The Heart

Front 1

The heart is enclosed within an area of the thorax known as

Back 1

Mediastinum

Front 2

The double sac membrane that cover the heart is the

Back 2

Pericardium

Front 3

The heart has three layers of tissue; the middle and thickest layer is called

Back 3

Myocardium

Front 4

The layer of the heart tissue lining the heart chambers and covering valve tissue is the

Back 4

endocardium

Front 5

The heart chambers are seperated longitudinally by a body of tissue known as the

Back 5

cardiac septum

Front 6

The blood recieving chamber of the heart are the

Back 6

atria

Front 7

The flat, wrinkled appendage of the atruim, which increases its capacity is the

Back 7

auricle

Front 8

The vena cava enter the right atrium along with a third vein known as

Back 8

Coronary Sinus

Front 9

The pumping chamber of the heart are the

Back 9

ventricles

Front 10

Blood returns to the heart from the lungs by means of the

Back 10

Pulmonary Veins

Front 11

The large artery carrying blood to the body from the left ventricle of the heart is the

Back 11

aorta

Front 12

Those blood vessels that carry blood away from the heart are

Back 12

arteries

Front 13

Those blood vessels that carry blood toward the heart are

Back 13

veins

Front 14

On the right side of the heart, the valve between the right atrium and right ventricle

Back 14

tricuspid valve

Front 15

On the left side of the heart, the bicuspid valve has two flaps and is also known as the

Back 15

mitrial valve

Front 16

The valves leading toward the pulmonary trunk and aorta are referred to as the

Back 16

semilunar valves

Front 17

Arteries suppling blood to the tissue of the heart are the

Back 17

coronary arteries

Front 18

Cardiac muscle cells are connected to one another by junctions called

Back 18

intercalculated discs

Front 19

The 1st heart sound of the heart means the

Back 19

closure of AV valves (shuts)--and ventricular contraction (systole)

Front 20

The 2nd sound of the heart means

Back 20

The closing of the Semilunar Valves and relaxation (diastole)

Front 21

This device records the electreical activities associated with the contraction and relaxation of the heart, measured by placement of electrodes on the body surface

Back 21

Electrocardiogram (EKG)

Front 22

Atrial Depolarization; signals atrial systole

Back 22

P wave (EKG)

Front 23

Ventricular depolarization ; signals onset of the ventricular systole

Back 23

QRS wave (EKG)

Front 24

Ventricular repolarization ; precedes ventricular diastole

Back 24

T wave (EKG)

Front 25

Heart contractions are known by the alternate term

Back 25

systole

Front 26

relaxation periods of the heart when contractions are not occuring is

Back 26

diastole

Front 27

The smallest vessels, which carry bood toward to the cells of the tissues are the

Back 27

capillaries

Front 28

The semilunar valves prevent blood from flowing backwards into

Back 28

The ventricles

Front 29

Most of the cardic muscles of the heart is found in

Back 29

myocardium

Front 30

cardic muscle has specialized cells known as

Back 30

nodal cells

Front 31

transmits action potentials to the top of interventricular septum

Back 31

bundle fo HIS

Front 32

conducts action potential to ventricular muscle cells ; stimulates contraction of cardiac muscle cells as a unit

Back 32

Purkinje Fibers; AKA bundle of HIS

Front 33

supplied by VAGUS nerve;
releases ACETYCHOLINE
Inhibitory effect on the heart;
decreases heart rate
decreases force of contraction

Back 33

Parasympathetic stimulation

Front 34

Supplied by cardic nerves;
Releases Norepinephrine
stimulatory effect on heart;
increases heart rate;
increases force of contraction

Back 34

Sympathetic division