Lecture 22: Heart Gross Anatomy Flashcards Preview

Bree - Structures > Lecture 22: Heart Gross Anatomy > Flashcards

Flashcards in Lecture 22: Heart Gross Anatomy Deck (27):
1

what is another term for anterior IV branch

LAD (left anterior descending)

2

what do cardiac veins accomplish

remove metabolic products from myocardium

3

what do coronary arteries do

supply myocardium with oxygen

4

what do arteries end in

arterioles then capillaries

5

what is the basis of collateral circulation

anastemoses

6

if an artery doesnt have an anastemosis what is it called

end artery

7

what happens with occlusion of an end artery

necrosis of the tissue being supplied

8

classic example of an end artery

central artery of the retina

9

what happens with coronary occlusion

myocardial infarction (necrosis) and heart attack

10

what happens with coronary insufficiency

myocardial ischemia and angina pectoris (cardiac/chest pain)

11

3 most common areas of cardiac occlusion

RCA, LAD, circumflex

12

what kind of gland is the heart

endocrine

13

what kind of cells is the myocardium composed of

cardiac muscle cells (myocytes or cardiocytes), contractile cells, myoendocrine cells (atrial myocytes), conducting cells

14

conducting cells of the heart

nodal cells, bundle branches, purjinke fibers

15

how do cardiac muscle fibers in myocardium run

opposite directions, spirally around atria and ventricles

16

complex spiral arrangements of ventricles explanation on a cellular level

Cardiac myocytes are separated by perimysium into
bundles/fascicles of various sizes with different
orientations

17

how does ventricle contract (physical description)

like wringing of a towel

18

length of cardiac myocytes

long lived

19

what do cardiac myocytes accumulate in old age

lipofuscin pigment (yellow/brown, wear and tear)

20

can cardiac myocytes regenerate

no

21

describe the ECM of the heart

1) basal lamina form weave surrounding cardiocytes
2) elastic fiber bundles wrap around cardiocytes
3) collagen fibrils insert onto basal lamina
4) collagen fiber bundles form collage struts between neighboring cardiocytes

22

atrial vs ventricular myocytes

smaller in size
fewer transverse tubules
have granules

23

why is heart an endocrine organ

atrial myocytes synthesizes atrial natriuretic peptide (ANP) and store it in granules

24

when is ANP released

in response to stretch of atrial wall - secreted by exocytosis into blood circulation

25

what does ANP do

blocks sodium reabsorption in renal tubules thereby promoting sodium and urine excretion

26

what is the atrioventricular bundle called and composed of

bundle of his
L and R ventricular bundle

27

where are purjinke fibers

sub endocardium