BSC 216 heart homework
tetany
As a result of the long refractory period in the contractile cell, cardiac muscle can NOT exhibit
Isovolumetric contraction phase
As ventricular systole begin, all four heart valves are closed during the:
Vena cava
Blood from the systemic circuit returns to the heart via the________
Right atrium
Blood in the right ventricle arrived from the:
Left atrium
Blood returning from the lungs enters the__________
Pulmonary trunk
Blood that leaves the right ventricle enters the__________
Veins
Both the left and right atria receive blood from:
Heart
Coronary circulation involves the delivery of oxygenated blood to the:
The ventricles will contract more slowly
Determine the impact if the connection between the SA node and the AV node becomes blocked
Ventricular ejection phase
During what phase does blood flow from the ventricles into the pulmonary trunk and aorta?
-Superior vena cava -Inferior vena cava -Coronary sinus
How does blood return to the right atrium
The duration of atrial depolarization and AV node delay
P wave
-SA node -AV node -AV bundle -Right and left bundle branches -Purkinje fibers -Contractile cells of cardiac muscle tissue
Place the following parts of the cardiac conduction system in the order in which they transmit the action potential
Atria
The P wave on an electrocardiogram represents the depolarization of cells in the:
Ventricular repolarization
The T wave of an ECG corresponds to__________
The pressure in the left ventricle falls below aortic pressure
The aortic valve closes when________
Left ventricle
The cardiac chamber with the thickest wall is the_________
Pacemaker cells
The cells that rhythmically and spontaneously generate action potentials in the heart are called_________
Delayed; before
The electrical impulse is___________ as it passes through the AV node, which permits the atria to contract__________ ventricles
Mediastinum
The heart is situated in the middle of the thoracic cavity in a region known as the:
SA node
The main pacemaker of the heart is the_________
Full depolarization phase
The rapid influx of calcium ions into pacemaker cells create a positive membrane potential inside the cell and is responsible for the:
SA node
The right and left atria depolarize and contract following the arrival of the action potential from the:
Aorta
The right and left coronary arteries receive blood from the:
The lungs
The right side of the heart pumps deoxygenated blood into__________
Right coronary artery
The right side of the heart receives blood supply from the______
Deoxygenated blood from the systemic circuit
The right side of the heart receives:
Systemic circuit
The vessels that deliver oxygen to the tissues of the body are part of the__________
True
True or False: The left side of the heart is often called the systemic pump due to blood flow to the body
True
True or False: The left ventricle has greater muscle mass than the right ventricle since it pumps against greater resistance
the ventricular cells are undergoing action potential
What activity is occurring in the heart during the Q-T interval on an electrocardiogram?
R-R interval
What can be used to measure heart rate?
Intercalated discs
What characteristics differentiate cardiac muscle cells from skeletal muscle cells?
Prevent back flow of blood through the heart?
What is the function of the valves in the heart?
Parietal pericardium
What is this?
Papillary muscles
What muscles, present in the ventricles, anchor the atrioventricular valves by tendon-like chords called chord tentineae?
tricuspid valve
What valves prevents the back flow of blood from the right ventricle into the right atrium?
Pulmonary vein
What vessel carries oxygenated blood?
Pulmonary veins
What vessel(s) deliver oxygenated blood to the left atrium?
Aorta
Where should the left ventricle send blood?
QRS wave
Which part of the electrocardiogram would most be affected by abnormally slow depolarization of the ventricles
Pulmonary trunk
Which vessel is guarded by a semilunar valve at its base?
Aorta
Which vessel supplies the systemic circuit with oxygenated blood?
QRS wave
Which wave on the electrocardiogram represents ventricular depolarization
Sinatrial (SA) node
what normally serves as the pacemaker of the entire heart?
