Match each term with its corresponding definition or description.
-the ability of a muscle to stretch
A)Actin
B)Sarcolemma
C)Contractility
D)Tropomyosin
E)Extensibility
F)Myosin
G)T-tubule
H)Irritability
I)Sarcomere
J)Troponin
K)Motor unit

Question

Quizplus · Accepted Answer

Extensibility refers to the ability of a muscle to stretch.

Answer: A
 Actin is a protein that makes up the thin filaments in muscle cells.

Answer: C
 Contractility refers to the ability of a muscle to contract or shorten.

Answer: D
 Tropomyosin is a protein that covers the active sites on actin molecules, preventing myosin from binding to them.

Answer: F
 Myosin is a protein that makes up the thick filaments in muscle cells.

Answer: G
 T-tubules are invaginations of the sarcolemma that allow for the transmission of action potentials deep into the muscle fiber.

Answer: H
 Irritability (also known as responsiveness) refers to the ability of a muscle to respond to a stimulus.

Answer: I
 A sarcomere is the basic contractile unit of a muscle.

Answer: J
 Troponin is a protein complex that plays a key role in regulating muscle contraction.

Answer: K
 A motor unit consists of a motor neuron and all the muscle fibers it innervates.

Match Each Term with Its Corresponding Definition or Description