Of the four main classes of connective tissue, which has the least solid ground substance?
a) connective tissue proper
b) cartilage
c) bone tissue
d) blood

The answer is D: Blood

Explanation:

The fundamental substance is part of the extracellular matrix and comprises a set of proteins on which mineral salts are fixed to form the connective tissue. They are always attached to the fibers (collagen, elastin, reticulin). The fundamental substance of the blood is going to be found in the blood plasma, being therefore the least solid.

Blood

Explanation:

In the fluid connective tissue the least solid ground substance is found in blood. Blood is one of the four main connective tissue which transports various materials from one place to another.

It is a fluid containing salts, nutrients and dissolved proteins. The watery fluid carrying oxygen from heart to the vital organs and then carrying carbon dioxide from vital organs to the heart.

Hence, the correct answer is blood.

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