Heart Symp And Parasymp

Question 1

SA node (pacemaker) sympathetic effect and receptor

Answer 1

Increase heart rate (positive Chronotropic effect) B1>B2

Question 2

SA node (pacemaker) parasympathetic effect and receptor

Answer 2

Decrease heart rate (negative Chrono tropic effect) M2»M3

Question 3

Atria sympathetic effect and receptor

Answer 3

Increase contractility ( positive inotropic effect) increase conduction velocity (positive dromotropic effect) B1>B2 (3:2 in the atria)

Question 4

Atria parasympathetic effect and receptor

Answer 4

Decrease contractility (negative inotropic effect) and shortened action potential duration M2»M3

Question 5

AV node sympathetic effect and receptor

Answer 5

Increase automaticity and conduction velocity B1>B2

Question 6

AV node parasympathetic effect and receptor

Answer 6

Decreased conduction velocity (negative Dromotropic effect) and potential for AV block M2»M3

Question 7

His-Purkinje system sympathetic effect and receptor

Answer 7

Increase automaticity and conduction velocity B1>B2

Question 8

His-Purkinje system parasympathetic effect and receptor

Answer 8

Little effect M2»M3

Question 9

Ventricles sympathetic effect and receptor

Answer 9

Increase contractility conduction velocity and automaticity B1>B2 (4:1 in ventricles)

Question 10

Ventricles parasympathetic effect and receptors

Answer 10

Slight decrease in contractility M2»M3

Question 11

Chronotropic (+ or-)

Answer 11

Effect on HR

Question 12

Inotropic + or-

Answer 12

Effect on contractility

Question 13

Dromotropic +or-

Answer 13

Effect on conduction