Advertisements
Advertisements
प्रश्न
Describe the mechanism of urine formation in human excretory system. Draw a labelled diagram to illustrate your answer.
Advertisements
उत्तर
Kidneys are the main excretory organ of the human body. There are about millions of nephron in each kidney. Each nephron contains a renal corpuscle and a renal tubule. The renal corpuscle consists of capillaries called the glomerulus, enclosed by a capsule called Bowman's capsule. The blood containing wastes (like urea) enters the glomerulus. The glomerulus filters the blood. During filtration, the filtrate (containing substances like glucose, amino acids, salts, water and urea) present in the blood travels through the renal tubule where materials needed by the body are reabsorbed, while the wastes like urea are collected and excreted in the urine. The nephron carries the urine into the collecting tubule of the kidney from where it is carried to the ureter. From the ureter, the urine passes into the urinary bladder. The urinary bladder stores the urine until it is forced out of the body, through an opening known as the urethra.
APPEARS IN
संबंधित प्रश्न
the biological/technical terms for the hormone increasing reabsorption of water by kidney tubules
What is the name of the tubes which connect the kidneys to bladder?
Why do some people need to use a dialysis machine? What does the machine do?
The excretory unit in the human excretory system is called:
Fill in the blank.
....................... are present in the stem of pine tree that make the pinewood strong and durable.
Answer the following in short.
Define transpiration in plants.
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.
Why is it necessary to maintain a normal osmotic concentration of the blood?
Fill in the blanks in the following passage to make it a meaningful description.
In a nephron, the ______ flows through the ______ under great pressure. The reason for this great pressure is that the ______ (outgoing) ______ is narrower than the ______ (incoming). This high pressure causes the ______ part of the blood to filter out from the ______ into the ______ capsule.
Define the following term :
Renal pelvis
Explain the difference between the excretory system of humans and plants.
Label the diagram given below :
The following diagram represents a mammalian kidney tubule (nephron) and its blood supply.
Parts indicated by the guidelines 1to 8 are as follows:
1. Afferent arteriole from renal artery
2. Efferent arteriole
3. Bowman's capsule
4. Glomerulus
5. Proximal convoluted tubule with blood capillaries
6. Distal convoluted tubule with blood capillaries
7. Collecting tubule
8. U-shaped loop of Henle
Study the diagram and answer the question that follow:
Where is most water reabsorbed ?
Name the Following
The substance found in excess in the urine of a diabetic patient.
Give Technical Term:
The organ which filters out urea and uric acid from the bloodstream.
Choose the correct option.
Visceral layer : Podocytes :: PCT : ________.
Choose the correct option.
Deproteinised plasma is not found in ______.
Osmoregulation maintains the osmolarity of blood at about ______.
The main nitrogenous waste formed in the human body:
