Final answer:
The heart muscle is nourished by the coronary arteries, which branch from the aorta after it exits the left ventricle and supply the heart with oxygen-rich blood.
Step-by-step explanation:
The heart muscle receives its blood supply from the d. coronary arteries. These arteries arise from the first section of the aorta after it leaves the left ventricle and are essential for delivering oxygen-rich blood to the cardiac muscle tissue.
The coronary arteries are important components of the coronary circulation system which is responsible for nourishing the heart's own muscle cells. These arteries branch out to cover the surface of the heart, eventually leading into smaller arteries and capillaries where oxygen exchange occurs. The heart requires a constant supply of blood through these vessels to function properly, as it is a highly active organ. When the heart muscle relaxes during the cardiac cycle, the coronary circulation reaches its peak, ensuring that the cardiac tissue receives adequate blood flow and nutrients.
The coronary arteries branch from the aorta and surround the outer surface of the heart, providing oxygenated blood to the myocardium (heart muscle) and other components of the heart.
Example: The coronary arteries supply the heart with oxygen and nutrients, allowing the heart muscle to function properly.