CH 7 SUM: Transport systems in animals
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Questions and Answers

Which phase of the cardiac cycle involves the contraction of the atria?

  • Pulmonary Systole
  • Diastole (General Relaxation)
  • Atrial Systole (correct)
  • Ventricular Systole

    • What is the duration of Atrial Systole in the cardiac cycle?

  • 0.5 seconds
  • 0.1 seconds (correct)
  • 0.3 seconds
  • 0.4 seconds

    • Which valves open during Atrial Systole to allow blood into the ventricles?

  • Mitral and Pulmonary valves
  • Bicuspid and Pulmonary valves
  • Tricuspid and Bicuspid valves (correct)
  • Tricuspid and Aortic valves

    • Which phase of the cardiac cycle involves the contraction of the ventricles?

    <p>Ventricular Systole</p> Signup and view all the answers

    What is the duration of Ventricular Systole in the cardiac cycle?

    <p>0.3 seconds</p> Signup and view all the answers

    Which valves close during Ventricular Systole to prevent backflow of blood?

    <p>Tricuspid and Bicuspid valves</p> Signup and view all the answers

    Which phase of the cardiac cycle involves the relaxation of both atria and ventricles?

    <p>Diastole (General Relaxation)</p> Signup and view all the answers

    Which part of the heart does oxygenated blood return to?

    <p>Left atrium</p> Signup and view all the answers

    What primarily controls the heartbeat?

    <p>SA node</p> Signup and view all the answers

    Which of the following factors does NOT influence the heartbeat?

    <p>Blood glucose levels</p> Signup and view all the answers

    What stimulates the right atrium to beat faster during physical activities?

    <p>Activation of stretch receptors</p> Signup and view all the answers

    What triggers an increase in heart rate during exercise?

    <p>Increased CO2 levels</p> Signup and view all the answers

    What is the main benefit of regular exercise for cardiovascular health?

    <p>Prevention of cardiovascular diseases</p> Signup and view all the answers

    What is a common cardiovascular disease that can be managed with lifestyle adjustments?

    <p>High blood pressure</p> Signup and view all the answers

    What is the final destination of oxygenated blood from the left ventricle?

    <p>Aorta</p> Signup and view all the answers

    What is the main function of the SA node in the cardiac cycle?

    <p>To generate electrical impulses that cause the atria to contract</p> Signup and view all the answers

    What prevents the backflow of blood during Ventricular Systole?

    <p>The closing of the tricuspid and bicuspid valves</p> Signup and view all the answers

    What is the duration of Diastole in the cardiac cycle?

    <p>0.4 seconds</p> Signup and view all the answers

    What is the final destination of deoxygenated blood from the right ventricle?

    <p>The lungs via the pulmonary arteries</p> Signup and view all the answers

    What is the main benefit of regular exercise for cardiovascular health?

    <p>It strengthens the heart muscles and improves efficiency</p> Signup and view all the answers

    What primarily controls the heartbeat?

    <p>The SA node</p> Signup and view all the answers

    Which valves open during Diastole to allow blood to fill the atria?

    <p>The semilunar valves</p> Signup and view all the answers

    What process raises CO2 levels in the blood during physical activities?

    <p>Increased cellular respiration</p> Signup and view all the answers

    Which part of the body is responsible for signaling the heart to increase its contraction rate in response to heightened demand for oxygen?

    <p>Carotid arteries and aorta</p> Signup and view all the answers

    What effect does physical expansion of the right atrium have on the heartbeat during physical activities?

    <p>Increases heart rate</p> Signup and view all the answers

    Which of the following is NOT a factor that influences the heartbeat?

    <p>Blood glucose levels</p> Signup and view all the answers

    What causes the right atrium to beat faster during physical activities?

    <p>Higher CO2 levels in the blood</p> Signup and view all the answers

    Which of the following is NOT a common cardiovascular disease that can be managed with lifestyle adjustments?

    <p>Pneumonia</p> Signup and view all the answers

    What is the primary function of the SA node in the heart?

    <p>Acts as the natural pacemaker of the heart</p> Signup and view all the answers

    What happens during Ventricular Systole in the cardiac cycle?

    <p>Contraction of the ventricles</p> Signup and view all the answers

    What is the role of the SA node in the cardiac cycle?

    <p>It generates an electrical impulse for atrial contraction</p> Signup and view all the answers

    During which phase of the cardiac cycle do the tricuspid and bicuspid valves close?

    <p>Ventricular Systole</p> Signup and view all the answers

    What happens as a result of the contraction during Atrial Systole?

    <p>Blood is pushed into the ventricles</p> Signup and view all the answers

    Where does blood primarily fill from during Diastole in the cardiac cycle?

    <p>From the superior and inferior vena cava</p> Signup and view all the answers

    What is the function of the semilunar valves during Diastole?

    <p>To prevent backflow of blood into the atria</p> Signup and view all the answers

    Where does blood move after leaving the right ventricle in the cardiac cycle?

    <p>To the lungs for oxygenation</p> Signup and view all the answers

    What initiates the contraction of the ventricles during Ventricular Systole in the cardiac cycle?

    <p>AV node impulse traveling to atria</p> Signup and view all the answers

    Which of the following is a mechanism by which physical activities accelerate the heartbeat besides increasing CO2 levels?

    <p>Physical expansion of the right atrium</p> Signup and view all the answers

    Which of the following is NOT a cardiovascular disease that can be managed or prevented through lifestyle adjustments and medical interventions?

    <p>Congenital heart defects</p> Signup and view all the answers

    Which of the following does NOT describe the role of the SA node in the heart?

    <p>Controls the contraction of the ventricles</p> Signup and view all the answers

    Which of the following is NOT a factor that can influence the rate and rhythm of the heartbeat?

    <p>Blood glucose levels</p> Signup and view all the answers

    Which of the following is NOT a common misconception about cardiovascular health management?

    <p>Cardiovascular diseases can be managed through lifestyle adjustments and medical interventions</p> Signup and view all the answers

    Which of the following is NOT a phase in the cardiac cycle?

    <p>Ventricular Diastole</p> Signup and view all the answers

    Which of the following is NOT a mechanism by which increased cellular respiration raises CO2 levels in the blood during physical activities?

    <p>Decreased removal of CO2 by the lungs</p> Signup and view all the answers

    Which of the following is NOT a receptor that can be stimulated to signal the heart to increase its contraction rate?

    <p>Thermoreceptors in the skin</p> Signup and view all the answers

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