Heart Quiz
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5 questions, one answer each
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1. Which of the following is the correct function of the septum in the mammalian heart?
- A. To separate oxygenated and deoxygenated blood and prevent mixing
- B. To pump blood out of the heart into the arteries
- C. To allow blood to flow between the atria and ventricles
- D. To support the coronary arteries that supply the heart muscle
2. Why is the left ventricle wall significantly thicker than the right ventricle wall?
- A. The left ventricle needs to pump blood around the entire body, requiring more muscle
- B. The right ventricle receives more blood from the atrium
- C. Thick muscle walls prevent coronary heart disease
- D. The left ventricle must pump blood to the lungs at higher pressure
3. A student measures their resting heart rate as 70 beats per minute. After running for 5 minutes, their heart rate increases to 140 beats per minute. Which statement best explains this increase?
- A. The student's heart is developing coronary heart disease
- B. Increased muscle activity demands more oxygen, so the heart beats faster to pump more oxygenated blood to the tissues
- C. The atrioventricular valves have become damaged and cannot close properly
- D. The student's septum is no longer separating oxygenated and deoxygenated blood effectively
4. Which combination of risk factors for coronary heart disease would be of greatest concern for a sedentary 55-year-old male smoker with high blood pressure?
- A. Age and sex only
- B. Smoking and lack of exercise only
- C. Age, sex, smoking, lack of exercise, and stress from high blood pressure
- D. Only genetic predisposition matters in this case
5. During the cardiac cycle, the atrioventricular valves open while the semilunar valves remain closed. What is happening at this moment?
- A. Blood is being ejected from the ventricles into the arteries
- B. Blood is flowing from the atria into the ventricles during atrial contraction and ventricular relaxation
- C. The coronary arteries are supplying oxygen-rich blood to the heart muscle
- D. The septum is contracting to prevent blood mixing