Question

The average blood flow through kidneys per minute is
1. 1000 cc
2. 1200 cc
3. 200 cc
4. 500 cc

Answer 1

Correct Answer - Option 2 : 1200 cc

The correct answer is 1200 cc.

• The average blood flow through kidneys per minute is 1200 cc.
• Blood:
  • Blood is composed of:
    • Plasma  – the fluid part of the blood and is composed of  90% of water.
    • Red blood cells, white blood cells, and platelets constitute the solid part of blood.
  • Blood is the body’s fluid connective tissue, and it forms a vital part of the human circulatory system.
  • Its main function is to circulate nutrients, hormones, minerals, and other essential components to different parts of the body.
  • Blood flows through a specified set of pathways called blood vessels.
  • The organ which is involved in pumping blood to different body parts is the heart.
  • Blood cells, blood plasma, proteins, and other mineral components (such as sodium, potassium, and calcium) constitute human blood.

• Kidneys:
  • The kidney is an organ that maintains water balance and expels metabolic wastes.
  • Primitive and embryonic kidneys consist of two series of specialized tubules that empty into two collecting ducts, the Wolffian ducts (see Wolffian duct).
  • The more advanced kidney (metanephros) of adult reptiles, birds, and mammals is a paired compact organ whose functional units, called nephrons, filter initial urine from the blood, reabsorb water and nutrients, and secrete wastes, producing the final urine, which is expelled.
  • Reptilian and avian kidneys are made up of many tiny lobules that, in birds, are combined into three or more lobes.
  • Collecting tubules from each lobule empty into a separate branch of the ureter.
  • Reptiles have relatively few nephrons (from 3,000 to 30,000 in lizards), while birds have a great number (around 200,000 in a fowl, twice as many as in a mammal of comparable size).