What do coronary arteries deliver to the cardiac muscle?

Coronary arteries are responsible for supplying blood to the heart muscle, ensuring that it receives the essential substances needed for its function. The correct choice identifies that these arteries deliver both oxygen and glucose to the cardiac muscle. Oxygen is crucial for cellular respiration, which allows heart cells to produce energy. Glucose, a vital energy substrate, is also delivered through the bloodstream enabling the heart to maintain its pumping action.

This blood supply ensures that the cardiac muscle can efficiently perform its role in circulating blood throughout the body. Without an adequate supply of both oxygen and glucose, heart muscle cells would not be able to generate the energy necessary for contraction, which could lead to impaired heart function or damage. Therefore, the choice that emphasizes the importance of both oxygen and glucose succinctly captures the key role of coronary arteries in sustaining cardiac health.