(a)[1]
Fill in the table by finding the percentage of platelets. Put your answer in Table 5.1 to two decimal places.
(b)[4]
State the function of platelets in blood and outline the process they take part in.
(c)[1]
State what lymphocytes do in defence against pathogens.
(d)[2]
When the same pathogen infects again for a second time, the lymphocyte response is much quicker. Explain how this happens.
(e(i))[3]
Describe how lymphocyte numbers change after HIV infection.
(e(ii))[3]
Describe the body effects of an untreated HIV infection as shown in Fig. 5.1.