Course

Anatomy & Physiology

Study Pack

Set 37 Animal Movement Muscles And Skeletons

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Question 1

(Multiple Choice)

Free
What is the function of tropomyosin in muscle cells?

A)Tropomyosin binds to actin molecules and brings about shortening of the muscles.
B)Tropomyosin covers the myosin binding sites on the actin filaments, preventing contraction from occurring.
C)Tropomyosin is the contractile unit of the muscle cell.
D)Tropomyosin stores calcium.

Answer

Question 2

(Multiple Choice)

Free
Cnidarians, such as _____, have muscle fibers.

A)clams
B)earthworms
C)jellyfish
D)sea corals

Answer

Question 3

(Multiple Choice)

Free
The cross-bridge power stroke corresponds to which event in muscle contraction?

A)myosin detachment from actin
B)sliding of actin with respect to myosin
C)cocking of the myosin head
D)binding of the myosin head to actin

Answer