Quiz: Structure of Cardiac and Smooth Muscle

1. Which of the following muscles consists of intercalated discs?
a. cardiac
b. skeletal
c. smooth
2. In what way are cardiac muscles and skeletal muscles similar?
a. both are highly branched
b. both have striations
c. both operate via autorhythmic activity
3. Which of the following statements is true regarding the structure of smooth muscle?
a. They have an overlapping pattern of actin and myosin, similar to skeletal muscle.
b. They consist of an irregular arrangement of actin and myosin.
c. They do not consist of actin or myosin.
4. Which of the following statements describe the function of smooth muscles?
a. They contract relatively fast and in a controlled manner.
b. They contract relatively slowly in a controlled manner.
c. They contract relatively slowly and in an uncontrolled manner.

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