08 Respiration and Circulation - part 08 - Circulatory System in Human

 

08 Respiration and Circulation - part 08 - Circulatory System in Human


Circulatory System in Human :
  • The human circulatory system is composed of -  
  1. Blood vascular system and 
  2. Lymphatic system.
Blood vascular system :Consists of -
  1. Blood
  2. Heart and 
  3. Blood vessels. 
  • Responsible for various functions like -  
  1. Transport
  2. Homeostasis and 
  3. Protection.
Blood Composition and Coagulation : 
  • Study of blood is called haematology. 
  • An average adult has about 4 to 6 liters of blood. 
  • Red coloured fluid connective tissue derived from embryonic mesoderm. 
  • Slightly alkaline (pH 7.4), salty and viscous fluid. 
  • Heaviere then water. 
  • Has two main components- 
  1. Fluid plasma (55%) and 
  2. Formed elements i.e. blood cells (44%). 
  • These can be separated by centrifugation.
Plasma : 
  • Constitutes 55% of the blood. 
  • Straw-coloured, slightly alkaline, viscous fluid and consists of following:

Formed elements :
  • The blood cells that are produced in the body are collectively called formed elements.
  • Human blood contains three types of formed elements as -  
  1. Red blood corpuscles (RBCs)
  2. White blood corpuscles (WBCs) and 
  3. Platelets.

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