IMMUNOLOGY

OVERVIEW OF THE IMMUNE SYSTEM

A HISTORICAL PERSPECTIVE OF IMMUNOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which one of the following kills invading microbes?
A
lysozymes
B
stomac acid
C
macrophages
D
all of the above
Explanation: 

Detailed explanation-1: -Phagocytic cells ingest and destroy all microbes that pass into body tissues. For example macrophages are cells derived from monocytes (a type of white blood cell). Macrophages leave the bloodstream and enter body tissues to patrol for pathogens.

Detailed explanation-2: -Phagocytes are a type of white blood cell that move by amoeboid action. They send out pseudopodia which allows them to surround invading microbes and engulf them. Phagocytes release digestive enzymes which break down the trapped microbes before they can do any harm. This process is called phagocytosis.

Detailed explanation-3: -Immune Response Antibodies attach to and immobilize microorganisms. They kill them outright or help neutrophils target and kill them.

Detailed explanation-4: -These disease-fighting cells are made in the bone marrow and are stored in many different places in the body such as the tonsils and adenoids. There are two types of leukocytes: phagocytes and lymphocytes. Phagocytes engulf the intruders, break them down and chew them up.

Detailed explanation-5: -White blood cells: Serving as an army against harmful bacteria and viruses, white blood cells search for, attack and destroy germs to keep you healthy. White blood cells are a key part of your immune system.

Detailed explanation-6: -The first line of immune defense against invading pathogens like bacteria are macrophages, immune cells that engulf every foreign object that crosses their way. After enclosing it in intracellular membrane vesicles, a process called phagocytosis, macrophages kill their prey with acid.

Detailed explanation-7: -Like cytotoxic T cells, NK cells destroy virus-infected cells by inducing the infected cell to kill itself by undergoing apoptosis. Unlike T cells, however, NK cells do not express antigen-specific receptors.

There is 1 question to complete.