A&P2 Test 3

Place the following parts of the cardiac conduction system in the order in which they transmit the action potential. 1) atrioventricular (AV) bundle 2) Purkinje fibers 3) sinoatrial (SA) node 4) right and left bundle branches 5) contractile cells of cardiac muscle tissue 6) atrioventricular (AV) node A. 3, 6, 1, 4, 2, 5 B. 3, 1, 6, 4, 2, 5 C. 3, 6, 4, 1, 2, 5 D. 3, 1, 6, 4, 5, 2

A. 3, 6, 1, 4, 2, 5

Where should the left ventricle send blood? A. aorta B. left atrium C. coronary sinus D. pulmonary trunk

A. Aorta

Predict the position of the valves when the ventricles contract. A. Both AV valves are forced shut while both semilunar valves are forced open. B. Both AV valves and semilunar valves are forced shut. C. Both AV valves are forced open while both semilunar valves are forced shut. D. Both AV valves and semilunar valves are forced open.

A. Both AV valves are forced shut while both semilunar valves are forced open.

High-pressured blood in the ventricles __________. A. forces the semilunar valves open B. forces the AV valves open C. forces both the AV valves and semilunar valves shut D. forces both the AV valves and semilunar valves open

A. Forces the semilunar valves open

The cardiac chamber with the thickest wall is the __________. A. left ventricle B. right ventricle C. right atrium D. left atrium

A. Left venricle (Because it has to generate the most pressure)

What muscles, present in the ventricles, anchor by tendon-like chords called chordae tendineae? A. papillary muscles B. ligamentum arteriosum C. trabeculae carneae D. pectinate muscles

A. Papillary muscles

What vessel(s) deliver oxygenated blood to the left atrium? A. Pulmonary veins B. Pulmonary trunk C. Pulmonary arteries D. Aorta

A. Pulmonary veins

What valve prevents the backflow of blood from the right ventricle into the right atrium? A. right atrioventricular valve (tricuspid valve) B. aortic valve C. left atrioventricular valve (mitral or bicuspid valve) D. pulmonary valve

A. Right atrioventricular valve (tricuspid valve)

What produces the "lub dub" heart sounds? A. the vibrations of the ventricular and blood vessel walls when valves shut B. the relaxation of the atria, and then the ventricles C. the contraction of the atria, and then the ventricles D. the sound of blood traveling through the heart

A. The vibrations of the ventricular and blood vessel walls when valves shut

Blood in the right atrium should travel next past the __________. A. tricuspid valve and into the right ventricle B. mitral valve and into the left ventricle C. pulmonary trunk to the pulmonary capillaries D. pulmonary valve and into the pulmonary trunk

A. Tricuspid valve and into the right ventricle

Which blood type vessels serve as the body reservoirs to maintain flow

Arteries

The blood vessels that carry blood away from the heart are called arteries. The ones that carry blood back to the heart are called veins.

Away arteries ,back veins

The P wave on an electrocardiogram (ECG) represents the depolarization of cells in the __________. A. atrioventricular (AV) node B. atria C. sinoatrial (SA) node D. ventricles

B. Atria

Generally, coronary veins empty into a vessel known as the: A. superior vena cava. B. coronary sinus. C. aorta. D. inferior vena cava.

B. Coronary sinus.

Blood returning from the lungs enters the __________. A. left ventricle B. left atrium C. right ventricle D. right atrium

B. Left atrium (Oxygenated blood returning from the lungs via the pulmonary veins enters the left atrium.)

During what part of the action potential will calcium ions enter the contractile cell? A. Rapid depolarization phase B. Plateau phase C. Initial repolarization phase D. Repolarization phase

B. Plateau phase

Which of the following does NOT return blood to the right atrium of the heart? A. inferior vena cava B. pulmonary vein C. superior vena cava D. coronary sinus

B. Pulmonary vein

Which of the following vessels carries oxygenated blood? A. superior vena cava B. pulmonary vein C. pulmonary trunk D. pulmonary artery

B. Pulmonary vein

On an electrocardiogram (ECG), atrial repolarization is obscured by the: A. P wave. B. QRS wave. C. S-T segment. D. T wave.

B. QRS wave.

The right and left atria depolarize and contract following the arrival of the action potential from the: A. atrioventricular (AV) node. B. sinoatrial (SA) node. C. atrioventricular (AV) bundle. D. Purkinje fibers.

