Chapter 8 Smooth Muscle Flashcards
1
Q
How multi unit and unitary smooth muscles respond
A
Multi- independently
Unitary- in unison with gap junction
2
Q
Skeletal muscle
Myosin and actin Striations Speed contraction Transverse tubules Source of Ca Ca binding Contraction control Spontaneous electrical activity
A
Yes Yes Fast or slow Yes SR Troponin Tropomyosin No
3
Q
Skeletal muscle
Gap junctions Electrical coupling Effect of nerve stim Extent of innervation Hormone effect
A
No No Excitatory Each cell Some
4
Q
Cardiac muscle
Myosin and actin Striations Speed of contraction T tubules Ca source Ca binding Contraction control
A
Yes Yes Slow Yes SR and ECF Troponin Tropomyosin
5
Q
Cardiac muscle
Spont electrical activity Gap junctions Electrical coupling Effect of nerve stim Extent innervation Hormone effect
A
Yes Many Some Excitatory or inhibitory Variable Large
6
Q
Multi unit smooth muscle
Myosin and actin Striations Contraction speed T tubules Ca source Ca binding Contraction control
A
Yes No Very slow No SR and ECF Calmodulin Myosin
7
Q
Multi unit smooth muscle
Spont electrical activity Gap junctions Electrical coupling Effect of nerve stim Extent innervation Effect hormones
A
No Few Some Excitatory or inhibitory Dense Large
8
Q
Unitary smooth muscle
Myosin and actin Striations Contraction speed T tubules Ca source Ca binding Contraction control
A
Yes No Very slow No SR and ECF Calmodulin Myosin
9
Q
Unitary smooth muscle
Spont electrical activity Gap junctions Electrical coupling Effect of nerve stim Extent innervation Effect hormones
A
Yes Many Yes Excitatory or inhibitory Sparse Large
10
Q
Skeletal muscle cell
Shape Nuclei Sarcomere T tubules Regeneration Mitosis
A
Long cyndrilical Multiple, peripherally Yes, striated Yes, triad w SR Yes w satellite cells No
11
Q
Skeletal muscle physiology
ECF ca required Cross bridge formation Contraction control Summation of twitches increased w freq Tension varies w filament overlap
A
No (from SR) Ca binding to troponin Motor neurons Yes Yes
12
Q
Cardiac muscle physiology
ECF ca required Cross bridge formation Contraction control Summation of twitches increased w freq Tension varies w filament overlap
A
Yes Ca bind to troponin Autonomic nerves w b adrenergic agonists No Yes
13
Q
Smooth muscle physiology
ECF ca required Cross bridge formation Contraction control Summation of twitches increased w freq Tension varies w filament overlap
A
Yes Ca calmodulin activ of myosin kinase and phosphorylation of myosin Autonomic nerves and hormones Yes Yes
14
Q
Cardiac muscle cell structure
Shape Nuclei Sarcomeres T tubule Electrical coupling Regeneration Mitosis
A
Branched One, sometimes 2. Located centrally Yes, striated Yes, dyad with SR Yes, intercalated discs and gap junctions No No
15
Q
Smooth muscle structure
Shape Nuclei Sarcomeres T tubule Electrical coupling Regeneration Mitosis
A
Spindle of fusiform One located centrally Sarcomeres No, caveole Yes, gap junctions Yes Yes
