BIO 141 - CHAPTER 10 TEST QUESTIONS WITH
ACCURATE SOLUTIONS
What part of the sarcomere remains unchanged during contraction? -- Answer ✔✔ A
band
Deep inward extensions of the sarcolemma form a tunnel-like network inside the
muscle known as: -- Answer ✔✔ t-tubules (transverse tubules)
A group of skeletal muscle fibers together with the surrounding perimysium form a(n): -
- Answer ✔✔ fascicle
What wraps and surrounds an individual skeletal muscle fiber? -- Answer ✔✔
endomysium
What anchors thin and thick filaments in place within the myofibril? -- Answer ✔✔ Z
disc
The central region of the A band that lacks thin filaments is the: -- Answer ✔✔ H zone
,What is the functional contractile unit of the myofibril? -- Answer ✔✔ sarcomere
A long, rope-like regulatory protein that twists around actin, covering actin's active sites:
-- Answer ✔✔ tropomyosin
Small globular regulatory protein that holds tropomyosin in place; assists with turning
contractions on and off: -- Answer ✔✔ troponin
What part of the myofibril shortens to produce contractions of the muscle fiber? --
Answer ✔✔ sarcomere
The perimysium and epimysium come together at the end of the muscle to form a: --
Answer ✔✔ tendon
What thick layer of connective tissue anchors skeletal muscle to their surrounding
tissues and holds groups of muscles together? -- Answer ✔✔ fascia
Light bands in a sarcomere represent: -- Answer ✔✔ thin filaments
Dark bands in a sarcomere represent: -- Answer ✔✔ thick and thin filaments
What region of the sarcomere is called the zone of overlap? -- Answer ✔✔ A band
, If the Na+ voltage-gated channels in a muscle cell open, what is the result? -- Answer
✔✔ depolarization
During what stage of a muscle action potential does voltage-gated potassium ion
channels open and potassium ions leave the cell? -- Answer ✔✔ repolarization
A muscle cell experiencing resting membrane potential is: -- Answer ✔✔ polarized
Where should most of the potassium ions be located when a muscle cell is at rest? --
Answer ✔✔ cytosol
The Na+/K+ pump helps a muscle cell maintain a state of: -- Answer ✔✔ resting
membrane potential
The opening of voltage-gated sodium ion channels and sodium ions enter the cell
promotes the: -- Answer ✔✔ depolarization stage
What value best represents resting membrane potential of skeletal muscle cells? --
Answer ✔✔ -85 mV
Electrical gradients exist because sodium and potassium ions are separated on either
side of the plasma membrane.
True or False -- Answer ✔✔ True
ACCURATE SOLUTIONS
What part of the sarcomere remains unchanged during contraction? -- Answer ✔✔ A
band
Deep inward extensions of the sarcolemma form a tunnel-like network inside the
muscle known as: -- Answer ✔✔ t-tubules (transverse tubules)
A group of skeletal muscle fibers together with the surrounding perimysium form a(n): -
- Answer ✔✔ fascicle
What wraps and surrounds an individual skeletal muscle fiber? -- Answer ✔✔
endomysium
What anchors thin and thick filaments in place within the myofibril? -- Answer ✔✔ Z
disc
The central region of the A band that lacks thin filaments is the: -- Answer ✔✔ H zone
,What is the functional contractile unit of the myofibril? -- Answer ✔✔ sarcomere
A long, rope-like regulatory protein that twists around actin, covering actin's active sites:
-- Answer ✔✔ tropomyosin
Small globular regulatory protein that holds tropomyosin in place; assists with turning
contractions on and off: -- Answer ✔✔ troponin
What part of the myofibril shortens to produce contractions of the muscle fiber? --
Answer ✔✔ sarcomere
The perimysium and epimysium come together at the end of the muscle to form a: --
Answer ✔✔ tendon
What thick layer of connective tissue anchors skeletal muscle to their surrounding
tissues and holds groups of muscles together? -- Answer ✔✔ fascia
Light bands in a sarcomere represent: -- Answer ✔✔ thin filaments
Dark bands in a sarcomere represent: -- Answer ✔✔ thick and thin filaments
What region of the sarcomere is called the zone of overlap? -- Answer ✔✔ A band
, If the Na+ voltage-gated channels in a muscle cell open, what is the result? -- Answer
✔✔ depolarization
During what stage of a muscle action potential does voltage-gated potassium ion
channels open and potassium ions leave the cell? -- Answer ✔✔ repolarization
A muscle cell experiencing resting membrane potential is: -- Answer ✔✔ polarized
Where should most of the potassium ions be located when a muscle cell is at rest? --
Answer ✔✔ cytosol
The Na+/K+ pump helps a muscle cell maintain a state of: -- Answer ✔✔ resting
membrane potential
The opening of voltage-gated sodium ion channels and sodium ions enter the cell
promotes the: -- Answer ✔✔ depolarization stage
What value best represents resting membrane potential of skeletal muscle cells? --
Answer ✔✔ -85 mV
Electrical gradients exist because sodium and potassium ions are separated on either
side of the plasma membrane.
True or False -- Answer ✔✔ True
