Ch 15 - Cardio!

The aorta is the largest artery in the pulmonary circuit

• True
• False

Arteries are strong, elastic vessels that carry blood to the heart.

• True
• False

Which of the following helps return blood to the heart?

• A) Positive intrathoracic pressure
• B) Valves in the arteries
• C) Contracting skeletal muscles
• D) Capillary action

Small areas of the myocardium contracting chaotically is called

• A) flutter.
• B) fibrillation.
• C) bradycardia.
• D) tachycardia.

The normal pacemaker of the heart is the

• A) Purkinje fibers.
• B) AV bundle.
• C) sinoatrial node.
• D) atrioventricular node.

An abnormally slow heart rate is termed

• A) tachycardia.
• B) bradycardia.
• C) fibrillation.
• D) cardioversion.

The correct sequence of parts that carry cardiac impulses is

• A) AV node, SA node, Purkinje fibers, AV bundle.
• B) AV node, AV bundle, Purkinje fibers, SA node.
• C) SA node, Purkinje fibers, AV node, AV bundle.
• D) SA node, AV node, AV bundle, Purkinje fibers.

When the ventricular walls contract,

• A) the mitral valve opens and the tricuspid valve closes.
• B) the tricuspid valve opens and the mitral valve closes.
• C) the mitral and tricuspid valves close.
• D) the mitral and tricuspid valves open.

Which of the following might serve as a secondary pacemaker for the heart?

• A) AV node
• B) Purkinje fibers
• C) Both AV node and Purkinje fibers
• D) Neither AV node nor Purkinje fibers

Which type of blood vessel holds the greatest volume of blood?

• A) Artery
• B) Arteriole
• C) Capillary
• D) Vein