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<span>Once the pressure in the atria surpasses the pressure in the ventricles:</span>

Once the pressure in the atria surpasses the pressure in the ventricles:

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Question 11 1 pts

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<span>Systemic circulation distributes oxygen-rich blood from the left ventricle.</span>

Systemic circulation distributes oxygen-rich blood from the left ventricle.

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Question 12 1 pts

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<span>The coronary sinus is the principal vein that drains blood from the myocardium.</span>

The coronary sinus is the principal vein that drains blood from the myocardium.

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Question 13 1 pts

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<p><span>The ductus arteriosus shunts blood from the plumonary trunk into the aorta during fetal life.</span></p> <div><span> </span></div>

The ductus arteriosus shunts blood from the plumonary trunk into the aorta during fetal life.

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Question 14 1 pts

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<span>The fibrous skeleton of the heart acts as an electrical insulator (limits the spread of action potentials).</span>

The fibrous skeleton of the heart acts as an electrical insulator (limits the spread of action potentials).

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Question 15 1 pts

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<span>The left atrium receives blood from the pulmonary arteries.</span>

The left atrium receives blood from the pulmonary arteries.

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Question 16 1 pts

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<span>The semilunar valves prevent backflow of blood into the superior and inferior venae cavae.</span>

The semilunar valves prevent backflow of blood into the superior and inferior venae cavae.

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Question 17 1 pts

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<span> The term systole refers to the phase of contraction/ejection of blood. </span>

The term systole refers to the phase of contraction/ejection of blood.

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Question 18 1 pts

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<span>Auricles are “pouches” that slightly increase the capacity of the atria, allowing them to hold a greater volume of blood.</span>

Auricles are “pouches” that slightly increase the capacity of the atria, allowing them to hold a greater volume of blood.

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Question 19 1 pts

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<span>The walls of the right ventricle are the thickest because they pump blood throughout the body where there is a greater resistance to blood flow. </span>

The walls of the right ventricle are the thickest because they pump blood throughout the body where there is a greater resistance to blood flow.

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Question 20 1 pts

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<span>Valves open/close in response to pressure changes as the heart contracts/relaxes.</span>

Valves open/close in response to pressure changes as the heart contracts/relaxes.

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Question 21 0 pts

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<span>Which of the following statements regarding the heart valves is <strong><em>false</em></strong>?</span>

Which of the following statements regarding the heart valves is false?

Explanation / Answer

ANSWER IS AV VALVE OPEN 11.Systemic circulation carries oxygenated blood from the left ventricle its TRUE 12.Coronary sinus. The coronary sinus is a collection of veins joined together to form a large vessel that collects blood from the heart muscle (myocardium). It delivers less-oxygenated blood to the right atrium, as do the superior and inferior vena cavae. (TRUE) 13.TRUE The ductus arteriosus shunts blood from the plumonary trunk into the aorta during fetal life. 14.TRUE A complex framework of fibrous tissue that anchors cardiac muscle fibers, supports the heart valves and openings to the great vessels, and acts as an electrical insulator to limit the spread of action potentials to specific paths. 15.TRUEThe left atrium receives blood from the pulmonary arteries. 16.TRUE semilunar valve prevent backflow 17.TRUE The other phase of the cardiac cycle is called systole. This isthe term used to describe the contraction of the heart. 18.TRUE Auricles are “pouches” that slightly increase the capacity of the atria, allowing them to hold a greater volume of blood. 19.TRUE The walls of the right ventricle are the thickest because they pump blood throughout the body where there is a greater resistance to blood flow. 20. Valves open/close in response to pressure changes as the heart contracts/relaxes. TRUE 21.A

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