Cardiovascular system part 2

Question 1

SA node

Answer 1

sinoatrial node
pacemaker
sends signal to aria and AV node to allow blood to pass from atria to ventricles

Question 2

AV node

Answer 2

atrio-ventricular node

gives rise to AV bundle to purkinjie fibers for ventricular contraction

Question 3

transmission order of cardiac impulse

Answer 3

SA node
atria
AV node
AV bundle (bundle of his)
ventricles

Question 4

where is the CV control centre located

Answer 4

medulla

Question 5

what does the CV control centre do

Answer 5

regulates hearts output, distribution of blood, vasomotor tone

Question 6

what hormones are released by the sympathetic

Answer 6

catecholamine release of epinephrine and norepinephrine

Question 7

what hormone is released parasympathetic

Answer 7

acetylchonline

Question 8

the sympathetic nervous system increases?

Answer 8

heart rate
contractility
vasodilation of arterioles of skeletal muscle
vasoconstriction of visceral arterioles

Question 9

the parasympathetic nervous system decreases?

Answer 9

heart rate
contractility
vasodilation of arterioles of skeletal muscle
vasoconstriction of visceral arterioles

Question 10

ECG

Answer 10

electrocardiogram measures hearts electrical activity

Question 11

P wave

Answer 11

atrial depolarization

Question 12

QRS complex

Answer 12

ventricle depolarization (systole)

Question 13

T wave

Answer 13

ventricle depolarization (diastole)

Question 14

increasing end-diastolic volume of the heart will cause what?

Answer 14

stretching of the myocardium,
increases in strength of contraction,
increased volume of blood ejected during systole

Question 15

in diastole the aortic and pulmonary semilunar valves are?

Answer 15

closed

Question 16

which of the following will have the highest volume of blood?
a) SV
b) Afterload
C) LVESV
d) LVEDV

Answer 16

left ventricular end diastolic because the heart is completely full before contraction

Question 17

SV = ?

Answer 17

LVEDV - LVESV

Question 18

if blood accumulates in the veins (ventilation) and is not returned to he heart, what happens to LVEDV and SV

Answer 18

both increase

Question 19

if venoconstriction occurs what happens to LVEDV and SV

Answer 19

both volumes decrease

Question 20

the p wave and t wave of a standard ECG represent?

Answer 20

atrial depolarization and ventricular repolarization