Heart Physiology

Which of the following is referred to the pacemaker of the heart?

• Sinoatrial (SA) node

• Atrioventricular (AV) node

• Atrioventricular (AV) bundle

• Purkinje fibers

Which part of the intrinsic conduction system connects the atria to the ventricles, and when damaged can cause various degrees of heart block?

• atrioventricular (AV) node

• bundles of His

• Purkinje fibers

• sinoatrial (SA) node

When blood is traveling away from the heart, in which of the following would you find it?

• arteries

• capillaries

• venules

• veins

When blood is traveling toward the heart, in which of the following would you find it?

• arteries

• capillaries

• arterioles

• veins

What is the function of valves in the heart?

• promote contraction of ventricles

• prevent backflow of blood through the heart

• eliminate pressure variances within the heart

• allow oxygen to diffuse into the heart

During atrial contraction and ventricular filling,

• the AV valves are open
• the semilunar valves are open
• the ventricles are contracted
• the atria are relaxed

Why are the walls of the left ventricle thicker than that of the right ventricle?

• The left ventricle must force blood into all the capillaries of the lungs 
• the left ventricle doesn't skip leg day
• This is false, the walls of the right ventricle are thicker
• Blood from the left ventricle is pumped throught the entire body 

Where in the heart could I find the SA Node?

• Right Atrium
• Left Atrium
• Right Ventricle
• Left Ventricle

When blood pressure is taken, the number on the top is the pressure during systole. This correlates with which of the following?

• ventricular contraction

• ventricular relaxation

• atrial contraction

• atrial relaxation

Tags

NGSS.HS-LS1-3

Which of the following correlate with the sounds of the cardiac cycle heard with a stethoscope?

• atrial contraction

• the opening of valves

• the closing of valves

• electrical impulse conduction