Why is person suffereing from high blood pressure is advised to take minimum quantity of common salt?

A person suffering from deficiency of visual pigment rhodopsin is advised to take more of:

Sangeeta's gardner was suffereing from high blood pressure but he was not caring for his health. One day Sangeeta took him to the doctor. The doctor advised him to take less quantity of salt in his diet. Sangeeta suggested gardner's wife to cook food for her husband with very little salt. Answer the following questions: Why did the doctor advise Sangeeta's gardner to take less quantity of salt?

Sleeping pills are recommended by doctors to the patients suffering from sleeplessness but it is not advisable to take its doses without consultation with the doctor. Why ?

Sleeping pills are recommended to patient suffering from sleepness but it is not advisable to take them without consulting the doctor. Why?

Why does a person suffering fom scurvy complaint of gum bleeeding?

Explain why The blood pressure in humans is greater at the feet than at the brain?