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?