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Set 3 8 Smooth Muscle

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Question 1

(Multiple Choice)

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Sm oo th m us cle ce lls

A) Lack striations
B) Are sm aller than sk eletal musc le fibers
C) Have o ne nucleus instead of m any as in skeletal mu scle fibers
D) R es po nd to a va rie ty of sig na ls
E) All of the above

Answer

Question 2

(Multiple Choice)

Free
The proteins that release Ca2+ from the SR into the cytosol of sm ooth m uscle are

A) RyR
B) SERCa2a
C) IP3R
D) NCX
E) Both A and C are correct

Answer

Question 3

(Multiple Choice)

Free
The fun ction o f M LC K in s m ooth m usc le cells is to

A) Ph os ph or ylate ac tin
B) Ph os ph oryla te th e reg ulat ory lig ht c ha in o f m yos in
C) D ep ho sp ho ryla te tr op om yos in
D) Ph os ph or ylate tro po m yos in
E) Regulate the Ca2+ sensitivity of TnC

Answer