Question

D. Give reasons for the following.
1. Last two ribs of rib cage are called floating ribs.
2. We do not have voluntary muscles in our heart.​

Answer 1

Answer:

1.Last two ribs of rib cage are called floating ribs because the two bottom pairs of ribs are not joined to the breast bone.

2.We do not have voluntary muscles in our heart because if heart would have made of voluntary muscles than it would have been under the control of our will.But that's absurd because heart is a pumping organ and need to beat continuously in order to supply blood to various parts of the body .... That's why it is made of involuntary muscles.