Education
- What Is Insulin?
Insulin is a hormone. It works as a chemical messenger that helps your body use the glucose in your blood to give you energy. You can think of it as the key that unlocks the door to the body’s cells. Once the door is unlocked, glucose can enter the...
- Iom Past Question With Answers For Mbbs Entrance Exam
See the most important entrance questions for mbbs ( medical) students :- 1. Immature proglotids of Taenia solium have: c) Vitelline follicles and shellgland but not glands d) Uterus but neither ovaries nor testes 2. Which one of the following insects...
- Frog Dissection
Background: As members of the class Amphibia, frogs may live some of their adult lives on land, but they must return to water to reproduce. Eggs are laid and fertilized in water. On the outside of the frog’s head are two external nares, or nostrils;...
- Cell And It's Type
Concept 1: Common Features of All CellsAll cells, whether they are prokaryotic or eukaryotic, have some common features. The common features of prokaryotic and eukaryotic cells are:1. DNA, the genetic material contained in one or more chromosomes and...
- Discovery Of Sickle Cell Anemia
An American doctor, R. Lebby, wrote the first modern description of sickle cell anemia in 1846 in an article titled ‘Case of Absence of the Spleen.’ The next published reports of sickle cell disease were in African medical articles. These articles...
Education
Mitochondria In Details
Fig: Ultrastructure of Mitochondria
Mitochondria was first discovered by Koliker.According to him Mitochondria is made up of mitos & chondrian. Here mitos means thread & chondrian means organell. Hence we can say that mitochondria is a thread like structure (organelle) present inside the cell.
Occurance
Mitochondria is the most prominent cellular structure . It is found in all eukyarotic cells except mature mammalian R.B.C and sieve tube but it can not be found in prokyarotic cells.
Shape & Size
It varies cell to cell.The shape might be oval shape ,sphere shape or like that .The biggest sized mitochondria is found in Toad(xenopus) & the smallest one is found in yeast .
Position
It depends upon the functional state of organ.Metabolically active part contains large & high no.of mitochondria and inert part contains comparatively small and little no. of mitochondria.
Ultra structure
Mitochondria is double membrane bounded ,most prominent cellular structure.The inner membrane surrounds internal materials which is embedded in the Matrix .The inner membrane of mitochondria is protruded into numerous infolds which is called cristae. The space between cristae is called inter cristae cavity and the space between inner membrane & outer membrane is called inner chamber . Inside the innermembrane we can found matrix in which 70s[1]type of ribosome,mitochondrial D.N.A[2],some lipids,R.N.A [3]& some other cell inclusions are found.Due to these raw materials mitochondria can form some of required proteins but for enough protein,it must depend upon other nuclear D.N.A and like that materials . This type of behavior shown by mitochondria is known as semi-autonomous nature of Mitochondria.
Functions of Mitochondria
® It is a power house of cell so it helps in the activities of energy & power.
® It produces & stores the energy in the form of A.T.P[4]
® It helps in the formation of some required protein
® It helps in the yolk formation during the development of ovum
® It forms the middle piece of sperm during sperm maturation
® It takes a part in the cellular respiration
® It helps in the metabolic activities
® It is a site of protein synthesis
® It distribute the stored energy to energy required organelle of area
® It makes the cell more active and helps in active performance ……e.t.c. J J
Writer
Subash Bhattarai
(Svedberge unit)
[2]Dioxyribo-nucleic Acid
[3]Ribo-nucleic Acid
[4]Adenosene Triphosphate
- What Is Insulin?
Insulin is a hormone. It works as a chemical messenger that helps your body use the glucose in your blood to give you energy. You can think of it as the key that unlocks the door to the body’s cells. Once the door is unlocked, glucose can enter the...
- Iom Past Question With Answers For Mbbs Entrance Exam
See the most important entrance questions for mbbs ( medical) students :- 1. Immature proglotids of Taenia solium have: c) Vitelline follicles and shellgland but not glands d) Uterus but neither ovaries nor testes 2. Which one of the following insects...
- Frog Dissection
Background: As members of the class Amphibia, frogs may live some of their adult lives on land, but they must return to water to reproduce. Eggs are laid and fertilized in water. On the outside of the frog’s head are two external nares, or nostrils;...
- Cell And It's Type
Concept 1: Common Features of All CellsAll cells, whether they are prokaryotic or eukaryotic, have some common features. The common features of prokaryotic and eukaryotic cells are:1. DNA, the genetic material contained in one or more chromosomes and...
- Discovery Of Sickle Cell Anemia
An American doctor, R. Lebby, wrote the first modern description of sickle cell anemia in 1846 in an article titled ‘Case of Absence of the Spleen.’ The next published reports of sickle cell disease were in African medical articles. These articles...