notes of why do we fall I'll class-9
please please tomorrow is my exam please
Answers
Explanation:
Health
Health is a complete state of physical, mental and social well-being.
The Immune System
An immune system is the part of the body that provides protection against infection from pathogens, invading foreign substances and other toxins.
Skin and Mucous Membranes
Skin and Mucous membranes act as the layer of defence. While skin protects the body externally, mucous membrane protects the insides of the body.
The Immune System
An immune system is the part of the body that provides protection against infection from pathogens, invading foreign substances and other toxins.
Skin and Mucous Membranes
Skin and Mucous membranes act as the layer of defence. While skin protects the body externally, mucous membrane protects the insides of the body.
WBC
WBC- White blood cells are called Leucocytes or Leukocytes. They are the important components of our immune system and are present in the blood and lymph. They function by attacking and kill the pathogens and protect our body free from pathogens and infections. There are of different types of and are classified based on the location as well. The different types of White blood cells found in the blood are neutrophils, lymphocytes, monocytes, basophils, ad eosinophils. These blood cells have specialized functions.
Macrophages and NK Cells
Macrophages are large and specialized cells of the immune system. These cells are produced in response to infections or due to the development of damaged or dead cells. They attack cancer cells through destruction and ingestion. Natural Killer Cells bind to the enemy cell and they dissolve the membrane so the cell can’t function.
Dendritic Cells
Dendritic cells create the memory and carry information about the pathogens to the liver, spleen, lymph nodes.
Inflammatory Response
An inflammatory response is seen in the body when it gets injured or infected by a pathogen. Inflammations help in the localization of the issue and prevent it from spreading.
Diseases
A disease is a discomfort the body experiences physically or mentally. A disease could be caused due to external or internal factor. The two types of disease are:
Acute Diseases
Acute diseases are those which last for a very short time. These diseases can be fatal and are usually caused by an external agent.
Chronic Diseases
Chronic diseases are those which last for a long time. They take a lot of time to heal and can be caused by any external or internal factor.
Symptoms and signs of Diseases
When the body gets diseased, it shows certain symptoms and signs of illness. These symptoms and signs help in identification and diagnosis of the disease. A symptom is felt by the affected person while signs can be detected by another person. A symptom is thus, subjective and a sign is an objective.
Causes of Disease
Different types of Causes of Disease
Diseases can be caused due to pathogens such as virus or bacteria. Some diseases can also be due to internal factors such as genetic mutation.
Infectious Diseases
Diseases that are caused by pathogens and can spread to other individuals in the populations are called infectious diseases.
Non-infectious diseases
Diseases that cannot spread from one individual to another are called non-infectious diseases. Usually, these diseases are not caused by a pathogen.
Pathogens
Pathogens are external agents that cause diseases in other organisms. This pathogen includes harmful microbes or microorganism such as bacteria, virus, fungi or protozoa.
Vector
Vectors are those organisms that carry a pathogen from the host to a recipient. Mosquito, rats and mice are some of the common vectors that carry infectious diseases.
Bacteria
Bacteria are microorganisms that are seen in almost all environmental condition. Not all bacteria are harmful to pathogens. Some bacteria are also beneficial to human beings. Bacteria are beneficial for, digestion, extracting antibiotics from them, nitrogen fixation, etc.
A few of the common diseases caused by bacteria are cholera, typhoid, pneumonia, tuberculosis, etc.
Virus
A virus is a microorganism that is always pathogenic in nature. They do not have to replicate machinery. Therefore, they enter the host cell and replicate and in the process destroy the host cell. A few of the common diseases spread by the viruses are cold, influenza, dengue fever AIDS, etc.
Fungi
Fungi are a group of organisms which are eukaryotic in nature and saprophytic in nutrition. They could be either unicellular or multicellular organism. Many common skin infections such as ringworm, nail infection, etc are examples of Fungal diseases
Parasites
A parasite is an organism that lives in another organism, called the host, and often harms it. It is dependent on its host for survival – it has to be in the host to live, grow and multiply.
Infections
AIDS
AIDS stands for Acquired Immunodeficiency Syndrome. It is caused by the Human Immunodeficiency Virus. AIDS systematically destroys the immune system of the patient, leaving them vulnerable to the easiest of the diseases.
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Why do we fall ill?
What is health?
The state of living free from any illness and injury along with physically, mentally, socially well maintained.
What is a disease?
When a person is not in fair health, with a known root cause of the discomfort, he/she is said to be diseased.
→ The word disease has evolved from dis + ease which means, not in ease.
According to the period, diseases can be classified as an acute and chronic disease.
→ Acute Disease: Diseases that's are for a short period. Example- cold, viral fever, chickenpox, malaria etc.
→ Chronic disease: Diseases that persist for a long time is called chronic disease. Example: Cancer, AIDs, Asthama, diabetes, etc.
→ Diseases can be classified as Infectious and Non-infectious one.
- Infectious diseases are caused by germs. [common cold, chickenpox, TB etc]
- Non-infectious are not caused by germs. [Diabeties, Cancer etc]
→ The further classification has, Communicable and non-communicable.
- Communicable: These can be communicated from one person to another. Ex: Diabetes.
- Non-Communicable: Can not be communicated with direct interaction. Ex, Malnutrition, hereditary diseases, Dysfunction of organs etc!
Signs and symptoms:
→ Signs: Effects of diseases that can be noticed by others. Example: Rashes.
→ Symptoms: Effects of disease that can be felt by the diseased person.
Dealing with diseases:
We'll classify pathogens into two categories,
Non-viral and viral.
We have an immune system in our body. the immune system fights with foreign harmful pathogens and helps us to stay fit. Our blood has white blood cells (WBC) which prepare antibiotics.
What is called diseases?
Different diseases have different symptoms and signs. When a person is affected by a disease, the normal functioning of the body does not happen.
What causes diseases?
There are many causes of diseases. they may include the following:
- When foreign unwanted microbes/pathogens/germs enter our body.
- Malnutrition/overnutrition.
- hereditary diseases.
- Lack of proper immunization.
- Bad environmental! conditions.
What are antibiotics?
Antibiotics are a substance which actively fights against the microbes. they fight and kills/restricts the bacteria from harming our body.
What are the antibodies?
Antibodies at produced by our immune system to fight against pathogens that try to invade our body and keeps us fit.
What are the agents that act as a carrier of pathogens?
Ans- Vector.
Give some examples of communicable diseases.
Ans- Malaria, AIDs, Chickenpox.
→ We call it a disease when the underlying cause of discomfort is known. But when it's not, we call it an illness.