What do the anatomical differences between the ventricles of the heart reflect?

The blood type of the individual

Which ventricle of the heart has a relatively thin wall?

Both ventricles have equally thick walls

Neither ventricle has a thin wall

What is the function of the valves in the heart?

To permit blood flow in only one direction

To permit blood flow in multiple directions

To decrease the oxygen content in the blood

What does the cardiac skeleton support in the heart?

The contractile cells and valves

What is the function of coronary circulation?

It meets the high oxygen demands of cardiac muscle cells.

It supplies blood to the brain.

It provides nutrients to the liver.

Where do the coronary arteries originate?

At the base of the pulmonary artery.

At the tip of the left ventricle.

What do the great and middle cardiac veins do?

They carry blood from the coronary capillaries to the coronary sinus.

They carry oxygenated blood to the heart.

They transport hormones to the heart.

Which coronary artery is known as the "widowmaker"?

Left anterior descending coronary artery.

Posterior descending coronary artery.

Which two general classes of cardiac cells are involved in the normal heartbeat?

Contractile cells and cells of the conduction system

Contractile cells and neural cells

Endothelial cells and contractile cells

Cells of the conduction system and epithelial cells

Why do cardiac muscle cells produce isolated contractions (twitches) rather than tetanic contractions?

Because they have a long refractory period

Because they have a short refractory period

Because they lack a conduction system

Because they are stimulated slowly

What does the conduction system of the heart include?

Nodal cells and conducting cells

Nodal cells and pacemaker cells

Conducting cells and muscle cells

Pacemaker cells and muscle cells

What is the role of the conduction system in the heart?

It initiates and distributes electrical impulses within the heart.

It pumps blood throughout the body.

It filters the blood before it is pumped.

It provides oxygen to the heart muscle.

What is the function of nodal cells in the heart?

They establish the rate of cardiac contraction.

They contract the heart muscle.

What are pacemaker cells?

Nodal cells that reach threshold first

Cells that filter blood in the heart

Nodal cells that reach threshold last

Conducting cells that distribute blood

What is the role of conducting cells in the heart's conduction system?

They distribute the contractile stimulus to the general myocardium.

They establish the rate of cardiac contraction.

They generate the force for blood circulation.

They filter impurities from the blood.

What is the function of the Sinoatrial (SA) node in the heart?

It acts as the pacemaker of the heart.

It pumps blood into the ventricles.

It collects oxygenated blood from the lungs.

Which structure in the heart's conduction system is responsible for delaying the impulse before it passes to the ventricles?

Right and left AV bundle branches

Where are the Purkinje fibers located in the heart's conduction system?

In the interatrial bundle and fibers

What is the correct sequence of impulse conduction in the heart, starting from the pacemaker?

SA node → AV node → AV bundle → Purkinje fibers

AV node → SA node → AV bundle → Purkinje fibers

AV bundle → SA node → AV node → Purkinje fibers

Purkinje fibers → AV bundle → SA node → AV node

What does a cardiac cycle consist of?

Systole (contraction) followed by diastole (relaxation)

Diastole (relaxation) followed by systole (contraction)

Do the ventricles contract at different times during the cardiac cycle?

No, they contract at the same time

Yes, they contract at different times

The ventricles do not contract at all

What causes the characteristic heart sounds?

The closing of the heart valves and the rushing of blood through the heart

The beating of the heart muscle

The flow of blood in the arteries

The expansion and contraction of the lungs

What does heart dynamics refer to?

The movements and forces generated during heart contractions

The electrical activity of the heart

The process of blood purification in the heart

The structural components of the heart

What does the atrial reflex do to the heart rate when blood stretches the walls of the right atrium?

Has no effect on the heart rate

According to the Frank-Starling principle, what happens when the ventricular walls are stretched?

Ventricular contractions become more powerful and increase stroke volume

Ventricular contractions become less powerful

Ventricular contractions become more powerful and decrease stroke volume

Ventricular contractions stop completely

What effect does norepinephrine (NE) have when released by sympathetic neurons?

Increases heart rate and stroke volume

Decreases heart rate and stroke volume

Has no effect on heart rate and stroke volume

Decreases heart rate but increases stroke volume

Which hormones are released by the suprarenal medullae and increase heart rate and stroke volume?

Epinephrine (E) and norepinephrine (NE)

Acetylcholine (ACh) and norepinephrine (NE)

Aside from epinephrine and norepinephrine, which other substances increase cardiac output?

Acetylcholine (ACh) and insulin

What is the function of the cardioacceleratory center in the medulla oblongata?

It activates sympathetic neurons

It deactivates sympathetic neurons

It activates parasympathetic neurons

It monitors blood pressure and dissolved gases

What does the cardioinhibitory center govern?

The activities of the parasympathetic neurons

The activities of the sympathetic neurons

The activities of the cardioacceleratory center

The monitoring of blood pressure and dissolved gases

Where do the cardiac centers receive inputs from?

Higher centers and receptors monitoring blood pressure and the levels of dissolved gases

Only from receptors monitoring blood pressure

Only from receptors monitoring the levels of dissolved gases

Only from the cardioacceleratory and cardioinhibitory centers

A&P Chapter 12 - The Cardiovascular System: Heart

Authored by Ephram Bailey

Science

11th Grade

NGSS covered

Used 1+ times

A&P Chapter 12 - The Cardiovascular System: Heart

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the function of the pulmonary circuit in the cardiovascular system?

It transports blood to and from the kidneys.

It carries blood to and from the lungs.

It circulates blood within the heart itself.

It delivers blood to the brain and back.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What do arteries do in the cardiovascular system?

They return blood to the heart.

They carry blood away from the heart.

They connect the smallest arteries and veins.

They transport blood to and from the lungs.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the role of capillaries in the cardiovascular system?

They return blood to the heart.

They carry blood away from the heart.

They are tiny vessels between the smallest arteries and smallest veins.

They transport blood to and from the lungs.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which vessels are responsible for returning blood to the heart?

Arteries

Capillaries

Veins

Pulmonary vessels

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the heart surrounded by?

Pleural cavity

Pericardial cavity

Abdominal cavity

Cranial cavity

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the visceral pericardium also known as?

Myocardium

Endocardium

Epicardium

Pericardium

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the parietal pericardium line?

The heart's outer surface

The inner surface of the pericardial sac

The inner surface of the heart chambers

The outer surface of the pericardial sac

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A&P Chapter 12 - The Cardiovascular System: Heart

What is the function of the pulmonary circuit in the cardiovascular system?

What do arteries do in the cardiovascular system?

What is the role of capillaries in the cardiovascular system?

Which vessels are responsible for returning blood to the heart?

What is the heart surrounded by?

What is the visceral pericardium also known as?

What does the parietal pericardium line?

What is the bulk of the heart composed of?

What lines the inner surfaces of the heart?

What are cardiac muscle cells interconnected by?

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