UNL BIOS 214 ANATOMY EXAM 2 QUIZ QUESTIONS &
VERIFIED ANSWERS
Which of the following is considered to be the "functional unit" of skeletal muscle fibers?
- Answers - the sarcomere
A motor unit is - Answers - one neuronal axon and all the muscle fibers innervated by it
Slow oxidative (SO) fibers (slow-twitch fibers) have more _______ and less ________
than fast glycolytic (FG) fibers (fast-twitch fibers). - Answers - myoglobin, glycogen
Action potentials are propagated from the surface to the interior of a muscle fiber by
way of - Answers - the T tubules
Which of the following is an autoimmune disorder that leads to destruction of
acetylcholine receptors? - Answers - myasthenia gravis
What type of embryological cell gives rise to muscle fibers? - Answers - myoblasts
Each end of a sarcomere is marked by - Answers - a Z disc
Which of the following is not true of elastic filaments?
- They prevent overstretching of muscle fibers.
- They attach to Z discs.
- They are composed of titin.
- They keep thick and thin filaments aligned.
- They run through the core of thin filaments. - Answers - they run through the core of
thin filaments
What structure stores calcium ions that trigger contraction? - Answers - sarcoplasmic
reticulum
When a muscle joins a bone and has no visible tendon, it is said to have - Answers - a
direct attachment
Which of the following is voluntary muscle?
skeletal muscle
cardiac muscle
None of the choices are correct.
smooth muscle
All of the choices are correct. - Answers - skeletal muscle
Which is not a function of skeletal muscle?
VERIFIED ANSWERS
Which of the following is considered to be the "functional unit" of skeletal muscle fibers?
- Answers - the sarcomere
A motor unit is - Answers - one neuronal axon and all the muscle fibers innervated by it
Slow oxidative (SO) fibers (slow-twitch fibers) have more _______ and less ________
than fast glycolytic (FG) fibers (fast-twitch fibers). - Answers - myoglobin, glycogen
Action potentials are propagated from the surface to the interior of a muscle fiber by
way of - Answers - the T tubules
Which of the following is an autoimmune disorder that leads to destruction of
acetylcholine receptors? - Answers - myasthenia gravis
What type of embryological cell gives rise to muscle fibers? - Answers - myoblasts
Each end of a sarcomere is marked by - Answers - a Z disc
Which of the following is not true of elastic filaments?
- They prevent overstretching of muscle fibers.
- They attach to Z discs.
- They are composed of titin.
- They keep thick and thin filaments aligned.
- They run through the core of thin filaments. - Answers - they run through the core of
thin filaments
What structure stores calcium ions that trigger contraction? - Answers - sarcoplasmic
reticulum
When a muscle joins a bone and has no visible tendon, it is said to have - Answers - a
direct attachment
Which of the following is voluntary muscle?
skeletal muscle
cardiac muscle
None of the choices are correct.
smooth muscle
All of the choices are correct. - Answers - skeletal muscle
Which is not a function of skeletal muscle?
