The murmuring sound in the heart takes place due to

Select the correct option regarding the disorders of the circulatory system.

Blood pressure increases and heart rate decreases in response to

Briefly describe the following (Any four):
$(a)$ Anaemia $(b)$ Angina Pectoris $(c)$ Atherosclerosis $(d)$ Hypertension $(e)$ Heart failure $(f)$ Erythroblastosis foetalis

Given below are the abnormal conditions related to blood circulation. Name the disorders.
$(a)$ Acute chest pain due to failure of $O_{2}$ supply to heart muscles
$(b)$ Increased systolic pressure

What is a primary symptom of oedema?