Heart

Question 1

what are the types of fibres in the hearts conduction system called?

Answer 1

autorhythmic fibres

Question 2

on an ECG what does the QRS complex represent

Answer 2

depolaroization of ventricles

Question 3

order if firing in conduction system

Answer 3

SA node
AV node
Av bundle of his
bundle branches
purkinje fibres

Question 4

what are the2 layers of the pericardium

Answer 4

fibrous
serous

Question 5

what is the heart muscle called

Answer 5

myocardium

Question 6

what is the function of the auricle

Answer 6

increase the capacity of the atria

Question 7

what 3 large veins drain into the right atrium

Answer 7

coronary sinus
inferior vena cava
superior vena cave

Question 8

where are pectinate muscles found

Answer 8

walls of atrium

Question 9

trabeculae carnea are what?

Answer 9

muscles inside ventricles helping convey electricity

Question 10

which valves connect right atrium to the right ventricle

Answer 10

tricuspid

Question 11

once blood has left the heart what is the first branch of the aorta

Answer 11

coronary arteries

Question 12

what is the mechanism for valves to open and close in the heart

Answer 12

pressure changes

Question 13

the 2 semilunar valves are

Answer 13

aortic and pulmonary

Question 14

what attaches AV valves to the wall of the heart

Answer 14

chrodae tendinae

Question 15

when papillary muscles are relaxed the chordae tendinae are also slack - is the valve open or closed

Answer 15

open

Question 16

pulmonary circulation is the blood flowing from which chamber to what chamber

Answer 16

right ventricle into pulmonary valve into pulmonary trunk into lungs

Question 17

branches of the coronary arteries

Answer 17

LEFT - anterior interventricular, circumflex = LAC

RIGHT = posterior interventricular, marginal branch = RPM

Question 18

Which veins drain into coronary sinus

MAGS

Answer 18

middle cardiac vein
anterior cardiac vein
great cardiac vein
small cardiac vein

Question 19

what starts action potential in myocardium in the heart

Answer 19

SA node (natural pacemaker)

Question 20

during depolarization in heart muscle fibre, the action potential stimulates

Answer 20

Na+ to open and Na+ to rush in

Question 21

diff types of muscle in body, which moves food and urine

Answer 21

smooth

Question 22

what’s unique to cardiac muscle tissue

Answer 22

desmosomes, intercalated discs, gap junctions

Question 23

where does cardiac muscle tissue get energy from

Answer 23

aerobic respiration

Question 24

during ventricular systole what are the ventricles in the atria doing

Answer 24

ventricles = contracting

atria = relaxing

Question 25

what cranial nerve slows down heart rate

Answer 25

vagus

Question 26

baroreceptors detect,where are they located

Answer 26

pressure and stretch - located in carotid and aortic arch

Question 27

chemicals that help regulate heart rate

Answer 27

epinephrine
norepinephrine