Chapter 1 - Anatomy

Question 1

In terms of the “anterior view,” which portion of the heart is dominant?

Answer 1

right ventricle

Question 2

Name of the left atrioventricular (AV) valve.

Answer 2

Mitral (“bicuspid”) valve (Think “mitraL” = Left AV valve)

Question 3

In terms of the “electrical view,” which portion of the heart is dominant?

Answer 3

left ventricle (larger mass)

Question 4

Name of the right atrioventricular (AV) valve.

Answer 4

tricuspid valve

Question 5

This specialized portion of the heart’s conduction system inervates the entirety of both ventricles, just below the endocardium.

Answer 5

Purkinje fibers

Question 6

Location of the SA node.

Answer 6

WITHIN the muscle of the right atrium

Question 7

Average BPM of the SA node

Answer 7

70 BPM

Question 8

Intrinsic rate of SA node

Answer 8

60 - 100 BPM

Question 9

Intrinsic rate of atrial myocytes

Answer 9

55-60 BPM

Question 10

Intrinsic rate of AV node

Answer 10

45-50 BPM

Question 11

Intrinsic rate of His bundle

Answer 11

40-45 BPM

Question 12

Intrinsic rate of bundle branches

Answer 12

40-45 BPM

Question 13

Intrinsic rate of Purkinje fibers

Answer 13

35-40 BPM

Question 14

Intrinsic rate of ventricular myocytes

Answer 14

30-35 BPM

Question 15

Location of the AV node

Answer 15

junction of coronary sinus/septal leaflet of the tricuspid

Question 16

Conduction point between SA node and let atrium.

Answer 16

Bachmann bundle

Question 17

Right bundle branch terminates in the ______.

Answer 17

purkinje system of the right ventricle

Question 18

Name the two portions of the terminal region of the left bundle branch.

Answer 18

left anterior fascicle left posterior fascicle

Question 19

Innervates the antero-superior portion of the left ventricle.

Answer 19

left anterior fascicle

Question 20

Innervates the posteroinferior region of the left ventricle.

Answer 20

left posterior fascicle* *this is a WIDELY distributed fascicle, so it is very difficult to block

Question 21

Sketch the cardiac conduction system and intrinsic rates.

Answer 21