Mitochondria

Mitochondria appear in the eukaryotic cells and referred to as cellular energy centre. 

The major sites  of aerobics respiration within cells. The number of mitochondria in the cell varies significantly from cell to cell. Also, the number of mitochondria in a cell depends on the nature of the cell and the type of the organism.

In cells with high energy requirement, the mitochondria are abundant. There is a higher number of mitochondria in liver cells because of the high energy requirement.

In low-energy cells, the number of mitochondria decreases.

Also, the shape and size of the mitochondria are different.

Generally, the active cells are larger than  less active cells.

Mitochondria has the ability to change its shape. Some mitochondria can move to active areas of cells to supply energy. The movement of mitochondria is prevalent in the large concentration of mitochondria in areas where ATP greater.

Structure of mitochondria

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Cytoplasm

The living contents of Eukaryotic cells are divided into nucleus and cytoplasm. The cytoplasm and nuclei together forms into the Protoplasm.

Cytoplasm is an aqueous substance. It contains variety of cell organelles such as mitochondria, ribosomes, endoplasmic reticulum, chloroplast etc. And also contain insoluble waste storage products etc.

The soluble part of the cytoplasm forms the ground substance between cell organelles. It contains a skeleton of fibrous but otherwise appear and structureless in the electron microscope.

It consists of 90% water and forms solution. Solution contains all the fundamental biochemical of life.

Some of these are ions, small molecules and large molecules.

Sodium, Potassium are some examples for ions in cytoplasm.

Salts, sugars, amino acids, fatty acids, nucleotides, vitamins and dissolved gases are examples for small molecules in cytoplasm.

Also proteins are large molecules finding inside the cytoplasm which form colloidal solution.

According to this explanation ground substance is acting as a store of vital chemicals.

Also, it is the site of certain metabolic Pathways.

                 Ex:- glycolysis

Some organelles move inside the cytoplasm such as mitochondria move about.

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