Key Terms: Heart and Thorax

Question 1

Thinner portion of the right interatrial septum

Answer 1

Fossa ovalis

Question 2

Superior margin of the manubrium sterni; lies opposite the lower border of the body of the second thoracic vertebrae

Answer 2

Suprasternal notch

Question 3

Lower boundary of the thorax, formed by the cartilages of the seventh through tenth ribs and the ends of the eleventh and twelfth cartilages

Answer 3

Costal margin

Question 4

Vertical line from the midpoint of the clavicle

Answer 4

Midclavicular line

Question 5

Lowest point of the sternum

Answer 5

Xiphoid

Question 6

Enter the right atrium from above and returns unoxygenated blood

Answer 6

Superior vena cava

Question 7

Separates the right ventricle from the left ventricle

Answer 7

Interventricular septum

Question 8

Located in the lower portion of the right interatrial septum which directs the electrical pulse toward the ventricles

Answer 8

atrioventricular node

Question 9

Angle between the manubrium and the body of the sternum; also known as the angle of louis

Answer 9

Sternal angle

Question 10

Two upper chambers of the heart

Answer 10

Atria

Question 11

Two lower chambers of the heart

Answer 11

Ventricles

Question 12

Junction between the xiphoid and the sternum

Answer 12

Xiphisternal joint

Question 13

Muscular contraction of the heart

Answer 13

Systole

Question 14

Small bands that spread the electrical impulse across the ventricles

Answer 14

Purkinje fibers

Question 15

Portion of the vena cava located in the abdomen

Answer 15

Inferior vena cava

Question 16

Method of recording the electrical activity generated by the heart muscle

Answer 16

Electrocardiography

Question 17

Describes the electrical activity that triggers contraction of the heart muscle

Answer 17

Depolarization

Question 18

Ring of dense tissues that attach the mitral and tricuspid valves

Answer 18

Annulus fibrosus

Question 19

Lies in the median plane over the sternum

Answer 19

midsternal line

Question 20

Valves located between the atria and ventricle

Answer 20

Atrioventricular valves

Question 21

Describes electrical activity just before the relaxation phase of cardiac muscle activity

Answer 21

Repolarization

Question 22

Remnant from fetal development on the edge of the IVC

Answer 22

Eustachian valve

Question 23

Sac surrounding the heart, reflecting off the great arteries

Answer 23

Pericardium

Question 24

Short ligament that connects the main pulmonary artery and the aorta

Answer 24

Ligamentum ateriosum

Question 25

Bands of muscle lining the anterior chamber of the right ventricle

Answer 25

Trabeculae carneae

Question 26

Muscular relaxation of the heart

Answer 26

Diastole

Question 27

Projections of muscle from the ventricular walls

Answer 27

Papillary muscles

Question 28

Runs vertically from a point midway between the anterior and posterior axillary folds

Answer 28

Midaxillary line

Question 29

Valves located in the aorta or pulmonic artery

Answer 29

Semilunar valves

Question 30

Outer layer of the heart wall

Answer 30

Epicardium

Question 31

Multiple thin fibers extending from the free edges of the mitral and tricuspid valves

Answer 31

Chordae tendinae

Question 32

Has three leaflets and is located between the left ventricle and aortic root

Answer 32

Aortic valve

Question 33

Valve with 3 cusps located between the right ventricle and main pulmonary artery

Answer 33

Pulmonic valve

Question 34

Valve located between the right atrium and right ventricle

Answer 34

Tricuspid valve

Question 35

Considered the initial pacemaker of the heart

Answer 35

Sinoatrial node

Question 36

Inner bands of muscle lining the right ventricle

Answer 36

Moderator band

Question 37

Inner layer of the heart wall

Answer 37

Endocardium

Question 38

Muscle that tightly lines the appendage

Answer 38

Pectinate muscle

Question 39

Thick, contractile middle layer of the heart

Answer 39

Myocardium

Question 40

Remnant form fetal development causing prominent edges on the coronary sinus

Answer 40

Thesbian valve

Question 41

Located between the IVC, and the opening of the right ventricle

Answer 41

Coronary sinus

Question 42

Small triangular extension from the upper portion of both atria

Answer 42

Appendage

Question 43

Bifurcates into right and left branches and helps carry electrical pulse to ventricles

Answer 43

Bundle of HIS