Question

Why blood is called as connective tissue and why hemoglobin present only in human blood?

Answer 1

Blood is also called as fluid connective tissue because it posses all the properties of connective tissue.
1. It connects various body parts with each other.
2. Forms packing around various body organs so called as packing tissue.
3. It is mesodermal in origin.
4. It has all the three components of a connective tissue i.e. cells, fibers and matrix.
5. A fibroblast is the most important cell of connective tissues which is present in blood.

The color of blood is related to Hemoglobin, containing iron, is red and is found in all vertebrates (animals having a backbone) and a few invertebrates (animals lacking a backbone).