Briefly describe the followings 
(a) anaemia
(b) angina pectoris
( c) atherosclerosis
(d) hypertenswn
(e) heart failure
(f) erythroblastosis foetalis

Explanation

(a) Anaemia. It is characterised by decrease in RBC count. It may due to a number of reasons e.g. deficiency of iron or folic acid or B, in diet, excessive bleeding due to injury or menstruation, diseases like tuberculosis and lung cancer, fall in rate of erythropoieisis, etc.
(b) Angina Pectoris. It is characterised by acute chest pain due to reduced `O_2` supply to heart muscles due to coronary sclerosis which reduces blood flow.
(e) Heart failure. It is characterised by breathlessness, increased rate of heart beat, congestion of the lungs, reduced pumping action of heart, etc. It may be due to rheumatic or ischaemic or hypertensive heart disease, cardio myopathy, etc.
(f) Erythroblastosis foetalis. It is characterised by death of second baby onward due to clumping and breakdown of RBCs of `Rh^+` foetus developing in uterus of `Rh^-` female whose husband is `Rh^+`. It is due to `Rh^-` incompatibility of `Rh^-` mother and `Rh^+` foetus.