Flashcards in Chapter 20: The Heart Deck (55)
the blood vessels in the cardiovascular system are subdivided into the...
pulmonary and systemic circuits
blood is carried away from the heart in...
the left atrium recieves blood from the pulmonary circuit and empties it into the...
the "double pump" function of the heart includes the right side, which serve as the ________ circuit pump, while the left side serves as the _______ pump.
the major difference between the left and right ventricles relative to their role in heart function is...
the LV pumps blood through the high-resistance systemic circulation
the great cardiac vein drains blood from the heart muscle to the...
the visceral pericardium, or epicardium, covers the...
outer surface of the heart
the valves of the heart are covered by the squamous epithelium, the...
the three distinct layers of the heart wall include the...
epicardium, myocardium, and endocardium
atrioventricular valves prevent backflow of blood into the_______; semilunar valves prevent backflow into the________.
blood flows from the left atrium into the left ventricle through the __________ valve.
2. L atrioventricular
when deoxygenated blood leaves the right ventricle through a semilunar valve, it is forced into the...
blood from systemic circulation is returned to the right atrium by the....
superior and inferior vena cava
oxygenated blood from the systemic arteries flows into...
peripheral tissue capillaries
the lung capillaries recieve deoxygenated blood from the....
one of the important differences between skeletal muscles tissue and cardiac muscle tissue is that cardiac muscle tissue is...
striated involuntary muscle
cardiac muscle tissue...
does not require nerve activity to stimulate a contraction
the primary difference that characterize cardiac muscle cells when comparing them to skeletal muscle fibers is...
2.a single, centrally located nucleus
3. the presence of intercalated discs
blood from coronary circulation is returned to the right atrium of the heart via...
the coronary sinus
the right coronary artery supplies blood to...
1. the right atrium
2. portions of the conducting system of the heart
3. portions of the right and left ventricles
the correct sequential path of a normal action potential in the heart is:
SA node->AV node->AV bundle->bundle braches->Purkinje fibers
if the papillary muscles fail to contract, the...
AV valves will not close properly
the sinoartrial nodes acts as the pacemaker of the heart because these cells are...
the ones that depolarize and reach threshold first
after the SA node is depolarized and the impulse spread through the atria, there is a slight delay before the impulse spreads to the ventricles. The importance of this delay is that it allows...
the atria to finish contracting
if each heart muscle cell contracted at its own individual rate, the condition would resemble...
the P wave of a normal electrocardiogram indicates...
the QRS complex of the ECG appears as the...
ECGs are useful in detecting and diagnosing abnormal patterns of cardiac activity called...
an excessively large QRS complex often indicates that the...
heart has become enlarged