Functions of lysosomes, Biology

FUNCTIONS

(1)      Intracellular digestion - Individual cells may obtain food through phagocytosis. The same is digested with the help of lysosomes. It is of two types:-

(a) Heterophagy - Digestion of foreign materials received in cell by phagocytosis and pinocytosis. Secondary lysosome performs as the intra cellular lysosomes.

(b) Autophagy - Digestion of old or worn out cell organelles. Autophagy also takes place during starvation of cell.

Ambilysosomes - Lysosomes which perform both heterophagy and autophagy.

(2)      Extracellular digestion -

Lysosomes of osteoclast (bone eating cells) dissolve unwanted part of bones. Extracellular digestion by lysosomes also occur in fungi.

(3)      Crinophagy -

Conversion of complex and inactive hormones into simple and active hormone through lysosome is called crinophagy. In endocrine gland the excessive secretory granules of hormones are digested by lysosomes. Release of thyroxine hormone from thyroglobulin stored in thyroid follicles is carried out by Lysosomal proteases.

Thyroglobulin                    →              Thyroxine

(complex  + inactive)    Lysosomes     (simple + active)

(4)      Cellular digestion (Autolysis) - Digestion of whole cell through lysosomal enzymes. Sometimes all lysosomes of a cell burst to dissolve the cell completely. Old cells are removed by autolysis, unwanted organs of embryo are destroyed by autolysis, Cathepsin of lysosome digests the tail of tadpole during metamorphosis, and untimely rupture of lysosome sometimes causes mutation.  (DNAase of Lysosome alter structure of DNA)

Posted Date: 10/5/2012 7:14:15 AM | Location : United States







Related Discussions:- Functions of lysosomes, Assignment Help, Ask Question on Functions of lysosomes, Get Answer, Expert's Help, Functions of lysosomes Discussions

Write discussion on Functions of lysosomes
Your posts are moderated
Related Questions
How does parafunctional habits lead to implant failure Parafunctional habits like bruxism and clenching create mechanical and biological problems due to overloading and is cons

Crown and bridge remover - Nash\Taylor temporary crown remover -morell remover -position the curved tip below the height of contour or at the margin of the crown -Apply seve

Explain Taxonomists as Synthesisers? Your study of the earlier units of taxonomy, in particular its history must have made you aware that the field of taxonomy has changed cons

Solar Tracking - Nastic and Epinastic Responses Many plants such as sun flowers are capable of solar tracking in which the flat blade of leaves or inflorescence will remain a

Chylomicrons, the widest of the lipoproteins, are synthesized in the intestine. They including ingested triacylglycerols to other tissues, mainly skeletal muscle and adipose tissue

Q. What are the major components of the cytoskeleton? The cytoskeleton is a network of very small filaments and tubules distributed throughout the cytoplasm of eukaryotic cells

Define the Cooper's Run (12 minute run) Method? To undertake this test, a 400 metre running track is required-marked every 100 m and a stop watch. The test comprises of noticin

Q. Briefly explain about semantides? The information carrying molecules in plants are called semantides, and they have been recognised to be 3 kinds; deoxyribonucleic acid or D

Illustrate Nernst equilibrium potential for potassium ions A complete motor neuron is removed from a frog and placed in normal physiological saline at 1 AM.  The neuron is hea

Define Clinical progress for treatment for pem? Normally, clinical improvement is evident within a week with the disappearance of oedema, The appetite improves almost dramatica