N580. Test 3. Quiz 7. Chapters 17-20
How are events of the cardiac cycle reflected in pressure and volume changes within
the cardiac chambers? DIASTOLE - answerDuring diastole the ventricles are relaxed
and blood flows in from the atria through open AV valves. Toward the end of ventricular
diastole, the atrial pressure rises, leading to atrial contraction, which squeezes more
blood through the AV valves into the ventricles.
How are events of the cardiac cycle reflected in pressure and volume changes within
the cardiac chambers? SYSTOLE - answerSystole includes isovolumic contraction,
causing intraventricular pressure to rise and AV valves to close; the rise in ventricular
pressure exceeds aortic pressure and the valves are forced open, leading to ventricular
ejection. Ejection of blood into the aorta causes a rise in aortic pressure and a fall in
ventricular pressure and volume with closing of the semilunar valve and isovolumic
relaxation.
atrial systole - answer
early ventricular systole - answer
late ventricular systole - answer
early ventricular diastole - answer
early to mid-ventricular diastole - answer
Diastole. Atria fill with blood which begins to flow into ventricles as soon as their walls
relax. - answer
Atrial Systole. Contraction of the atria pumps blood into the ventricles. - answer
Ventricular Systole. Contraction of the ventricles pumps blood into aorta and pulmonary
arteries. - answer
Atrial systole. Atria contract.
AV valves open, semilunar valves closed. - answer
Early ventricular systole. Atria relax. Ventricles contract. AV valves forced closed.
Semilunar valves still closed. - answer
Late ventricular systole. Atria relax, ventricles contract. AV valves remain closed.
Semilunar valves forced open. - answer
, Early ventricular diastole. Atria and ventricles relax. AV valves and semilunar valves
closed. Atria begin passively filling with blood. - answer
Late ventricular diastole. Atria and ventricles relax, atria passively fill with blood as AV
valves open. Semilunar valves closed. - answer
Vena Cava. 2-6 mm Hg - answer
Pulmonary artery.
SYSTOLIC: 15-28 mm Hg
DIASTOLIC: 4-12 mm Hg - answer
Right Ventricle.
SYSTOLIC: 15-28 mm Hg
DIASTOLIC: 0-8 mm Hg - answer
Left Ventricle.
SYSTOLIC: 100-120 mm Hg
DIASTOLIC: 4-12 mm Hg - answer
AORTA
SYSTOLIC: 100-120 mm Hg
DIASTOLIC: 60-80 mm Hg - answer
LEFT ATRIUM
AVG: 4-12 mm Hg - answer
RIGHT ATRIUM
AVG: 0-8 mm Hg - answer
Pulmonary Vein.
AVG: 4-12 mm Hg - answer
What factors affect the blood supply to myocardial tissue? - answerCoronary blood flow
is centrally regulated by the AUTONOMIC nervous system and locally by
autoregulation. The amount of coronary flow depends on driving pressure and coronary
resistance, which is dependent on the vessel diameter.
How does sarcomere cross-bridge formation lead to muscle cell contraction? -
answerContraction of cardiac muscle is accomplished by shortening of individual
sarcomeres. This is due to increased overlap of actin and myosin filaments. Myosin
heads bind to specific sites on actin and pull the thin filaments toward the center of the
sarcomere, resulting in contraction.
*What is the process of excitation-contraction coupling in heart muscle cells?* -
answerThe spread of an action potential over cardiac muscle cell surfaces results in
How are events of the cardiac cycle reflected in pressure and volume changes within
the cardiac chambers? DIASTOLE - answerDuring diastole the ventricles are relaxed
and blood flows in from the atria through open AV valves. Toward the end of ventricular
diastole, the atrial pressure rises, leading to atrial contraction, which squeezes more
blood through the AV valves into the ventricles.
How are events of the cardiac cycle reflected in pressure and volume changes within
the cardiac chambers? SYSTOLE - answerSystole includes isovolumic contraction,
causing intraventricular pressure to rise and AV valves to close; the rise in ventricular
pressure exceeds aortic pressure and the valves are forced open, leading to ventricular
ejection. Ejection of blood into the aorta causes a rise in aortic pressure and a fall in
ventricular pressure and volume with closing of the semilunar valve and isovolumic
relaxation.
atrial systole - answer
early ventricular systole - answer
late ventricular systole - answer
early ventricular diastole - answer
early to mid-ventricular diastole - answer
Diastole. Atria fill with blood which begins to flow into ventricles as soon as their walls
relax. - answer
Atrial Systole. Contraction of the atria pumps blood into the ventricles. - answer
Ventricular Systole. Contraction of the ventricles pumps blood into aorta and pulmonary
arteries. - answer
Atrial systole. Atria contract.
AV valves open, semilunar valves closed. - answer
Early ventricular systole. Atria relax. Ventricles contract. AV valves forced closed.
Semilunar valves still closed. - answer
Late ventricular systole. Atria relax, ventricles contract. AV valves remain closed.
Semilunar valves forced open. - answer
, Early ventricular diastole. Atria and ventricles relax. AV valves and semilunar valves
closed. Atria begin passively filling with blood. - answer
Late ventricular diastole. Atria and ventricles relax, atria passively fill with blood as AV
valves open. Semilunar valves closed. - answer
Vena Cava. 2-6 mm Hg - answer
Pulmonary artery.
SYSTOLIC: 15-28 mm Hg
DIASTOLIC: 4-12 mm Hg - answer
Right Ventricle.
SYSTOLIC: 15-28 mm Hg
DIASTOLIC: 0-8 mm Hg - answer
Left Ventricle.
SYSTOLIC: 100-120 mm Hg
DIASTOLIC: 4-12 mm Hg - answer
AORTA
SYSTOLIC: 100-120 mm Hg
DIASTOLIC: 60-80 mm Hg - answer
LEFT ATRIUM
AVG: 4-12 mm Hg - answer
RIGHT ATRIUM
AVG: 0-8 mm Hg - answer
Pulmonary Vein.
AVG: 4-12 mm Hg - answer
What factors affect the blood supply to myocardial tissue? - answerCoronary blood flow
is centrally regulated by the AUTONOMIC nervous system and locally by
autoregulation. The amount of coronary flow depends on driving pressure and coronary
resistance, which is dependent on the vessel diameter.
How does sarcomere cross-bridge formation lead to muscle cell contraction? -
answerContraction of cardiac muscle is accomplished by shortening of individual
sarcomeres. This is due to increased overlap of actin and myosin filaments. Myosin
heads bind to specific sites on actin and pull the thin filaments toward the center of the
sarcomere, resulting in contraction.
*What is the process of excitation-contraction coupling in heart muscle cells?* -
answerThe spread of an action potential over cardiac muscle cell surfaces results in
