Question

Give one reason for the following:

1. Blood is fluid connective tissue.
2. Skeletal muscles are voluntary muscles.
3. Heart muscles are involuntary in nature.

Answer 1

The blood and the lymph are the fluid connective tissues that link different parts of the body. The cells of the connective tissue are loosely spaced and are embedded in an intercellular matrix.

1. Blood: Blood contains corpuscles which are red blood cells (erythrocytes), white blood cells (leucocytes), and platelets. In this fluid connective tissue, blood cells move in a fluid matrix called plasma. The plasma contains inorganic salts and
   organic substances. It is a main circulating fluid that helps in the transport of nutrient substances.
2. They work under our control and are also known as voluntary muscles. They are not under the control of our will and so are called involuntary muscles.
3. Cardiac muscle: It is a special contractile tissue present in the heart. The muscle fibers are cylindrical, branched, and uninucleate The branches join to form a network called intercalated discs which are unique distinguishing features of the cardiac muscles. The contraction of cardiac muscle is involuntary and rhythmic.