Practice quiz questions- Heart
Terms in this set (53)
Blood flow through Heart
1. Venae cavae
2. Right atrium
3. Right ventricle
4. Pulmonary trunk
5. Pulmonary arteries
6. Pulmonary veins
Action potential path
1. Sinoatrial (SA) node
2. Internodal pathways
3. Atrioventricular (AV) node
4. AV bundle
5. Left and right bundle branches
6. Purkinje fibers
Steps of cardiac cycle, beginning with resting period between heartbearts
1. Atrial Systole
2. Atrial Diastole
3. Ventricular Systole First Phase
4. Ventricular systole second phase
5. Ventricular diastole early
6. Ventricular diastole late
depolarization of the atria
transmission of the impulse to contract from the SA node to the AV node and through the ventricles
time required for the ventricles to undergo a single cycle of depolarization and repolarization
repolarization of ventricles
Vessels that carry blood away from the heart are called __________.
When the heart beats, the __________ contract first
The left atrium collects blood from the __________ and empties into the left ventricle.
When blood is ejected from the heart, it is pushed from the __________ to the __________.
The heart has __________ chambers and __________ valves.
The epicardium of the heart is the same as the __________.
anterior interventricular sulcus and the posterior interventricular sulcus
On the outside of the heart, the boundaries between the right and left ventricles are marked by the
The expandable outer portion of each atrium is called __________.
The right atrium receives blood from the __________.
The AV valves prevent the backflow of blood into the __________, and the semilunar valves prevent backflow of blood into the __________.
tricuspid valve; bicuspid valve
The right and left AV valves are also called the __________ and __________, respectively.
The free edges of the AV valves are attached to fibers called __________.
The left atrium receives blood from the __________.
The innermost layer of the heart is called the __________.
Deoxygenated blood leaves the right ventricle through a semilunar valve and enters the __________
has a thicker wall
Compared to the right ventricle, the left ventricle __________.
Heart apex is superior***
Which of the following statements concerning the heart is FALSE?
In contrast to skeletal muscle, cardiac muscle cells have a __________ phase as part of their action potential.
the cells that depolarize and reach threshold first
The SA node acts as the pacemaker of the heart because these cells are __________
The refractory period of cardiac muscles is __________ than that of skeletal muscles.
If undisturbed, the cells of the AV node will depolarize about __________ times per second.
Without external interactions, the cells of the SA node depolarize __________ times per minute.
conduct impulses rapidly
The Purkinje fibers __________.
The bundle branches __________
The QRS complex represents __________
The P wave represents __________.
The T wave represents __________.
Which of the following correctly describes conducting cells of the SA node?
The contractile cells of the myocardium reach threshold because of an influx of __________.
Which of the following statements concerning contractile cells and the heartbeat is INCORRECT?
The plateau phase of the contractile cell's action potential is the result of calcium ions moving out of the cell.
atria contract before the ventricles begin to contract
The conduction delay that occurs at the AV node allows __________.
Which wave, interval, or complex represents the depolarization of the ventricles?
During ventricular filling, the AV valves are __________, and the semilunar valves are __________.
Contraction of the chambers of the heart is called __________, and relaxation of the chambers of the heart is called __________.
relaxed and filling
When atrial contraction begins, the ventricles are __________.
AV valves close
The first heart sound, "lubb," marks the point when __________.
How many heart sounds
The stroke volume of the heart is approximately __________.
the amount of blood ejected from each ventricle during ventricular systole
both HR × SV and HR × (EDV − ESV)
In a normal resting adult, the effects of the __________ division of the autonomic nervous system dominate.
SV x HR
The cardiac output (CO) is equal to __________
What is the term for an abnormally slow heart rate?
Calcium entry into the cardiac muscle cell creates a __________ in the action potential that lasts about 175 msec.
When __________ is released from autonomic neurons at the heart, the repolarization period is shortened and nodal cells reach threshold more quickly