cardiac muscle structure and function Flashcards Preview

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Flashcards in cardiac muscle structure and function Deck (19)
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1

cardiac muslces are ___

striated

2

Cardiac muscle are not under ___ ____ control

direct neural

3

Ca2+ binds to ___ to regulate actomysosin interaction

troponin

4

Cardiac muscles are ___, ____, and ______ than skeletal muscles

shorter, narrower, richer in mitochondria

5

ATPase activity of myoscin is ___ in cardiac than skeletal

slower

6

Gap junctions allow for

low resistance pathway for electrical currents

7

Desmosomes provide

adhesion/assure force generated in one cell passes to other

8

Cardiac muscle cells connect with each other through _______

intercalated disc

9

Intercalated discs coincide with ____, which contains ___ and ____

z discs,
desmosomes and gap junction

10

myofiber = ?

small bundle of muscles

11

Myofibirils

end to end arrays of identical sarcomeres

12

Sarcomeres

contractile units

13

Thin filament

actin

14

Thick filament

myosin

15

Actin binds ___ and ___

tropomyosin; troponin

16

Myosin is composed of ___

2 heavy chain, 4 light chain

17

Troponin C is a ___shaped protein with __ Ca binding site

dumbell
one (skeletal has 2)

18

Troponin I - Unique N terminal extension of __ amino acid; PKA ___ for ___ responsiveness of heart

32
phosporylate
adrenergic

19

Mechanism behind length - tension relationship

extend overlap, change in sensitivity to myofilament to ca, increased Ca release