Question

Read the following statements and find out the incorrect statements.

a. Blood is a loose connective tissue consisting of a fluid matrix, plasma and formed elements.

b. Plasma is a straw coloured, viscous fluid constituting nearly 90-92 percent of the blood.

c. 55 percent of plasma is water and proteins contribute 6-8 percent of it.

d. Fibrinogen is needed for clotting or coagulation of blood.

e. Factors for clotting of blood are present in the plasma in an inactive form.

Answer 1

Incorrect statements

Statement a

Blood is a loose connective tissue consisting of a fluid matrix, plasma and formed elements.

Elaboration

Blood is a specialised fluid connective tissue which helps in transporting essential nutrients to various tissues in the body.

Hence, blood is not a loose connective tissue but a specialised connective tissue.

Statement b

Plasma is a straw coloured, viscous fluid constituting nearly 90-92 percent of the blood.

Elaboration

Plasma is the straw coloured viscous fluid which forms 55% of the total blood volume. Hence, plasma does not form 90-92 percent of the blood but 55% of it.

Statement c

55 percent of plasma is water and proteins contribute 6-8 percent of it.

Elaboration

Plasma is the straw coloured viscous fluid which forms 55% of the total blood volume. Plasma is composed of three components:

• Water: Forms 90-92% of plasma
• Proteins: Forms 6-8% of plasma
• Dissolved components: Forms less than 1% of plasma

Hence, 90-92% of plasma is water, not 55%. Also, 6-8% of the plasma volume is contributed by the proteins.

Final answer: (A) a, b and c