Chapter 8 Smooth Muscle Flashcards Preview

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Flashcards in Chapter 8 Smooth Muscle Deck (15):
1

How multi unit and unitary smooth muscles respond

Multi- independently

Unitary- in unison with gap junction

2

Skeletal muscle

Myosin and actin
Striations
Speed contraction
Transverse tubules
Source of Ca
Ca binding
Contraction control
Spontaneous electrical activity

Yes
Yes
Fast or slow
Yes
SR
Troponin
Tropomyosin
No

3

Skeletal muscle

Gap junctions
Electrical coupling
Effect of nerve stim
Extent of innervation
Hormone effect

No
No
Excitatory
Each cell
Some

4

Cardiac muscle

Myosin and actin
Striations
Speed of contraction
T tubules
Ca source
Ca binding
Contraction control

Yes
Yes
Slow
Yes
SR and ECF
Troponin
Tropomyosin

5

Cardiac muscle

Spont electrical activity
Gap junctions
Electrical coupling
Effect of nerve stim
Extent innervation
Hormone effect

Yes
Many
Some
Excitatory or inhibitory
Variable
Large

6

Multi unit smooth muscle

Myosin and actin
Striations
Contraction speed
T tubules
Ca source
Ca binding
Contraction control

Yes
No
Very slow
No
SR and ECF
Calmodulin
Myosin

7

Multi unit smooth muscle

Spont electrical activity
Gap junctions
Electrical coupling
Effect of nerve stim
Extent innervation
Effect hormones

No
Few
Some
Excitatory or inhibitory
Dense
Large

8

Unitary smooth muscle

Myosin and actin
Striations
Contraction speed
T tubules
Ca source
Ca binding
Contraction control

Yes
No
Very slow
No
SR and ECF
Calmodulin
Myosin

9

Unitary smooth muscle

Spont electrical activity
Gap junctions
Electrical coupling
Effect of nerve stim
Extent innervation
Effect hormones

Yes
Many
Yes
Excitatory or inhibitory
Sparse
Large

10

Skeletal muscle cell

Shape
Nuclei
Sarcomere
T tubules
Regeneration
Mitosis

Long cyndrilical
Multiple, peripherally
Yes, striated
Yes, triad w SR
Yes w satellite cells
No

11

Skeletal muscle physiology

ECF ca required
Cross bridge formation
Contraction control
Summation of twitches increased w freq
Tension varies w filament overlap

No (from SR)
Ca binding to troponin
Motor neurons
Yes
Yes

12

Cardiac muscle physiology

ECF ca required
Cross bridge formation
Contraction control
Summation of twitches increased w freq
Tension varies w filament overlap

Yes
Ca bind to troponin
Autonomic nerves w b adrenergic agonists
No
Yes

13

Smooth muscle physiology

ECF ca required
Cross bridge formation
Contraction control
Summation of twitches increased w freq
Tension varies w filament overlap

Yes
Ca calmodulin activ of myosin kinase and phosphorylation of myosin
Autonomic nerves and hormones
Yes
Yes

14

Cardiac muscle cell structure

Shape
Nuclei
Sarcomeres
T tubule
Electrical coupling
Regeneration
Mitosis

Branched
One, sometimes 2. Located centrally
Yes, striated
Yes, dyad with SR
Yes, intercalated discs and gap junctions
No
No

15

Smooth muscle structure

Shape
Nuclei
Sarcomeres
T tubule
Electrical coupling
Regeneration
Mitosis

Spindle of fusiform
One located centrally
Sarcomeres
No, caveole
Yes, gap junctions
Yes
Yes