For the heart muscle, the most important substance in the blood is:
A)glucose
B)iron
C)protein
D)oxygen

Name: For the heart muscle, the most important substance in the blood is: A)glucose B)iron C)protein D)oxygen
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Question

Quizplus · Accepted Answer

The heart muscle needs a constant supply of oxygen to function properly. Without oxygen, the heart muscle can become damaged or die, leading to a heart attack. Glucose, iron, and protein are also important for the body but are not as critical for the heart muscle as oxygen.

For the Heart Muscle, the Most Important Substance in the Blood