Tag: Physiology SAQ

Short notes on Mitochondria

Short notes on Mitochondria

Definition : The mitochondria are the powerhouse of the cell. ii. Total number per cell : Varies from less than one hundred up to several thousand. iii. Size and shape : It is variable in size and shape. Some are only a few hundred nanometers in diameter and globular in shape, where as others are […]

April 30, 2012 | By | Reply More
The functions of the mitochondria

The functions of the mitochondria

Functions are 1. The enzymes of the mitochondria cause oxidation of the nutrients (carbohydrate, protein, and fat), thereby forming carbon dioxide & water and liberate energy. The liberated energy is used to synthesize a high energy substance called a triphosphate (ATP). ATP is then transported out of the mitochondrion and it diffuses throughout the cell […]

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The physiological importance of endoplasmic reticulum

The physiological importance of endoplasmic reticulum

 Functions of endoplasmic reticulum are 1.Granular endoplasmic reticulum Synthesis of protein in the cell. 2 Agranular endoplasmic reticulum Synthesis of lipid substances and in many other enzymatic processes of the cell. 3, Other significant function of the endoplasmic reticulum especially the smooth reticulum, include the following a.It provides the enzymes that control glycogen breakdown when […]

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The function of nucleus

The function of nucleus

The functions of nucleus are : 1. It is the dynamic centre of life as it controls nutritive and respiratory activities of the cells. 2. It influences growth and initiates divisions or reproduction of cell. 3. The DNA molecules of nucleus act as regulator of synthesis of enzyme protein or proteins in the cytoplasm. 4. […]

April 28, 2012 | By | Reply More
Functions of the cell membrane

Functions of the cell membrane

a. Functions of the lipid of the cell membrane: i. The lipid layer in the middle of the membrane is impermeable to the usual water-soluble substances such as ions, glucose. and urea. sat-soluble substances, such as oxygen, carbon dioxide, alcohol, can penetrate this portion of the membrane with ease, ii. The cholesterol in the cell […]

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Chemical compound that make up the cell membrane

Chemical compound that make up the cell membrane

It is composed almost entirely of proteins and lipids. The approximate composition is 1.         Protein 55% 2.         Lipid   42% a.         Phospholipids  25% b.         Cholesterol      13% c.         Others lipids    4% 3.         carbohydrates : 3%. Q.  Name the chemical compound that make up the cell membrane.

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