Which type of muscle is primarily responsible for regulating the diameter of tubes in the body?
Anatomy - Mechanisms of Smooth Muscle Contraction

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Science, Biology, Chemistry, Health Sciences
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Skeletal muscle
Cardiac muscle
Striated muscle
Smooth muscle
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the first method by which smooth muscle contraction can be induced?
Voltage-gated sodium channels
Chemical signals
Electrical impulses
Stretch channels
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which hormone is involved in the second method of smooth muscle activation?
Insulin
Thyroxine
Epinephrine
Glucagon
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the role of cyclic AMP in smooth muscle contraction?
It binds directly to actin
It triggers calcium release from the sarcoplasmic reticulum
It inhibits myosin light chain kinase
It deactivates calmodulin
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In smooth muscle, what does calcium bind to in order to activate contraction?
Troponin
Calmodulin
Actin
Myosin
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What enzyme is activated by the calcium-calmodulin complex in smooth muscle?
Myosin light chain kinase
Adenylate cyclase
Phospholipase C
Protein kinase A
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How is myosin activated in smooth muscle to form cross-bridges with actin?
Via ATP hydrolysis
By direct calcium binding
Through phosphorylation
By binding to troponin
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