B. Sinoatrial (SA) node.

Blood from the systemic circuit returns to the heart via the __________. A. pulmonary veins B. vena cavae C. cardiac veins D. pulmonary arteries

B. Vena cavae (The two veins that drain the majority of the systemic circuit are the superior and inferior venae cavae.)

The chambers that have just emptied when the second heart sound is heard are the __________. A. coronary sinuses B. ventricles C. atria D. atria and ventricles

B. Ventricles

The right and left coronary arteries receive blood from the: A. coronary sinus. B. superior vena cava. C. aorta. D. pulmonary trunk.

C. Aorta

Which vessel is guarded by a semilunar valve at its base? A. pulmonary vein B. coronary sinus C. pulmonary trunk D. superior vena cava

C. Pulmonary trunk

Which wave on the electrocardiogram (ECG) represents ventricular depolarization? A. R-R interval B. P wave C. QRS wave D. T wave

C. QRS wave

Both the left and right atria receive blood from: A. the lungs. B. arteries. C. veins. D. the ventricles.

C. Veins

Which vessel supplies the systemic circuit with oxygenated blood? A. coronary sinus B. superior vena cava C. pulmonary trunk D. aorta

D. Aorta

The right side of the heart receives: A. oxygenated blood from the systemic circuit. B. deoxygenated blood from the pulmonary circuit. C. oxygenated blood from the pulmonary circuit. D. deoxygenated blood from the systemic circuit.

D. Deoxygenated blood from the systemic circuit.

What characteristic differentiates cardiac muscle cells from skeletal muscle cells? A. striations B. excitability C. sarcoplasmic reticulum D. intercalated discs

D. Intercalated discs

The AV valves close when __________. A. pressure in the ventricles decreases B. pressure in the aorta increases C. pressure in the atria increases D. pressure in the ventricles increases

D. Pressure in the ventricles increases.

What is the function of the valves in the heart? A. invert during contraction of the ventricles B. eliminate pressure variances within the heart C. promote contraction of the ventricles D. prevent backflow of blood through the heart

D. Prevent backflow of blood through the heart

Blood that leaves the right ventricle enters the __________. A. vena cavae B. aorta C. pulmonary veins D. pulmonary trunk

D. Pulmonary trunk

The main pacemaker of the heart is the __________. A. AV node B. Purkinje fiber system C. sympathetic nervous system D. SA node

D. SA node

Blood in the right atrium should travel next past the: A. mitral valve and into the left ventricle. B. pulmonary valve and into the pulmonary trunk. C. pulmonary trunk to the pulmonary capillaries. D. tricuspid valve and into the right ventricle.

D. Tricuspid valve and into the right ventricle.

The T wave of an ECG corresponds to __________. A. ventricular depolarization B. atrial depolarization C. atrial repolarization D. ventricular repolarization

D. Ventricular repolarization (Ventricles are relaxing at this time)

calcium ion channels on the skeletal muscle cells membrane must close before the sale can repolarize

False

Which is NOT correctly matched?

P wave - represents atrial depolarization. b. T wave - represents ventricular repolarization. c. QRS complex - represents ventricular depolarization.

Beginning with the right atrium put the following structures in the sequence to order that a red blood cell would pass through the cardiovascular

RIGHT ATRIUM,vena cava, tri Val, right ventricle, OR RA (Right Atrium) => (TV) Tricuspid Valve => RV (Right Ventricle) => PV (Pulmonary Valve) => PA (Pulmonary Artery) => Lungs => PV (Pulmonary Veins- Right and Left) =

In the heart an action potential originates in the pacemaker cell known as

SA

the av valves are open during which phase of the cardiac cycle

The atrial systole is the last phase of a diastole during which the ventricular filling is completed. The atrioventricular valves are open; the semilunar valves are closed

what is the first heart sound heard during ventricular systole

The first heart sound, called S1, makes a "lub" sound caused by the closure of the mitral and tricuspid valves as ventricular systole begins.

The closure of a pre-capillary sphincter prevents blood flow to tissues from

arterioles

semilunar valves open during systole

semilunar valves open when the ventricular muscle contracts and generates blood pressure within the ventricl or atrioventricular valves remain open while the semilunar valves are closed.

Determine the impact if the connection between the sinoatrial (SA) node and the atrioventricular (AV) node becomes blocked.

the ventricles will beat more slowly