Question

What do you mean by disease? Describe the various causes of diseases.​

Answer 1

Answer:

Infectious diseases are disorders caused by organisms — such as bacteria, viruses, fungi or parasites. Many organisms live in and on our bodies. They're normally harmless or even helpful. But under certain conditions, some organisms may cause disease. Some infectious diseases can be passed from person to person.

Answer 2

Explanation:

$\large\bf\pink{\underline{\underline{What\ is\ disease:-}}}$

$\red{\odot}$ Disease is defined as a condition or a part of it in which its normal functioning gets disturbed.

$\large\bf\pink{\underline{\underline{Causes\ of\ disease:-}}}$

$\purple{\odot}$ Biological agents which are disease-causing microorganisms or pathogens like viruses, bacteria, fungi, protozoans, etc.

$\blue{\odot}$ Physical agents like heat, cold, radiation, humidity, pressure, electricity, sound, etc.

$\purple{\odot}$ Mechanical agents such as chronic friction as well as other mechanical forces that cause injuries, trauma and fractures, etc.

$\blue{\odot}$ Chemical agents which are of two types:-

• Endogenous chemical agents which are formed in the body, like urea, uric acid, etc.
• Exogenous chemical agents which enter the body of the individual from outside, like metals, spores and pollens, etc.

$\purple{\odot}$ Inherited diseases:- Some diseases are because of the hereditary reasons, disturbance in chromosomes or genes.

$\blue{\odot}$ Social agents which may cause mental disorders.

$\purple{\odot}$ Deficiency diseases are caused by insufficiency, absence or excess of a nutrient necessary for health.