Question

Study the following diagram carefully and then answer the questions that follow:

(a) name the cell labelled 1.

(b) Identify the phenomenon occurring in A.

(c) Mention two structural differences between 1 and 2.

(d) Name the process occurring in B and C and state the importance of this process in the human body

Answer 1

(a) 1 - Red blood cell

(b) Diapedesis

| RBC | WBC |
| They lack a nucleus. | They have a nucleus. |
| They are biconcave and disc - shaped. | They are spherical and have different sizes. |

(d) The process which occurs in B and C is phagocytosis. In this process, the WBCs engulf the foreign particles and ** them, thus preventing the occurrence of **.