Cardiac System

Question 1

Arteries

Answer 1

, arterioles, capillaries; considered resistance vessels and affect afterload. Vasodilation causes a decrease in afterload, whereas vasoconstriction causes an increase in afterload.

Question 2

Veins

Answer 2

Veins, Venules, and capillaries; considered capacitance vessels and regulate preload.

Question 3

Cardiac conduction

Answer 3

The SA node fires a stimulus across the walls of both the right and left atria causing them to contract; the stimulus arrives at the AV node; the stimulus is directed to follow the AV bundle (Bundle of His); the stimulus now travels through the apex of the heart through the bundle branches; the Purkinje fibers distribute the stimulus across both ventricles causing ventricular contraction.

Question 4

Pulse Pressure

Answer 4

Systolic - Diastolic

Question 5

Cardiac Output

Answer 5

QT = VO2/ C(a-v)O2x 10dL/L

Question 6

CaO2

Answer 6

CaO2 = (HGb x 1.34 x SaO2) + (PaO2 x 0.003)