Biology questions stuck please help 'homeostasis'?

Question

they need to be sciency answers

1) the hepatic artery and the hepatic portal vein both bring blood to the liver. Describe and explain the differences in composition of blood in these vessels.?

2)describe how the following are metabolised in the liver cells;

(i) amino acids

(ii) fats and other lipids

3) a diuretic is a substance which increases the production of urine.

(i) some substances stop ADH from being secreted. Explain how these substances act as diuretics?

(II) describe how you could investigate whether drinking tea has a diuretic effect?

Please try and help me, whether u can give the whole answer or parts of answers to any of the questions it would be helpful.

For the record i am not lazy, i have tried hard to answer these questions but am really finding it difficult to.

Thanks to all that help and i will choose the best answer from the person who can help me out the most.

Thanks

Answer 1

1. The hepatic artery transports nutrients (eg glucose) and oxygen to the liver cells. The glucose and oxygen are required for respiration of the liver cells.

The hepatic portal vein transports nutrients absorbed from the villi in the small intestine  (glucose , amino acids , vitamins, etc.) to the liver .

2.  (i)Amino acid are used for protein synthesis. The excess amino acids are broken down (deaminized) into ureum and glucose.

3. (i) Alcohol inhibit ADH secretion. Less water is thus reabsorbed in the nephron and more water remains in the urine. The urine will thus be more, darker in colour and more concentrated.

(ii)  Hypothesis: Tea acts as a diuretic.

Drink three cups of tea. Note the time of day, environmental temperature and body temperature. Do not exercise. Sit and wait for urination urge. Keep your urine for as long as possible. Measure the volume urine passed.

Next day,  same time and temperatures the same. Drink three cups of water.Follow same further instructions. Then compare your urine volumes passed.Make conclusion and state if your hypothesis was correct or wrong.