CAIE A-Level Biology AS 8.1.7 Blood Cells Questions

Describe red cells, white cells and platelets using evidence from each question and mark scheme.

Exam points

Describe the structure and functions of red blood cells, white blood cells and platelets.

[Maximum number: 2]

Fig. 5.1 is a longitudinal section of a capillary in muscle tissue as viewed with a transmission electron microscope.

Fig. 5.1

magnification $\times 2000$

State the evidence, visible in Fig. 5.1, that identifies the cells inside the capillary as red blood cells.

any two from:

no nucleus ;

no organelles / uniform appearance / homogenous cytoplasm ;

(some are) biconcave shape / described ;
A cells have different shapes

same, width / size, as the lumen of the capillary ;

A same width as capillary / diameter of cells is $6-7 \mu \mathrm{~m}$

R colour / shading / AW

All question bank results loaded

CAIE A-Level Biology AS 8.1.7 Blood Cells Questions question 1