What is the condition called when the heart rate is lower than normal?

Which of the following diseases is also known as atherosclerosis?

Assertion: Saline water is not given to patients of hypertension.
Reason: Saline water can cause vomiting and may drop blood pressure suddenly causing cardiac arrest.

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

The condition in which the heart is not pumping blood effectively enough to meet the needs of the body is called:

Congestion of the lungs is one of the main symptoms in