Advertisements
Advertisements
Question
Explain in your own words with suitable examples.
How does excretion occur in human beings?
Advertisements
Solution
- The excretory system removes wastes from the body, which is an important function.
- The human excretory system is made up of two kidneys, two ureters, the urine bladder, and the urethra. The kidneys produce urine by removing waste and undesirable chemicals from the bloodstream.
- Nephrons are the functional units of the kidney that perform the basic function of filtration. The urea generated in the liver enters the bloodstream.
- When urea-containing blood enters the glomerulus, it is filtered by capillaries, removing urea and other related compounds.
- Water molecules and tiny molecules of other substances can pass through the semipermeable membrane of Bowman's capsule.
- The fluid that has accumulated in the Bowman's capsule cavity enters the nephron's tubular portion. Here, water molecules and other important compounds are reabsorbed into the bloodstream.
- Urine is generated from the residual fluid, which contains waste elements. The ureters carry urine, which is then stored in the urinary bladder. Urine is then released through the urethra.
APPEARS IN
RELATED QUESTIONS
Name the Following
The organ which produces urea.
_____________ secreted by the (ii) _____________ lobe of the pituitary gland. If this hormone secretion is reduced, there is an increased production of urine. This disorder is called (iii) ____________. Sometimes excess glucose is passed with urine due to hyposecretion of another hormone called (iv) _____________ leading to the cause of a disease called (v) ______________.
What gaseous waste products are excreted by plants?
Name the various organs of the human excretory system.
In which of the following are the largest amounts of nitrogen excreted from a mammalian body?
(a) breath
(b) sweat
(c) urine
(d) faeces
Given below is a set of five terms. Rewrite the terms in their correct order so as to be in logical sequence.
Renal artery, urethra, ureter, kidney, urinary bladder.
One of the following sets of body parts or substances or processed, pick out the one item which overall includes the remaining foir.
Skin, liver, lungs, kidneys, excretion.
Differentiate between the following pairs of terms:
Bowman’s capsule and malpighian capsule.
Choose the correct answer:
Composition of extracellular fluid is regulated by ___________
Given below is a diagram of a human kidney, cut open longitudinally. Answer the following:
(i) Give definition of excretion.
(ii) Name the unit of kidney.
(iii) Why does the cortex of kidney show dotted appearance?
(iv) List the functions of the kidney.
Given below is a highly simplified diagram of the human kidney cut open longitudinally. Answer the question that follow:
Mention two functions of the kidney.
Differentiate between:
Renal cortex and Renal medulla.
Name the Following
The division of the kidney which is light in colour and subdivided into conical renal pyramids.
Name the Following
The blood vessels which brings pure blood to the kidneys:
Complete the following sentence with appropriate words:
The outer surface of the kidney is ______ while the inner surface is ______.
Write the functional activity of the following structure: Vasopressin
Write the functional activity of the following structure: Henle’s loop
Osmoregulation maintains the osmolarity of blood at about ______.
Among the following animals, the best conserver of water is ______.
What is the purpose of making urine in the human body?
