AP BIOLOGY

ANIMAL PHYSIOLOGY

EXCRETION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The liver plays a role in excretion because it converts ammonia, a toxic nitrogen-containing waste, to ____, which is a much less toxic waste
A
urea
B
nephrons
Explanation: 

Detailed explanation-1: -With the help of specific catalysts in the liver cells carbon dioxide reacts chemically with the ammonia molecule, NH3. The less toxic nitrogenous compound urea is produced together with water. This series of reactions is called the ornithine cycle.

Detailed explanation-2: -It helps in the excretion of vitamins, drugs, steroid hormones, and waste material through bile. The liver converts the amino acids present in the blood into ammonia and pyruvic acid. Pyruvic acid gets oxidized to release energy, and ammonia gets converted into urea.

Detailed explanation-3: -The liver manufactures blood serum proteins, including albumin and several clotting factors, and supplies them to the blood. The liver also metabolizes nitrogenous waste products and detoxifies poisonous substances, preparing them for elimination in the urine or feces.

Detailed explanation-4: -Ammonia is highly toxic and has a high solubility in water. Urea is less soluble and less toxic than ammonia. Uric acid is least toxic and has low solubility. Excretion of nitrogenous waste from a frog and a tadpole would primarily be as.

Detailed explanation-5: -Liver converts the ammonia to a non-toxic compound, urea, which is then safely transported by the blood to the kidneys. Kidneys eliminate the urea through urine.

There is 1 question to complete.