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a&p ii > Heart > Flashcards

Heart Flashcards

1
Q

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

A

autorhythmic fibres

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2
Q

on an ECG what does the QRS complex represent

A

depolaroization of ventricles

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3
Q

order if firing in conduction system

A

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

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4
Q

what are the2 layers of the pericardium

A

fibrous
serous

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5
Q

what is the heart muscle called

A

myocardium

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6
Q

what is the function of the auricle

A

increase the capacity of the atria

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7
Q

what 3 large veins drain into the right atrium

A

coronary sinus
inferior vena cava
superior vena cave

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8
Q

where are pectinate muscles found

A

walls of atrium

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9
Q

trabeculae carnea are what?

A

muscles inside ventricles helping convey electricity

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10
Q

which valves connect right atrium to the right ventricle

A

tricuspid

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11
Q

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

A

coronary arteries

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12
Q

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

A

pressure changes

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13
Q

the 2 semilunar valves are

A

aortic and pulmonary

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14
Q

what attaches AV valves to the wall of the heart

A

chrodae tendinae

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15
Q

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

A

open

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16
Q

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

A

right ventricle into pulmonary valve into pulmonary trunk into lungs

17
Q

branches of the coronary arteries

A

LEFT - anterior interventricular, circumflex = LAC

RIGHT = posterior interventricular, marginal branch = RPM

18
Q

Which veins drain into coronary sinus

MAGS

A

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

19
Q

what starts action potential in myocardium in the heart

A

SA node (natural pacemaker)

20
Q

during depolarization in heart muscle fibre, the action potential stimulates

A

Na+ to open and Na+ to rush in

21
Q

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

A

smooth

22
Q

what’s unique to cardiac muscle tissue

A

desmosomes, intercalated discs, gap junctions

23
Q

where does cardiac muscle tissue get energy from

A

aerobic respiration

24
Q

during ventricular systole what are the ventricles in the atria doing

A

ventricles = contracting

atria = relaxing

25
Q

what cranial nerve slows down heart rate

A

vagus

26
Q

baroreceptors detect,where are they located

A

pressure and stretch - located in carotid and aortic arch

27
Q

chemicals that help regulate heart rate

A

epinephrine
norepinephrine

a&p ii (10 decks)

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