الإصابة بالفيروسات - الأحياء - الصف الثالث الثانوي - الفصل الأول

الإصابة بالفيروسات - الأحياء - الصف الثالث الثانوي - الفصل الأول

Learn how the mucous membrane lining the respiratory system helps to prevent infection.

Learn that immunisations and medicines can be used to help the body fight infections.

Painting of Ectopic Embryo:all pregnancies develop outside the uterus, called an ectopic pregnancy. These are nearly always in the fallopian tube. Rarely, an ectopic pregnancy will be located in an ovary or in the cervix, or even in the abdomen. Ectopic pregnancy is more common in women with the...

Painting of Adenoviruses:Adenoviruses are medium-sized (90–100 nm), nonenveloped (naked) icosahedral viruses composed of a nucleocapsid and a double-stranded linear DNA genome. There are 53 described serotypes in humans, which are responsible for 5–10% of upper respiratory infections in...

Painting of Tobacco Mosaic Virus:Tobacco mosaic virus (TMV) is an RNA virus that infects plants, especially tobacco and other members of the family Solanaceae. The infection causes characteristic patterns (mottling and discoloration) on the leaves (hence the name). TMV was the first virus to be...

Painting of Streptococci and Diplococcus:When cocci were first being observed their organisation was just about all microbiologists had to go on to identify them. Thus, basic divisions between diplococci, streptococci and staphylococci were made and these names used for the different genera. We...

Painting of Chicken Pox:Chickenpox or chicken pox, also known as varicella, is a highly contagious illness caused by primary infection with varicella zoster virus (VZV). It generally starts with a vesicular skin rash appearing in two or three waves, mainly on the body and head rather than the...

Painting of Monocytes:Monocyte is a type of white blood cell, part of the human body's immune system. Monocytes have two main functions in the immune system: (1) replenish resident macrophages and dendritic cells under normal states, and (2) in response to inflammation signals, monocytes can...

Painting of Eosinophills:Eosinophil granulocytes, usually called eosinophils (or, less commonly, acidophils), are white blood cells that are one of the immune system components responsible for combating infection and parasites in vertebrates. Along with mast cells, they also control mechanisms...

Painting of Tobacco mosaic virus:Tobacco mosaic virus (TMV) is an RNA virus that infects plants, especially tobacco and other members of the family Solanaceae. The infection causes characteristic patterns (mottling and discoloration) on the leaves (hence the name). TMV was the first virus to be...

Painting of HIV Virus:Human immunodeficiency virus (HIV) is a lentivirus (a member of the retrovirus family) that causes acquired immunodeficiency syndrome (AIDS), a condition in humans in which the immune system begins to fail, leading to life-threatening opportunistic infections. Infection with...

Painting of Ascaris as Endoparasite in human intestine:Ascaris is a genus of parasitic nematode worms known as the giant intestinal roundworms. One species, A. suum, typically infects pigs, while another, A. lumbricoides, affects human populations, typically in sub-tropical and tropical areas...

Painting of Tooth decay:Dental caries, also known as tooth decay or cavity, is a disease wherein bacterial processes damage hard tooth structure (enamel, dentin and cementum).These tissues progressively break down, producing dental cavities (holes in the teeth). Two groups of bacteria are...

Painting of Tooth decay:Dental caries, also known as tooth decay or cavity, is a disease wherein bacterial processes damage hard tooth structure (enamel, dentin and cementum).These tissues progressively break down, producing dental cavities (holes in the teeth). Two groups of bacteria are...

Painting of Symptoms of german measles:Rubella — commonly known as German measles or 3-day measles — is an infection that primarily affects the skin and lymph nodes. It is caused by the rubella virus (not the same virus that causes measles), which is usually transmitted by droplets from the...

Painting of Fungi affects potatoes:Fusarium dry rot of potatoes,Dry rot is an appropriate description of this very common disease. Sunken and often shriveled areas on the surface of infected tubers are the most obvious symptom. When tubers are cut through the affected areas, tissues appear...

Painting of Gonorrhea bacteria:Gonorrhea (also gonorrhoea or 'the clap') is a common sexually transmitted infection caused by the bacterium Neisseria gonorrhoeae (also called Gonococcus, which is often abbreviated as "GC" by clinicians). In the US, its incidence is second only...

Painting of Image of Spleen:The spleen is an organ found in all vertebrate animals with important roles in regard to red blood cells and the immune system .In humans, it is located in the left upper quadrant of the abdomen. It removes old red blood cells, holds a reserve in case of hemorrhagic...

Painting of Red currant..The Red currant (Ribes rubrum) is a member of the genus Ribes in the gooseberry family Grossulariaceae, native to parts of western Europe (Belgium, France, Germany, Netherlands, Northern Italy and Northern Spain). It is a deciduous shrub normally growing to 1-1.5 m tall,...

Painting of Roundworm:Roundworms are a group of invertebrates with long, round bodies. They range in size from those plainly visible to the naked eye to those visible only under a microscope. Roundworms are also called nematodes.Humans contract most types of roundworm infection from contaminated...

Vector Generated Image of :Cestoda is a class of parasitic flatworms, commonly called tapeworms, that live in the digestive tract of vertebrates as adults and often in the bodies of various animals as juveniles. Taenia saginata, the beef tapeworm, can grow up to 40 feet long (12 m); other species...

Vector Generated Image of Ascaris is a genus of parasitic nematode worms known as the giant intestinal roundworms. One species, A. suum, typically infects pigs, while another, A. lumbricoides, affects human populations, typically in sub-tropical and tropical areas with poor sanitation. A....

Vector Generated Image of Ascaris is a genus of parasitic nematode worms known as the giant intestinal roundworms. One species, A. suum, typically infects pigs, while another, A. lumbricoides, affects human populations, typically in sub-tropical and tropical areas with poor sanitation. A....