Vocab #7 Flashcards Preview

Medical Issues in Athletic Training > Vocab #7 > Flashcards

Flashcards in Vocab #7 Deck (49)
Loading flashcards...
1

AV node

specialized cardiocytes that relay the contractile stimulus from the SA node to the bundle of His, the bundle branches, and Purkinje fibers, and the ventricular myocardium
located at the boundary between the atria and ventricles

2

cardiac output

the rate of blood ejected by the left ventricle
usually about 5 liters/min.

3

coronary arteries

two arteries that branch from the aorta that supply the heart with blood

4

depolarization

a change in the transmembrane potential from a negative value toward 0 mV

5

diastle

relaxation of the left ventricle
used to measure the diastolic pressure when taking a BP

6

endocardium

innermost layer of the heart
comprised mostly of epithelial cells to create a smooth lining inside the chambers of the heart and created an ionic barrier between blood and cardiac tissue

7

erythropoietin

a hormone released by most tissues - especially the kidneys - when exposed to low oxygen concentrations
stimulates red blood cell formation in red bone marrow

8

mitral valve

the left atrioventricular (AV) valve
regulates blood flow between the left atrium and left ventricle

9

myocaridum

the cardiac muscle layer of the heart
contains short, branched, single-nucleated cells
between the endocaridum and epicaridum

10

myocardium

the cardiac muscle layer of the heart
contains short, branched, single-nucleated cells
between the endocardium and epicardium

11

palpitations

heart rhythm irregularities
most often they are not serious but they can be due to an abnormal heart rhythm

12

pericardium

the fibrous sac that surround the heart
surround, lubricates, and protects the heart and root of the great blood vessels
composed of the parietal pericaridum and visceral pericaridum

13

pulmonary circuit

blood vessels between the pulmonary semilumar valve of the right ventricle and the entrance to the left atrium
the blood flow through the lungs

14

pulmonary valve

allows blood to flow from the right ventricle into the pulmonary artery (then to the lungs for reoxygenation)
a SL valve

15

prukinje fibers

specialized conducting cardiocytes in the ventricles of the heart
receive signal to depolarize and stimulate both ventricles to contract

16

repolarization

the movement of the transmembrane potential away from a positive value and toward the resting potential

17

S1

first heart sound
results from the closure of the mitral and tricuspid valves
lower frequency sound than S2
occurs at the beginning of ventricular systole

18

S2

results from the closure of the aortic and pulmonic valves
sharper, sounder sound than S1
occurs at end of ventricular systole

19

S3

results from the impact of inflowing blood against a distended or incompliant ventricle in mid diastole
low-frequency sound occurring about 1/10 of a second after S2

20

S4

sound of the vibration of a non-compliant ventricle that is forced to accept blood during atrial systole
very closely approximated to the first heart sound
often producing, in tandem with the first heart sound, a stuttering quality

21

stroke volume

volume of blood pumped from one ventricle of the heart with each beat

22

systemic circuit

the vessels between the aortic valve and the entrance to the right atrium
the system other than the vessels of the pulmonary circuit
carries oxygenated blood away from the heart to the body and returns deoxygenated blood back to the heart

23

tricuspid valve

the right atrioventricular valve
prevents the backflow of blood into the right atrium diring ventricular systole
allows blood to enter the right ventricle from the right atrium

24

ventricle

a fluid-filled chamber
in the heart, one of the large chambers discharging blood into the pulmonary or systemic circuits

25

SA node

sinoatrial node
the natural pacemaker of the heart
situated in the wall of the right atrium

26

systole

a period of contraction in a chamber of the heart as part of the cardiac cycle
used to measure the systolic pressure when taking blood pressure

27

aberrant

deviating from the usual course, as certain ducts, vessels, or nerves

28

AED

automated external defibrillator
portable device that checks the heart rhythm and can send an electric shock to the heart to try and restore a normal rhythm

29

aueurysm

a sac filled with fluid or clotted blood that results from dilation of the wall and that can cause stenosis of the coronary artery

30

angiotensin-converting enzyme (ACE) inhibitors

a pharmaceutical drug used primarily for the treatment of hypertension and congestive heart failure
causes dilation of blood vessels, resulting in lower blood pressure