PATHOLOGY

Detailed explanation-1: -capillaries – they connect the smallest arteries to the smallest veins, and help exchange water, oxygen, carbon dioxide and other nutrients and waste substances between the blood and the tissues around them.

Detailed explanation-2: -Your heart contracts (beats) when it receives an electrical impulse from your sinoatrial (SA) node. This signal is called heart conduction. The SA node is your body’s “natural pacemaker, ‘’ setting your heart’s rhythm.

Detailed explanation-3: -Like all organs, your heart is made of tissue that requires a supply of oxygen and nutrients. Although its chambers are full of blood, the heart receives no nourishment from this blood. The heart receives its own supply of blood from a network of arteries, called the coronary arteries.