Lab Quiz III

Question 1

Einthoven’s Triangle Leads

Answer 1

I - RA-LA, II - RA-LL, III-LA-LL

Question 2

P-R Interval

Answer 2

time of onset of atrial depolarization to onset of ventricular depolarization

Question 3

Q-T Interval

Answer 3

Time of onset of ventricular depolarization to end of ventricular depolarization. Represents ventricular refractory period

Question 4

P-R Segment

Answer 4

Time of conduction through AV node, plateau phase of atrial muscle action potential. (end of atrial depolarization to start of ventricular depolarization)

Question 5

S-T Segment

Answer 5

Time when ventricles are fully depolarized. Plateau phase of ventricular action potential (End of QRS to start of T)

Question 6

Left Shift

Answer 6

Fat

Question 7

Right Shift

Answer 7

Skinny

Question 8

MABP equation

Answer 8

MABP = DP + (1/3)*(SP-DP)

Question 9

Receptors: N-Ach

Answer 9

in all autonomic ganglia, and will send postganglionic excitation to the cells connected

Question 10

Receptors: B1 adrenergic

Answer 10

in cardiac muscle, will increase contractile strength, at SA node, will increase heart rate

Question 11

Receptors: M-Ach

Answer 11

Located at the SA node to decrease heart rate.

Question 12

Receptors: A1 adrenergic

Answer 12

Located at arterioles and veins, causes vasoconstriction

Question 13

Receptors: B2 adrenergic

Answer 13

Located at arterioles, causes vasodilation

Question 14

Receptors: Guanylyl Cyclase

Answer 14

Located at arterioles, causes vasodilation

Question 15

At rest, what systems are active, inactive, and partially active?

Answer 15

CA inactive, CI max, and VM partially active

Question 16

MABP Equation II

Answer 16

MABP = CO x TPR, where CO = HR x SV