Answer the following

a. Name the major site where RBCs are formed.


b. Which part of heart is responsible for initiating and maintaining its rhythmic activity?


c. What is specific in the heart of crocodiles among reptilians?


a. In early embryonic stage RBC’s are produced in: Yolk Sac


In later embryonic stage RBC’s are produced in : Liver and Spleen


In mature adults RBC’s are produced in : Bone Marrow


b. Part of heart which is responsible for initiating and maintaining its rhythmic activity is SA node or Sino Atrial Node because of which it is also known as Pacemaker of the heart.


c. Reptilians have a three chambered heart (2 atria and 1 ventricle) whereas crocodiles have four chambered heart (2 atria and 2 ventricles) in which the mixing of oxygenated and deoxygenated blood does not take place.


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