IMMUNOLOGY

OVERVIEW OF THE IMMUNE SYSTEM

IMMUNITY INNATE AND ADAPTIVE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A cellular structure used in phagocytosis filled with digestive enzymes such as protease.
A
vesicle
B
Phagosome
C
Phagolysosome
D
Lysosome
Explanation: 

Detailed explanation-1: -Lysosomes are membrane-bound vesicles that contain digestive enzymes, such as glycosidases, proteases and sulfatases. Lysosomal enzymes are synthesized in the endoplasmic reticulum (ER), are transported to the Golgi apparatus, and are tagged for lysosomes by the addition of mannose-6-phosphate label.

Detailed explanation-2: -Lysosomes are membrane-enclosed compartments filled with hydrolytic enzymes that are used for the controlled intracellular digestion of macromolecules. They contain about 40 types of hydrolytic enzymes, including proteases, nucleases, glycosidases, lipases, phospholipases, phosphatases, and sulfatases.

Detailed explanation-3: -Lysosomes are acidic and hydrolytic organelles responsible for receiving and digesting cargo acquired during endocytosis, phagocytosis, and autophagy. For macrophages and dendritic cells, the lysosome is kingpin, playing a direct role in microbe killing and antigen processing for presentation.

Detailed explanation-4: -Autophagy (a Greek word that means “self-eating") is a catabolic process in eukaryotic cells that delivers cytoplasmic components and organelles to the lysosomes for digestion. Lysosomes are specialized organelles that break up macromolecules, allowing the cell to reuse the materials.

Detailed explanation-5: -A phagosome is known as a food that is engulfed inside the cell with the help of phagocytosis. Phagosome combines with the primary lysosome which contains inactive enzymes to form the secondary lysosome which has active enzymes to break down the food.

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