Chapter 8
What happens during ventricular systole?
The atrioventricular valves are closed.
What is unique about the great saphenous vein?
It is the longest vein in the body.
Atrioventricular (AV) valves prevent blood from flowing backward into the
atria
From the capillaries of the abdominal organs and hind limbs, blood flows to the
posterior vena cava
Describe the pressures in the atria and ventricles that would cause the opening of the AV valves.
Pressure in the atria would be greater than the pressure in the ventricles.
Which of the following is not a valve?
SA node
What is the correct order of the intrinsic conducting system?
SA node, AV node, AV bundle, bundle branches, Purkinje fibers
Which of the choices represents the order of vessels through which blood passes after leaving the heart?
artery, arteriole, capillary, venule, vein
Increased pressure in the ventricles would close what valve(s)?
AV valves only
The characteristic lub-DUB sounds that a doctor listens for using a stethoscope is due to
closing of the atrioventricular valves followed by closing of the semilunar valves
Which blood vessel has the lowest blood pressure?
inferior vena cava
The movement of blood through the pulmonary circuit transports
oxygenated blood from the lungs to the heart
The protective sac that encases the heart and anchors it to surrounding structures is the
pericardium
Blood pressure deals with
the force of blood against the walls of the blood vessel
The heart is actually (one, two, or three) pumps?
two pumps
Which is not associated with the body trying to lower blood pressure (BP)?
vasoconstrict arteries
Isovolumetric relaxation and ventricular filling (two phases of the cardiac cycle) take place during
ventricular diastole
Which blood vessel(s) contains valves?
venules and veins
Which blood vessel lacks smooth muscle?
capillary
What happens during the QRS portion of an EKG?
The ventricles contract.
How do veins differ from arteries?
Veins send blood to the heart.
Which blood vessels are directly involved with gas exchange?
capillaries
Which blood vessel is best suited for exchange of gases and nutrients with the surrounding tissue?
capillary
Which of the following is a branch of the common iliac artery?
femoral artery
What causes the aortic semilunar valve to close?
greater pressure in the aorta than in the left ventricle
Where are papillary muscles located?
left and right ventricles
From the pulmonary veins, blood flows to the
left atrium
Oxygen-rich blood directly enters which chamber(s) of the heart?
left atrium
Which heart chamber receives blood from the pulmonary veins?
left atrium
Which chamber pumps oxygenated blood out the aorta to the systemic circuit?
left ventricle
What keeps blood flowing in one direction, especially in regions of low blood pressure?
muscular pump, breathing, and valves
A heart attack occurs as a result of
narrowing or blockage of the coronary arteries
What is the function of chordae tendinae?
prevent the atrioventricular (AV) valves from going into the atria
Blood returns to the heart via the
pulmonary veins
Which of the following is not found in lymph?
red blood cells
Which vein(s) carry oxygenated blood?
right and left pulmonary veins
From the anterior vena cava, blood flows to the
right atrium
Which chamber receives blood from the superior and inferior vena cavae?
right atrium
What is the correct order of blood flow for the pulmonary circuit?
right atrium, tricuspid valve, right ventricle, pulmonary semilunar valve, pulmonary trunk, pulmonary arteries
Which blood vessel takes blood from the heart muscle and returns blood back to the heart?
right cardiac vein
Which heart chamber pumps unoxygenated blood out the pulmonary trunk?
right ventricle
A test was done, and an embolism was found in a carotid artery. What most likely will occur with this patient?
stroke