NASM Chapter 3: The Cardiorespiratory System

Which of the following is part of the cardiovascular system?

• Bronchi

• Blood

• Lungs

Which of the following refers to the space in the chest between the lungs that contains all the internal organs of the chest except the lungs?

• Mediastinum

• Interstitium

• Peritoneum

Identify a true statement about cardiac muscle.

• Cardiac muscle fibers are more tightly connected than skeletal muscle fibers.

• Cardiac muscle fibers are longer than skeletal muscle fibers.

• It is a voluntary muscle.

Identify a true statement about skeletal muscle.

• Skeletal muscle fibers are more tightly connected than cardiac muscle fibers.

• Skeletal muscle fibers are shorter than cardiac muscle fibers.

• It is a voluntary muscle.

Which of the following is the function of intercalated discs?

• They help hold muscle cells together during the contraction of the heart.

• They help regulate body temperature, fight infections, and remove waste products.

• They help remove heat from internal to external regions of the body.

A specialized area of cardiac tissue, located in the right atrium of the heart, which initiates the electrical impulses that determine the heart rate is called the _____.

• fossa ovalis

• sinoatrial (SA) node

• atrioventricular (AV) node

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

• Sinoatrial node

• Pectoral node

• Atrioventricular node

A small mass of specialized cardiac muscle fibers, located in the wall of the right atrium of the heart, which receives heartbeat impulses from the sinoatrial node and directs them to the walls of the ventricles is called the _____.

• sentinel node

• atrioventricular node

• aortic arch

In the electrical conduction system of the heart, which of the following delays the impulse before allowing it to move on to the ventricles?

• Sinoatrial node

• Pectoral node

• Atrioventricular node

Why is the right side of the heart referred to as the pulmonic side?

• It receives deoxygenated blood from the body and pumps it to the lungs and then back to the left atria.

• It initiates electrical signals causing the heart to beat.

• It receives blood high in oxygen and low in carbon dioxide (oxygenated) from the lungs and pumps it to the rest of the body.