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28 Cards in this Set

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Vascular Supply for Heart:
the aorta gives rise to the ___ ___ ___ that branches into the ___ ____ ____ and ____ _____
left coronary artery
anterior interventricular artery
circumflex artery
supplies the anterior and left regions of the heart (artery)
left coronary artery
Vascular Supply for Heart:
aorta also gives rise to ___ ___ ___ that branches into ____ _____ ____ and ____ _____
right coronary artery
posterior interventricular artery
marginal artery
supplies the posterior and right regions of the heart
right coronary artery
Vascular Supply for Heart:
blood returns to the ___ ___ via the ____ ____ which receives blood from the ___ ___ ____ and ____ ____ ____
right atrium
coronary sinus
great cardiac vein
middle cardiac vein
Internal Heart Anatomy:
what lies between the atria and ventricles?
-right valve?
-left valve?
atrioventricular (AV) valves
tricuspid
bicuspid
AV valves ___ to allow bloowd to flow from atria to ventricles and _____ when ventricles contract
open
close
AV valves free edges attach to (connective tissue) and (finger-like projections of cardiac muscle in the ventricles)
chordae tendineae

papillary muscles
Papillary muscles ____ when ventricles ____ and ____ valves from ______
contract, contract

prevent, prolapsing
papillary muscles are extensions of ____ ____ (bumpy ridges of cardiac muscle in the _____)
trabeculae carneae

ventricles
the internal walls of the ____ also contain bumpy ridges of muscle called ___ ___
atria

pectinate muscles
"half-moon" valves each has three cusps
semilunar valves
between right ventricle and pulmonary trunk
pulmonic valve
between left ventricle and aorta
aortic valve
Semilunar valves ____ when the ventricles contract and ____ when the ventricles relax
open

close
semilunar valves close to prevent backflow of blood from the ___ ___ or ____ into the _____
pulmonary trunk or aorta into the ventricles
Fibrous Skeleton:
-_____ ____ for the valves and cardiac muscle cells
-____ ____ the ventricular muscle cells from the atrial muscle cells
attachment sites

electrically insulate
a system of specialized cardiac muscle cells
conducting system
conducting system generates ___ ____ at regular intervals
action potentials
cells that contract to PUMP the blood OUT of the heart
contractile cells
Components of Conducting System:
-____ ___
-____ ___
-conducting cells
SA node (sinoatrial)

AV node (atrioventricular)
conducting cells carry action potential through chanbers in the ventricles:
-___ ____ __ ____
-____ _____
AV bundle of His

Purkinje fibers
Impulse Conduction in Heart:
cells in SA nodes are called the ____ ___
-depolarize ____
-depolarize ____ than cells in AV node
-_____ action potential
-located at the ___ of the heart
pacemaker cells
spontaneously
faster
initiate
base
Impulse Conduction of Heart (2 and 3):
stimulus spreads to the __ ___.
meanwhile, the ___ contract and blood flows from the atria to the _____
AV node
atria
ventricles
Impulse Conduction (4):
stimulus then travels from the __ ___ through the fibrous skeleton via the __ ___ __ ___ to the ___ of the heart
AV node
AV bundle of His
apex
Impulse Conduction (5/6):
at the heart's apex the stimulus is carried to the ___ ____.
the ____ now contract beginnning at the ____
blood flows from left ventricle to aorta to be distributed to the ____ and from the right ventricle to pulmonary trunk and on to the ____
purkinje fibers
ventricles
apex
body
lungs
Autonomic Regulation(1):
autonomic innervation influences the ___ of contraction by innervating the __ ___
- _____ stimulation: ____ heart rate
-_____ stimulation: ____ heart rate
rate
SA node
parasympathetic:reduces
sympathetic:increases
Autonomic Regulation(2):
autonomic innervation influences the ____ of contraction by directly innervating ___ ___ ___
-____ stimulation: affects ___ contraction only and ____ force of contraction
-____ stimulation: affects ___ and ____ contration and ____ force of contraction
force
cardiac muscle cells
parasympathetic:atrial, decreases
sympathetic:atrial and ventricular, increases