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Answer the following

Question:

Answer the following

a. Name the major site where RBCs are formed.

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

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

Solution:

a. In the 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. SA node or Sino Atrial Node is responsible for the rhythmic activity.

c. Reptilians have a three-chambered heart (2 atria and 1 ventricle) whereas crocodiles have a 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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