Mitochondria, Biology

Assignment Help:

MITOCHONDRIA (Singular-  MITOCHONDRION)

These are conspicuous, hollow  sac liked  cell organelles found in all eukaryotic  cells except  mature  red  blood  corpuscles RBCs of mammals  unlike most other  organelles. The mitochondria  are large  enough  to be  resolved with light  microscopes. That is why these were first  observed  and called  sarcosomes  as  early as 1857 by Kolliker .Later these  were  renamed  as  bioblasts  by altmann  1894  and as mitochondria  by benda 1897.

Mitochondria widely very  in their  number  shapes and sizes  in different  types  of cells  certain  inicellular organisms  contain a single  large mitochondrion,  but generally  their number varies from 50 to  several  thousand depending upon  the physiology or function of the concerned cells higher  the rate   of  metabolism  in a cell more  is the number of mitochondria in it .The shape of mitochondria  is variable  but generally  these are  thread like ellipsoidal  spherical  or ovoid . These  are approximately  of the size  of bacteria varying from 0.2 to 1.00  in girth  and from  0.5  to 7.00 in length. These  are  however  dynamic organelles  in that these  can change  their  shapes  and size  can passively  move about  with  streaming  of the  cytosol  and may multiply  by division.

Structurally  a mitochondrion consists of a fluid filled  cavity surrounded. not  by  a single  but by two  rilaminar  unit  membrane  an outer limiting  membrane  and somewhat thicker inner  membrane  .The outer membrane  is smooth and straight. The  inner membrane  is infolded  into the cavity, forming  a number of simple  or branched plate like  sepa  or tubular    ridges , both  called  cristae . Being  incomplete  the cristae do not break the continuity  of mitochondrial cavity. The  part  of the inner membrane  covering  the cristae  bears  numerous  regularly spaced minute  club shaped  particles  projecting into the  mitochondrial  cavity . These  particles are called  elementary  or  F0 F1 particles .Each  particle has  three distinct part a base piece embedded in the  membrane , a projecting  stalk  or pedicel and   a knob like head at the tip of the stalk .The two mitochondrial membrane are separated by a narrow  fluid  intermembrane  or peri mitochondrial   space  which  continues as  a thin  core into  the cristae, The  cristae.  The fluid of mitochondrial cavity called mitochondrial  matrix, is a dense and finely granular  jelly like proteinaceous material.


Related Discussions:- Mitochondria

Explain beef extract and yeast extract, Explain Beef Extract and Yeast Extr...

Explain Beef Extract and Yeast Extract These are aqueous extracts of lean beef and brewer's yeast, respectively. Beef extract provides amino acids, peptides, nucleotides, organ

Can you explain hormones, Q. What are hormones? Hormones are substances...

Q. What are hormones? Hormones are substances collected by the circulation and secreted by the endocrine glands that act to produce effects upon specific tissues and organs and

Taxonomy.., what is the androcium in china rose ..

what is the androcium in china rose ..

Which are plant tissues that form the plant roots, Which are plant tissues ...

Which are plant tissues that form the plant roots? Roots have a central portion called medulla made of vascular tissue outer phloem and inner xylem. Medulla is delimited by per

Can you explain ventricular septal defect, Q. Can you explain Ventricular S...

Q. Can you explain Ventricular Septal Defect? VSD can be found in various part of ventricular septum hence all possible views except suprasternal views are used to detect an

Define requirements of chromium, Define Requirements of Chromium? There...

Define Requirements of Chromium? There is no Recommended Dietary Allowance (RDA) for chromium but adequate intakes that can be used as a goal for individual intakes has been pr

Is rabies caused by virus or by bacteria?, Q. Is rabies caused by virus or ...

Q. Is rabies caused by virus or by bacteria? How is it transmitted? Which organs and tissues are affected by the disease? How is it prevented and treated? The Rabies, as well k

Need help, Many endangered plant species are currently being propagated by ...

Many endangered plant species are currently being propagated by commercial growers and botanical gardens and the sold (as both plants and seeds) to government agencies. Conservatio

Loss-of-function mutations, Choose the correct answer. A. The phenotype det...

Choose the correct answer. A. The phenotype determines the genotype. B. True-breeding individuals are produced by repeated backcrossing. C. Recessive alleles are usually loss-of-fu

How does temperature affect the action of enzymes, How does temperature aff...

How does temperature affect the action of enzymes upon their substrates? There are explained temperature ranges under which enzymes operate and there is a specific temperature

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd