Tag: excretory system of human

Sebum is an oily secretion produced by sebaceous glands, tiny ducts adjacent to hair follicles. Sebum is secreted into the follicle, from which it spreads over the hair and skin. The main role of sebum is to waterproof the skin and hair. Sweat is a salty, watery solution produced by sweat glands, numerous microscopic channels opening onto the skin surface. As sebum and sweat mix up on the skin surface, they form a protective layer often referred to as the acid mantle . Acid mantle has a particular level of acidity characterized by pH from about 4 to 5.5. A pH of 7 is considered neutral, above 7 is alkaline, and below is acidic. 

Kidney stones or renal calculi are solid masses made of crystals. Calcium stones are the most common. They can be made of calcium oxalate
So, the correct answer is 'Calcium oxalate'

Accumulation of urea in body is called uraemia. It may be due to kidney failure and other metabolic waste products may also accumulate. Uraemia develops after about 7 days of anuria (absence of urine) because of the reduced glomerular filtration rate and impaired tubular secretion of urea. Increased blood urea usually leads to confusion and mental disorientation.

Oliguria is the condition of less than 400 ml of urine per day in adults, whereas severe oliguria means less than 100 ml of urine per day in adults. Anuria means absence of urine and diuresis is the production of a large volume of urine. Diuresis may lead to acute dehydration and electrolyte imbalance.

Phenylketonuria results when there is a deficiency of liver enzyme phenyl alanine hydroxylase that converts phenyl alanine into tyrosine. It results with a high level of phenyl alanine in blood, tissue fluids and urine.

Normal stools can vary in shades of brown, mostly due to diet.
Bile salts are released into the stools by the liver, giving the stools a brown color. If the liver is not producing enough bile, or if the flow of the bile is blocked and not draining from the liver, the stools will be pale or clay-colored.
Therefore, the correct answer is option D.

• Dialysis is an artificial procedure of excretion of metabolites from the blood when kidneys do not work. 
• In this process, the harmful waste products are removed from the blood. The dialysis apparatus of the dialyzer is commonly known as an artificial kidney.
• The process of dialysis is generally recommended for the person who has been suffering problems related to the kidney and the kidney is not functioning properly.

Diuresis as a pathological condition occurs  under hyposecretion of ADH or Vasopressin, which affects the water rreabsorption by the tubule into the blood by the peritubular network.This results in excretion of dilute urine. A disorder known as diabetes insipidus.

Diabetes insipidus (DI) is an uncommon condition in which the kidneys are unable to prevent the excretion of water. The amount of water excreted in the urine is controlled by antidiuretic hormone (ADH). ADH is also called vasopressin. ADH is produced in a part of the brain called the hypothalamus. It is then stored and released from the pituitary gland. This is a small gland just below the base of the brain. DI caused by a lack of ADH is called central diabetes insipidus. When DI is caused by a failure of the kidneys to respond to ADH, the condition is called nephrogenic diabetes insipidus.  Nephrogenic means related to the kidney.