Sequence Reasoning
Q: Why must blood pass through the lungs before entering the left side of the heart?
A: Blood must pick up oxygen and release carbon dioxide in the lungs before being pumped to the body.
Q: Why is the tricuspid valve important for correct blood flow?
A: It prevents blood from flowing backward into the right atrium.
Q: How does blocking the pulmonary artery affect oxygen levels?
A: Blood cannot reach the lungs, so it cannot receive oxygen.
Q: Why is oxygen exchange necessary before blood returns to the left atrium?
A: The left side pumps blood to the body and needs oxygen-rich blood.
Q: Explain why blood does not go directly from the right ventricle to the body.
A: It must go to the lungs first to receive oxygen.
Q: Explain what would happen if blood skipped the right ventricle.
A: Blood would not be pumped to the lungs, so it would not receive oxygen, lowering oxygen levels in the body.
Q: Explain how a leaky pulmonary valve would affect blood flow to the lungs.
A: Blood could flow backward into the right ventricle, reducing blood sent to the lungs.
Q: Why would damage to the left ventricle reduce energy during activity?
A: The left ventricle pumps blood to the body, and damage reduces oxygen delivery.
Q: Why do pulmonary veins carry oxygen-rich blood even though they are veins?
A: Veins are defined by direction to the heart, not oxygen content.
Q: Correct this: “The aorta carries blood to the lungs.”
A: The pulmonary artery carries blood to the lungs; the aorta carries blood to the body.
Q: Why does blood move from the right atrium to the right ventricle before going to the lungs?
A: The right ventricle has stronger muscle needed to pump blood to the lungs.
Q: Compare the role of the mitral valve and the aortic valve.
A: The mitral valve controls blood entering the left ventricle, while the aortic valve controls blood leaving it.
Q: Explain how slowed blood flow through the lungs affects the body.
A: Less oxygen enters the blood, lowering energy levels.
Q: Compare oxygen levels entering and leaving the lungs.
A: Blood entering has low oxygen; blood leaving has high oxygen.
Q: Why can’t the left atrium receive blood from the vena cava?
A: The vena cava carries oxygen-poor blood to the right atrium.
Q: Explain why blood must pass through valves in a specific order.
A: Valves prevent backflow and ensure blood moves in one direction through the heart.
Q: What would happen if the aortic valve did not open fully?
A: Less oxygen-rich blood would reach the body, causing fatigue and weakness.
Q: What would happen if blood flowed backward into the right atrium?
A: Efficient circulation would decrease, lowering oxygen delivery.
Q: How would poor lung function affect heart blood flow?
A: Blood would carry less oxygen, affecting the entire body.
Q: Correct and explain: “Valves are optional for blood flow.”
A: Valves are essential because they prevent backflow.
Q: Predict how switching the pulmonary artery and pulmonary veins would affect blood flow.
A: Oxygen-rich and oxygen-poor blood would mix, preventing proper oxygen delivery.
Q: Explain how valve failure could lead to oxygen-poor blood reaching the body.
A: Backflow could mix blood or reduce oxygen delivery.
Q: Predict how increased heart rate helps during exercise.
A: It moves blood faster, delivering more oxygen to muscles.
Q: Predict how low oxygen levels affect muscles.
A: Muscles fatigue quickly and perform poorly.
Q: Analyze how mixing oxygenated and deoxygenated blood affects survival.
A: The body would not receive enough oxygen to function properly.