WorksheetsCWU Muscle Physiology Quiz
Total questions: 20
Worksheet time: 10mins
The _________________ is the functional unit of skeletal muscle because it is the smallest portion of the skeletal muscle capable of ________________.
muscle fiber, receiving a stimulus
muscle fiber, contracting
sarcomere, contracting
sarcomere, receiving a stimulus
myofibril, contracting
The actin myofilaments are anchored into the cytoskeleton of the cell by the _______________.
Z disks
A band
M line
I band
H zone
Connective tissue that surrounds the fasciculi is called________________.
perimysium
endomysium
fascia
fasciculi
epimysium
The ________________ is attached to bones via tendons.
myofilament
myofibril
muscle fiber
muscle fasciculus
whole skeletal muscle
A ___________________ is a single muscle cell.
myofilament
myofibril
muscle fasciculus
whole skeletal muscle
muscle fiber
The specific molecules that provide calcium binding sites on actin are ______________ molecules.
troponin
tropomyosin
titin
myosin
sodium
The ______________ consists of only actin myofilaments.
A band
I band
H zone
M line
Z disk
The __________________is the smooth ER of a muscle fiber and stores calcium ions.
sarcolemma
sarcoplasmic reticulum
sarcomere
sarcoplasm
T tubules
Aerobic respiration:
requires oxygen
breaks down glucose
produces ATP, CO2, and H2O
takes place in mitochondria located within the muscle fiber
All of these are true of aerobic respiration
ATP:
attaches to the myosin myofilaments
provides energy for the movement of the cross bridges
is required for muscle relaxation
releases part of its energy as heat
Has all of these characteristics
Creatine Phosphate:
is produced by the process of anaerobic respiration.
can replace ATP in binding myosin molecules during contraction.
acts as an energy reserve in muscle tissue.
is only formed during strenuous exercise.
All of these are correct.
The condition in which a muscle remains contracted between stimuli without relaxing is called
recruitment.
tetanus.
the all-or-none response.
a motor unit.
the lag phase.
A single motor neuron and all the skeletal muscles fibers it innervates is called a
neruomuscular junction
synaptic cleft
motor unit
synapse
presynaptic terminal
Excitiability is the ability of skeletal muscle to
shorten with force.
lengthen passively.
respond to a stimulus.
recoil to their original resting length.
be stretched.
Which of the following motor units would allow for greater, more precise, muscular control?
A motor unit made up of a motor neuron and 5 muscle fibers.
A motor unit made up of a motor neuron and 10 muscle fibers.
A motor unit made up of a motor neuron and 20 muscle fibers.
A motor unit made up of a motor neuron and 100 muscle fibers.
A motor unit made up of a motor neuron and 1000 muscle fibers.
In a neuromuscular junction,
the presynaptic terminal is separated from the postsynaptic terminal by the synaptic cleft.
the presynaptic terminal contains vesicles filled with sodium ions.
the presynaptic terminal contains receptor molecules for the neurotransmitter.
the neurotransmitter causes an action potential in the presynaptic terminal.
All of these conditions occur.
The ___________ phase is the time between the application of a stimulus and the beginning of a contraction.
lag/latent
relaxation
contraction
tetanus
refractory
Which of these is NOT a characteristic of smooth muscle tissue?
Spindle-shaped
Striated
Involuntary
Authorhythmic
Hormone Control
Which of the following is NOT a function of the muscular system?
Movement of the body
Contraction of the heart
Communication
Respiration
Structural support
What neurotransmitter travels from the presynaptic vesicles to the postsynaptic membrane via the synaptic cleft?
Acetylcholine
Calcium
Sodium
Potassium
Histamine
