Human Excretion and Kidney Physiology

Bile is a digestive fluid produced by the liver and stored in the gallbladder. It helps break down fats in the small intestine during digestion. The liver continuously produces bile, which is then concentrated and stored in the gallbladder.

Hepatitis is inflammation of the liver, usually caused by viral infections (Hepatitis A, B, C, etc.) or other factors like alcohol or toxins. The liver is the primary organ affected by hepatitis. Kidneys filter blood (affected by nephritis), heart is affected by cardiac conditions, and eyes are not related to hepatitis.

Epithelial tissues in the kidney excrete waste products from the body and reabsorb needed materials from the urine. Sweat is also excreted from the body by epithelial cells in the sweat glands.

The liver is the primary organ responsible for metabolizing alcohol. Excessive alcohol consumption causes fatty liver, alcoholic hepatitis, and eventually cirrhosis - permanent scarring of liver tissue. The liver breaks down alcohol, but this process produces toxic byproducts that damage liver cells over time.

Lutenising hormone helps in promoting spermatogenesis and ovulation.

Calcitroic acid (1α-hydroxy-23-carboxy-24,25,26,27-tetranorvitamin D3) is a metabolite of 1α,25-dihydroxyvitamin D3 (calcitriol). Its formation is catalyzed by the enzyme calcitriol 24-hydroxylase. Calcitroic acid is soluble in water and excreted in urine.

The nephron is the microscopic functional unit of the kidney that filters blood and produces urine. Each kidney contains about 1 million nephrons, which consist of glomeruli and renal tubules. Electrons are subatomic particles, sclera is eye white tissue, and capillaries are small blood vessels but not kidney functional units.

Urine is not used in the production of detergents.

 A  high meat content can decrease urine pH (more acidic). A diet high in citrus, vegetables, or dairy can increase urine pH (more basic).

Hydronephrosis is the enlargement of one or both of the kidneys caused by obstruction of the flow of urine.

Intercalated cells come in α and β varieties and participate in acid-base homeostasis.

It is the metanephros, which goes on to become the adult kidney.

Prostaglandins are powerful vasodilators and there is a normal tonic level of vasodilation in the renal blood vessels, which is caused by the prostaglandins.

The basic problem is usually loss of water, treatment is usually with careful replacement of this loss. As with hyponatremia, it is important not to replace the loss too quickly. This is because the cells make compensatory changes during hyperosmolar conditions and a sudden change can be dangerous as the cells do not have time to readjust back to normal. The best way to prevent this is to keep checking the plasma sodium to ensure that it is not changing too quickly.

Dialysis is a medical treatment that artificially removes waste products and excess fluid from the blood when the kidneys are not functioning properly. The kidneys normally filter blood, but when they fail due to chronic kidney disease or acute kidney injury, dialysis machines perform this essential function. Options A (stomach), B (liver), and C (brain) are incorrect because dialysis is not used to treat disorders of these organs.