Phagocytosis & Exocytosis PDF
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This document explains the processes of phagocytosis and exocytosis in cells. It describes how cells engulf materials and remove substances. The article also provides further details relating to how materials are transported across, and secreted.
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_ PhagocYtosis' It literaily means method "cell eating". It is a common of feeding among the Protozoa and lower metazoa (c'9" sponges). It is also the waY in which white blood ceils (leucocytes) engulf cellular debris and uninvited microbe, (viruses and bacteria) in the blood. Like WBCs' there such...
_ PhagocYtosis' It literaily means method "cell eating". It is a common of feeding among the Protozoa and lower metazoa (c'9" sponges). It is also the waY in which white blood ceils (leucocytes) engulf cellular debris and uninvited microbe, (viruses and bacteria) in the blood. Like WBCs' there such as the are other lAmt-tebn) PhagocYtes, macroPhages founcl in connective and liver sinusoids' In the tissue 1- :- :' '"1-i =-:i t Z' --J " inieetious agent '.--. I \ I I 6 -: tt- Iysosorne the Phagocytosis' ln pseudopodia.l ,movement' join with the Lvsosomes particle thu (a type of white bl""d ;;lii "ngulft contents (the digestive phagocyte punitf"' and pour their vacrole containing "iryrutl Gti - 'nE"*jto clestroy the particle' lnto the-vacuole,.-.: :-e -: i :=, _--a -=- 1. It is the intake of extra-cellular macromolecules. membrane inrraginates 2. Plasma 3. 4. S. materials' It is a nutritive Process/ Endocvtotic vesicles are onh'0'1 pmwide' l-. Itistheintake of extracellular particles. 2. Plasma membrane grows around the particle as pseudoPoclia. 3. trt is a nutritive and a defensive process' wide' 4. Phagocvtotic vesicies are 1 to 2 pm or more ExoeYtosla and formation of a vesicle, the membrane be brought into a cell bY invagination can materials medium' iust and extrude its contents to the surrounding membrane plasma the with fuse can of a vesicle in various ce1ls to 1' remove or exocYtosis. ExocYtosis occurs vomiting cell called is process This substances such as hormones' brought in by endocYtosis, 2' secrete undigested residues of substances plasma enzYmes, and 3. cytosol membrane transport a substance as compietel,v across a celiular barrier' For eranrPle, ar sr-rsl.:t.lt''cc,i I 1c\ ': -.r: il'- ll'.ll' ' :' ::.,-' a_.' :r cell secretion released : - rrl ll-a -, -' vessel br ':,- ,. - moved acl os a : -- ' cell, ancl releasei I C B Figure 25. ExocYtosis bY a cell' : exocYtosis. The Fundomentol Unit 26 \ of Life: Cell
