Match each of the terms with its definition or explanation.
-Muscle contraction in which the muscle tenses but does not shorten
A)Skeletal muscle
B)Smooth muscle
C)Origin
D)Insertion
E)Actin
F)Myosin
G)Motor unit
H)Neuromuscular junction
I)Isotonic
J)Isometric

Question

Quizplus · Accepted Answer

Isometric muscle contraction is where the muscle tenses but does not change in length, which matches the definition given.

Answer: A
 Skeletal muscle is the type of muscle that is most commonly associated with voluntary movement in the body, and is under conscious control.

Answer: D
 The insertion of a muscle is the point at which it attaches to the bone that it moves, while the origin is the point at which the muscle attaches to a stationary bone.

Answer: F
 Myosin is a protein found in muscle cells that is responsible for generating force during muscle contraction, by interacting with actin filaments.

Answer: E
 Actin is a protein found in muscle cells that is responsible for providing the structure and support necessary for muscle contraction, and interacts with myosin to generate force.

Answer: G
 A motor unit is a group of muscle fibers that are all controlled by the same motor neuron, and work together to produce movement in the body.

Answer: H
 The neuromuscular junction is the point at which a motor neuron connects with the muscle fibers it controls, and allows nerve impulses to trigger muscle contraction.

Answer: I
 Isotonic muscle contraction is where the muscle shortens, while maintaining a constant level of tension, such as lifting a weight or doing a bicep curl.

Match Each of the Terms with Its Definition or Explanation