Circulatory System and Vascular Functions
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Questions and Answers

What is one function of the Thebesian veins?

  • To shunt blood into the left atrium (correct)
  • To distribute oxygenated blood to systemic circulation
  • To drain blood into the aorta
  • To supply blood directly to cardiac muscles
  • Which veins are known to empty into the right atrium via the coronary sinus?

  • Thebesian Veins
  • Pulmonary Veins
  • Superior and Inferior Vena Cava
  • Great and Middle Cardiac Veins (correct)
  • Which subdivisions compose the vascular network of the circulatory system?

  • Cerebral and Coronary systems
  • Pulmonary and Coronary systems
  • Arterial and Venous systems
  • Systemic and Pulmonary systems (correct)
  • What primarily controls pulmonary arterioles and most arterioles in systemic circulation?

    <p>Sympathetic impulses</p> Signup and view all the answers

    What is the role of the medulla oblongata in the vascular system?

    <p>Acts as a vasomotor center</p> Signup and view all the answers

    Which components make up the vascular system?

    <p>Arteries, Venules, and Capillaries</p> Signup and view all the answers

    Which feature distinguishes the Thebesian veins from other cardiac veins?

    <p>They drain directly into cardiac tissues</p> Signup and view all the answers

    Which statement is true about normal vasomotor tone?

    <p>It is continuous except in specific tissues</p> Signup and view all the answers

    What is the primary role of baroreceptors in the vascular system?

    <p>To initiate reflex adjustments to blood pressure</p> Signup and view all the answers

    Where are baroreceptors specifically located in relation to major arteries?

    <p>In the walls of carotid arteries and the aorta</p> Signup and view all the answers

    Which of the following is NOT a response triggered by the baroreceptor reflex when blood pressure decreases?

    <p>Decrease in myocardial contraction force</p> Signup and view all the answers

    What is the equation for cardiac output (CO) mentioned in the content?

    <p>CO = HR x SV</p> Signup and view all the answers

    Which nerves are associated with the baroreceptors in the carotid arteries and aorta respectively?

    <p>9th nerve for carotid and 10th nerve for aorta</p> Signup and view all the answers

    What type of vessels are arterioles considered in the context of sympathetic neural fibers?

    <p>Resistance vessels</p> Signup and view all the answers

    What is the net effect of the baroreceptor reflex in response to decreased blood pressure?

    <p>Increased cardiac output and total peripheral resistance</p> Signup and view all the answers

    Which of the following adjustments occurs as a short-term response to changes in blood pressure?

    <p>Instantaneous reflex adjustments</p> Signup and view all the answers

    What is the normal range for systemic Mean Arterial Pressure (MAP)?

    <p>80 – 100 mmHg</p> Signup and view all the answers

    Which driving pressure indicates the right atrial pressure (RAP)?

    <p>2 mmHg</p> Signup and view all the answers

    What is the formula for calculating cardiac output?

    <p>CO = SV x HR</p> Signup and view all the answers

    What is the systolic pressure in the pulmonary artery (PAP)?

    <p>25 mmHg</p> Signup and view all the answers

    What is the typical stroke volume range in milliliters?

    <p>40 – 80 ml</p> Signup and view all the answers

    How much of the total blood volume is located in the systemic circulation?

    <p>60%</p> Signup and view all the answers

    In circumstances where stroke volume increases, what typically happens to blood pressure?

    <p>It increases</p> Signup and view all the answers

    What is the normal range for central venous pressure (CVP)?

    <p>2 to 6 mmHg</p> Signup and view all the answers

    What primarily influences the distribution of pulmonary blood flow in the upright lung?

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

    In which position will blood flow primarily move to gravity-dependent areas of the lungs?

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

    Which of the following factors does NOT affect the linear distribution of blood flow in the lungs?

    <p>Airway resistance</p> Signup and view all the answers

    How does an increase in myocardial contractility affect cardiac output?

    <p>Increases cardiac output</p> Signup and view all the answers

    Which determinant of cardiac output is NOT directly related to the heart's contractility?

    <p>Pulmonary vascular resistance</p> Signup and view all the answers

    The primary reason blood flows from the apex to the base of the lungs in an upright position is due to which law?

    <p>Poiseuille’s law</p> Signup and view all the answers

    What is the role of ventricular preload in determining cardiac output?

    <p>Influences the volume of blood returning to the heart</p> Signup and view all the answers

    What is primarily measured to assess myocardial contractility?

    <p>Serial hemodynamics</p> Signup and view all the answers

    What does positive inotropism indicate regarding myocardial contractility?

    <p>Increase in myocardial contractility</p> Signup and view all the answers

    How is ventricular preload primarily reflected?

    <p>Ventricular end-diastolic pressure (VEDP)</p> Signup and view all the answers

    In cardiovascular physiology, what role does ventricular afterload play?

    <p>It is the force that hinders blood ejection from the ventricles</p> Signup and view all the answers

    What does a greater degree of myocardial fiber stretch during diastole lead to?

    <p>Greater myocardial contractility during systole</p> Signup and view all the answers

    What factors directly influence ventricular afterload?

    <p>Volume and viscosity of blood ejected</p> Signup and view all the answers

    Which formula can represent the relationship between cardiac output (CO), blood pressure (BP), and systemic vascular resistance (SVR)?

    <p>CO = BP / SVR</p> Signup and view all the answers

    How does ventricular end-diastolic volume (VEDV) correlate with cardiac output?

    <p>They are directly proportional</p> Signup and view all the answers

    What happens to myocardial contractility when negative inotropism occurs?

    <p>It decreases</p> Signup and view all the answers

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