Health and disease class 12. Views and Download PDF file 2022-10-21
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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.
NCERT Solutions For Class 12 Biology Human Health and Disease
When an antigenic material is injected into a healthy person, it generates antibodies and memory cells as primary immune response. However the DNA ofthe infected host cell does possess the viral DNA. Radiography, CT computed tomography , MRI magnetic resonance imaging are very useful to cancers of internal organs. Identify A, B, C and D. Examples — Heart Disease, Cancer, Obesity etc. What is Deficiency Diseases? Explain the process of replication of a retrovirus after it gains entry into the human body. It has a potent stimulating action on central nervous system, producing a sense of euphoria and increased energy.
Infectious diseases which easily transmit from one person to another, e. This process is called reverse transcriptase because it violates the usual way in which genetic information is transcribed. Write giving an example wherethis type of immunity should be provided to aperson. Delhi 2010 Answer: i Formation of gametocytes occurs in the erythrocytes RBCs of human beings. Lymph nodes serve to trap the microorganisms or other antigens, which happen to get intothe lymph and tissue fluid. Expand each one to its fall form: a MALT b CMI c AIDS d NACO e HIV Ans: a MALT — Mucosal Associated Lymphoid Tissue b CMI-Cell-Mediated Immunity c AIDS — Acquired Immuno Deficiency syndrome d NACO — National AIDS Control Organization e HIV — Human Immuno Deficiency Virus 8.
Human Health and Disease Class 12 Notes CBSE Biology Chapter 8 [PDF]
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. Foreign 2014 Answer: i The immunity provided to the newborn by colostrum and vaccinations is called passive immunity. All India 2012 Or Trace the life cycle of Plasmodium in humans from the stage of entry until it is picked up by the female Anopheles. It is extracted from the latex of poppy plant Papaversomniferum. Name any two cannabinoids. It is of the following types, as shown below: I.
Human Health and Disease Class 12 Important Questions and Answers Biology Chapter 8
Why do normal cells not show cancerous growth? Normal cells show a property called contact inhibition by virtue of which contact with other cells inhibit their uncontrolled growth. Health is affected by- a. If the person is taking a nutritionary deficient diet then the required amounts of nutrients are not provided to the body resulting in an unhealthy body. They react to organ transplant. Tumors are of two types: Benign or non-malignant tumors these remain confined to one place and cause little damage, cancerous or malignant tumors — these are a mass of proliferating cells known as neoplastic cells. Mention the useful as well as the harmful drug obtained from the latex of poppy plant. Preformed antibodies help in providing quick immune response.
Human Health and Diseases Questions Class 12 Biology
Direct contact with the pathogens that have entered inside D. Because reverse transcriptase lacks thg proofreading function that most DNA synthesizing enzymes have, many mutations arises as the virus replicates, further hindering the ability of the immune system to combat the virus. Refer to Answer No. All India 2014 Or When does a human body elicit an anamnestic response? Answer the questions that follows. HIV multiplies first in macrophages and then inhelper T cells or lymphocytes.
NCERT Book Class 12 Biology Chapter 8 Human Health and Disease
As a result, the normal growth of the cells may be transformed into cancerous one. Infectious Diseases —Those diseases that can be transferred easily from one person to another are called infectious diseases. The pathogens are transmitted through the bite of female mosquito vectors. There are various programs conducted by WHO to prevent AIDS from spreading. Examples — Anti-Tetanus injection, Injections for snake bite, colostrum yellowish fluid produced by the mother in the initial days of lactation contains abundant IgA antibodies to protect the infant against infections.
These cells have the ability to invade or spread to other parts of the body by travelling through the blood stream or the lymphatic system — metastasis. Answer: After infecting the human body, the HIV gains entry into macrophages. It also increases the craving for hard drugs. It may enter the skin through a cut or puncture wound. Health may be defined as a state of the body when all the organs and systems are functioning properly and a perfect balance is maintained between the environment and the body.
Human Health and Disease for Class 12 Chapter 8 Biology Notes
Instead these cells become immature overtime. How does it affect the body of the abuser? To satiate their needs the person will ignore all the social norms and may even choose the wrong path leading to social problems. No memory cells are produced and thus log term immunity is not provided. Once bacteria is under the skin, it makes a toxin that causes severe and painful muscle spasms, which can even be fatal. It is seen in groin, between the toes etc. These protect the healthy cells from the virus attacks. You can refer to the Vedantu learning app for study materials that will give you the exact idea of Chapter 8 of Class 12 Biology at free of cost.