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39 Cards in this Set
- Front
- Back
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Relative to veins with similar circumferences, arteries contain more __________.
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Smooth Muscle |
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In humans, blood returning from the big toe passes from the inferior vena cava to the __________.
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Right atrium -> right ventricle -> pulmonary trunk |
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In humans, blood returning to the heart from the head encounters heart valves in the following order_____________ before entering the aorta.
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Tricuspid -> Semilunar -> Bicuspid -> Semilunar |
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The total surface area is greatest for all the ___________.
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Capillaries |
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During diastole, the _____________.
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Ventricular muscle is relaxing |
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The main pacemaker of the heart is the ___________
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SA mode |
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The valve found between the atrium and ventricle on the _________ side of the heart has only twoleaflets (flaps). (right or left)
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Left |
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The _______ side of the human heart is a high-pressure system. (left or right)
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Left |
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Which of the following statements about arteries is ALWAYS true?
a.) Carry highly oxygenated blood b.) Carry blood away from the heart c.) Have larger lumen diameters than similar-sized veins d.) two of the above |
b.) Carry blood away from the heart |
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__________ generally causes relaxation of precapillary sphincters.
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High O2 |
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In most fish, blood ejected by the ventricle first goes to ___________ capillaries.
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Gill |
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In an electrocardiogram (EKG), the QRS peak represents ___________.
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Ventricular Depolarization |
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Atrial contraction occurs shortly ____________.
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After the P wave |
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A red blood cell exiting from lung capillaries encounters structures in the following order ___________.
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Pulmonary vein-> left atrium -> bicuspid valve |
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Relative to the blood in most small arterioles, the blood in the pulmonary trunk is _________oxygenated. (less/more)
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Less |
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Blood flow is slowest in the ____________.
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Capillaries |
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In a person who is hot, blood vessels in the skin are likely ___________.
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Dilated |
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The protein most directly involved in blood clotting is ____________.
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Fibrinogen |
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Blood pressure likely is lowest in the ____________
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Veins |
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Heart ventricles relax during:
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Diastole |
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An electrical impulse starting at the SA node passes through the conducting-system structures in thefollowing order _________.
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AV node -> Bundle of His -> Purkinje fibers |
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The fluid portion of blood that remains after centrifugation of whole blood to remove the cells is called___________.
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Plasma |
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One develops _______________ veins when valves in the veins become nonfunctional
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Varicose |
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The pacemaker of the human heart is the ___________________________ (full name).
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Sinoatrial Node |
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Ventricular depolarization is shown by the ____________________ on an EKG (ECG).
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QRS |
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A ___________________ has a two-chambered heart.
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Fish |
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The __________________ fibers conduct electrical impulses directly to the ventricular muscle.
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Purkinje |
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The large vessel that receives blood directly from the left ventricle is the ____________.
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Aorta |
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The pulmonary trunk receives blood directly from the ________________ (be specific).
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Right Ventrical |
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The right atrioventricular valve also is known as the ______________ valve.
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Tricuspid |
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_____________________ are “strings” composed largely of collagen that run from the papillarymuscles to valve leaflets.
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Chordae Tendineae |
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Systole is when the ________________ are contracting.
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Ventrical |
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The exchange of gases primarily occurs between the tissues and blood in the _______________ (vessels).
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Capillaries |
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How do muscle contraction and breathing augment venous return?
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Muscles contract, veins close/open, and breathing decreases pressure in the chest |
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In which vessels is blood velocity the lowest, and why is this beneficial?
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Capillaries: They give more time for gas exchange |
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Which ventricle in the heart is the low-pressure pump and which is the high-pressure pump, and why isblood pumped at different pressures?
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The low-pressure pump is the right ventrical for the lungs. The high-pressure pump is the left ventrical which pumps through the entire body |
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Name (in order) the structures conduct the electrical stimulus from the AV node to the muscle of the leftventricle?
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AV node, Bundle of His, left bundle branch, left ventricle |
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Identify (in order) the heart chambers and major vessels that blood would pass through in traveling fromthe inferior vena cava to the aorta.
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Right atrium, right ventrical, pulmonary trunk, pulmonary arteries, pulmonary veins, left atrium, left ventrical, aorta |
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A local build-up of CO2 in skeletal muscle causes precapillary sphincters in skeletal muscle to relax.Why is this relaxation beneficial?
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Suggest your exercising, need more O2, relax of sphincters, opening ________, increase of O2 |
