Erythrocytes can come out of blood capillaries by diapedesis.
Blood is commonly called red vascular connective tissue as its matrix is fluidy, mobile and fibre-free, and is red-coloured due to presence of haemoglobin in its RBCs. Blood is formed of two components: Plasma and Blood corpuscles. Its blood corpuscles are of three types Erythrocytes, Leucocytes and blood platelets. Leucocytes are of five types which are adapted to perform different functions. Answer the following questions related to blood: (i) List two structural peculiarities of its RBCs of human blood. (ii) Tabulate two differences between its five types of leucocytes. (iii) Define diapedesis .
Give the meaning of diapedesis.
Which corpuscles can undergo diapedesis?
Assertion: WBCs accumulate at site of wounds by diapedesis. Reason: It is squeezing of leucocytes from endotheium.
(A) What is the function of velamen ? (B) What is plerome ? (C) What is quiescent centre ? (D) What is the function of collenchyma ? (E) What is the chemical nature of cuticle ?
