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Lecture 20
Exam 2
33
Physiology
Undergraduate 2
06/10/2010

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Cards

Term
What are small cells linked by in the smooth muscle structure?
Definition
desmosomes
Term
Do smooth muscle have striations?
Definition
no
Term
in the smooth muscle what is not present when actin and tropomyosin is present?
Definition
troponin
Term
What is smooth muscle equivalent to in the dense bodies (how many lines)?
Definition
2 lines
Term
What is anchored to cell membrane?
Definition
Dense bodies
Term
What is attached at the dense bodies and it pull ends of cell?
Definition
thin filaments
Term
What is force with no stimulus?
Definition
tone
Term
Tone only applies to what kind of muscle?
Definition
smooth muscle
Term
What leaks in an partially activates the smooth muscle in the tone?
Definition
Calcium
Term
What leaks in an partially activates the smooth muscle in the tone?
Definition
Calcium
Term
What is very important in the tone that needs maintenance?
Definition
BP (blood pressure i guess)
Term
What activates smooth muscle contraction?
Definition
Calcium
Term
where are most calcium sources?
Definition
through channels across cell membranes
Term
where are some calcium sources?
Definition
small SR, released by IP3
Term
What is activated in Myosin light chain kinase?
Definition
Calcium
Term
What is added to myosin light chain kinase?
Definition
phosphate
Term
What is activated for shortening and force?
Definition
Myosin ATPase
Term
What twists to generate force?
Definition
myosin
Term
When force generation is happening what does the filaments do to reduce force?
Definition
slide
Term
What does MLCPase removes from myosin light chains?
Definition
phosphate
Term
When myosin is turned off and the calcium level is low, what happens?
Definition
relaxation
Term
In latching when the removal of ______ when AM attached decreases M detachment rate?
Definition
Pi
Term
Latch maintain force with how much energy use?
Definition
little
Term
Smooth muscle types vary with function what do they do?
Definition
either emptying cavities or maintain force
Term
If one visceral Single unit contracts what happens?
Definition
All contracts
Term
What must happens before the cavity empties in the Visceral single unit?
Definition
it must shorten
Term
What release Ach, cause contraction?
Definition
Parasympathetic
Term
What release NE causes relaxation?
Definition
Sympathetic
Term
What has each cell individually active, No APSs or gap junctions?
Definition
Multi-Unit
Term
Force can go which way (up and/or down) from tone level?
Definition
up or down
Term
In neural effects what is sympathetic?
Definition
receptor dependent
Term
In neural effects what does alpha do?
Definition
open calcium channels and increase contraction
Term
In neural effects what does beta 2 do?
Definition
increase calcium pump activity, decrease contraction
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