisms and does not show specificity, e. When the body cells lose this property and show an abnormal growth with a breakdown of the regulatory mechanism in the cells, then it leads to mass of continuously growing cells. Primary and secondary responses are carried out with the help of B-lymphocytes and T-lymphocytes. In this period no symptoms are produced in the human body. They are called humoral immune response due to presence in blood.


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Human Health and Disease Class 12 Notes CBSE Biology Chapter 8 [PDF]

health and disease class 12

State why an antibody is represented as H2L2. It is a depressant and slows down body functions. A schematic diagram showing the cycle of proliferation and effects of retrovirus HIV in infected person is as follows Question 62. As a result of this, fluid accumulates in the tissue which swells up. Common examples of allergens are outdoor pollutants including ozone and diesel exhaust, indoor pollutants such as tobacco smoke and nitrogen dioxide, microbial products, mites in dust, pollens, animal dander, etc. AIDS or Acquired Immuno Deficiency Syndrome was first reported in 1981 in USA. This virus is transmitted through contact with the infected blood, semen, or vaginal fluids.

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Human Health and Disease for Class 12 Chapter 8 Biology Notes

health and disease class 12

Answer : Ascariasis is a helminthic disease caused by common round worm — Ascaris lumbricoides. All India 2016 Or How do macrophages in the human body act as HIV factory? These cells reach another place through blood and form new tumors. These cells show contact inhibition. Briefly explain any two. Thymus provides the microenvironment for immature lymphocytes to differentiate into antigen-sensitive lymphocytes. The protective chemicals proteins produced by the body in response to antigens are called antibodies.

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