Match each description to its correct term.
-this protein repeatedly binds,moves,and releases an adjacent thin filament causing a muscle to contract
A)Z line
B)ATP
C)mitochondria
D)actin
E)sarcomeres
F)phosphate group
G)myofibrils
H)smooth muscle
I)thick filaments
J)myosin
K)Sphincter

Question

Quizplus · Accepted Answer

The protein that repeatedly binds, moves, and releases an adjacent thin filament causing a muscle to contract is myosin.

Answer: D
 Actin is a thin filament that myosin interacts with to cause muscle contraction.

Answer: I
 Thick filaments are composed of myosin, which interacts with actin to cause muscle contraction.

Answer: E
 Sarcomeres are the basic contractile units of a muscle fiber and are composed of thick and thin filaments.

Answer: K
 A sphincter is a ring-like muscle that contracts to close off a passage or opening in the body, such as the anal sphincter or the pyloric sphincter. None of the other choices are applicable to this description.

Match Each Description to Its Correct Term