In Class Questions Block 1

Question 1

What is the defining physical property that distinguishes the arterial from venous vasculature?

Answer 1

The venous system is highly compliant whereas the arterial system is highly elastic.

Question 2

One heart valve has two cusps what is it and where is it?

Answer 2

The Bicuspid valve and is located between the left atrium and left ventricle.

Question 3

What is the only acellular layer of the heart?

Answer 3

The epicardium which is the outermost layer of the heart.

Question 4

Which characteristics distinguish cardiac muscle from skeletal muscle?

Answer 4

Larger T tubles, Intercalated disks which allow for fibers to be smaller instead of running full length of the muscle.

Question 5

What are the 3 filament proteins found in the A band of cardiac myoctyes?

Answer 5

1. Full length Myosin
2. Titin
3. Alpha actin

Question 6

What currents are responsible for the plateau phase of the ventricular myocyte AP?

Answer 6

Ca2+ moving into the cell and K+ moving out at roughly the same rate and gives you a a plateau.

Question 7

A RR interval of greater than 2 sec is indicative of what arrhythmia?

Answer 7

Bradycardia

Question 8

A shorter Q-T interval tells you what about the ventricular myocyte AP?

Answer 8

It is in the Plateau Phase.