Cholesterol is harmful as it causes blood pressure and heart attack, even then it is considered essential for human body. Why ?

Cholesterol are considered essential for our body as

1. Cholesterol is  the precursor of many hormones such as progesterone, testosterone, estradiol and Cortisol.
2. Cholesterol provides fluidity to the cell membrane  and hence helps in the maintenace of its structure.
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What are glycolipids ?

Glycolipids are membrane components composed of lipids that are covalently bonded to monosaccharides or polysaccharides. They contain lipid and carbohydrate. They are components of the membranes. 
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Give three examples of phospholipids.

The examples of phospholipids are :

i. Lecithin.

ii. Cephalins. 

iii.Sphingomyelin.

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What are phospholipids ? What is their importance in living cells ?

Phospholipids are lipds containing phosphorous and a phosphorylated compound. They are found in the cell membranes. For example - Lecithin.

 

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What do you mean by ‘vegetable oil rich in polyunsaturates’ ? Why is it recommended by physicians for persons suffering from high blood cholesterol or cardio vascular diseases ?


Polyunsaturated fatty acids are those which have more than one double bond. The vegetable oil having such polyunsaturate fatty acids is said to be rich in polyunsaturates.
Physicians recommend these to person's suffering from high blood pressure or cardio vascular diseases, because these lower the blood pressure and thus decreases the risks.  

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