Physiological phase represented by the term diastole: ____________?
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Answer: B. Relaxation of heart
Explanation
Diastole represents the specific physiological phase when the cardiac muscle fibers relax completely. During this relaxation period, the heart chambers expand and passively fill with incoming blood. This critical phase allows the heart muscle to recover before initiating the next contraction cycle. The complete cardiac cycle consists of alternating periods of muscular contraction and relaxation phases. Blood pressure measurements typically record both systolic pressure and lower diastolic pressure values. Proper diastolic timing ensures adequate coronary blood flow to nourish the heart muscle itself.
Prolonged abnormalities in diastolic filling can severely impair overall cardiac output and physical endurance. Cardiologists evaluate diastolic function during echocardiograms to detect early signs of heart failure. Relaxation of the ventricles is essential for maintaining efficient circulation throughout the entire human body. Contraction of the heart refers specifically to the systolic phase of the cardiac cycle. Volume of heart describes the physical capacity or stroke volume rather than a temporal phase. Output of heart refers to the total volume of blood pumped per minute by the ventricles.
- Subject
- Physical Education
- Category
- Physical Education
- Topic
- —
- Difficulty
- medium
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