Green - Smooth Muscle

Question 1

Calcium binding protein that activates MLCK

Answer 1

Calmodulin

Question 2

IP3

Answer 2

Formed from PIP2 by Phopholipase C

Signaling molecule in smooth muscle contraction and relaxation

Question 3

Found in tonic smooth muscle contractions where long-term tension is generated under conditions of low calcium and ATP concentrations

Answer 3

Latch State

Question 4

In multi-unit smooth muscle, the cells are not connected _____

Answer 4

Electrically

Question 5

Contractile fibers not arranged in sarcomeres

Contraction alters dimensions of organs

Contractions last much longer than in skeletal muscle

Answer 5

Smooth muscle

Question 6

Actin thin filaments in smooth muscle cells contain tropomyosin but no ?:

Answer 6

Troponin

Question 7

Myosin isoform is different in smooth muscle than that in skeletal muscle in that it has ?

Answer 7

Slower ATPase activity

Question 8

Sustained smooth muscle contraction requires what ?

Answer 8

Extracellular calcium

Question 9

Calcium enters the cell and binds to calmodulin. The calmodulin then activates _______ which phosphorylates regulatory light chains of myosin

Answer 9

Myosin light chain kinase

Question 10

Smooth muscle contraction is _____- regulated

Answer 10

Thick filament

(Skeletal muscle is thin filament regulated_

Question 11

Phasic contractions

Answer 11

Contracts rhythmically or intermittently

Question 12

Tonic contractions

Answer 12

Contracts continuously