WorksheetsA&P 1 Chapter 8
Total questions: 37
Worksheet time: 19mins
Functions of muscle include
the heartbeat. e include
muscle tone. e include
production ofheat. clude
moving bodyparts. clude
All of the choices are correct.
The moveable end of a muscle is attached at its
origin le end of a muscle is attached at its
fulcrum e end of a muscle is attached at its
insertion
motor endplate
source
Compared to skeletal muscle, smooth muscle
contracts more slowly and relaxes more slowly
contracts moreslowly and relaxes more rapidly
contracts morerapidly and relaxes more slowly
contracts morerapidly and relaxes more rapidly
is under voluntarycontrol
The term "muscle" can refer to
a cell
a tissue
an organ
All of the choices are correct.
Correctly order the sequence of events that occur in muscle contraction.
Ca released, actin sites exposed, ADP and P release from myosin, myosin heads bind actin, ATP binds to myosin, ATP split
ATP binds to myosin, ATP split, Ca released, actin sites exposed, myosin heads bind to actin, ADP and P release from myosin
ADP and P release from myosin, ATP split, Ca released, myosin heads bind to actin, actin sites exposed, ATP binds to myosin
Ca released, actin sites exposed, myosin heads bind to actin, ADP and P release from myosin, ATP binds to myosin, ATP split
Myosin heads bind to actin, actin sites exposed, ATP split, ATP binds to myosin, Ca released, ADP and P release from myosin
Multiunit smooth muscle
tends to displayrhythmicity
responds tostimulation by neurons and certain hormones
None of thechoices apply. s and certain hormones
is composed ofsheets of muscle cells n hormones
occurs in thewalls of the stomach and intestines
A sarcomere is best described as _______
a part of the sarcoplasmic reticulum
a group of fascicles
a group of myofibrils
a unit within a myofibril
All of the choices are correct.
Myofibrils are composed primarily of
actin and myosin
ATP and ADP
troponin andtropomyosin
fascia andtendons
perimysium and endomysium
A motor unit typically includes
muscle fibersonly
motor neuronsonly
several motorneurons and one muscle fiber
one motor neuron and several muscle fibers
several motorneurons and several muscle fibers
The muscle primarily responsible for opposing a particular action is called the
antagonist
prime mover
synergist
agonis
origin
Choose the response that best characterizes the concept of recruitment of motor units.
Recruitment of motor units allows for short latent periods between muscle contractions
Recruitment of motor units helps to generate maximal muscle tension
Recruitment of motor units allows us to lift heavy things
Recruitment of motor units are required for postural stability
Recruitment of motor units helps to generate maximal muscle relaxation
An example of a partial but sustained contraction of a whole muscle is
muscle tone
fatigue of a motor unit
a twitch
eye blinking
tetaniccontraction of a muscle fiber
Which muscles of the pelvic floor assist in defecation?
bulbospongiosus
Only A
Both A & B
Coccygeus
Only B
A neurologist asks her patient to “press on the gas like you’re driving a car” during the physical exam. Choose the response that provides the correct action and muscle that could perform this action.
Dorsiflexion; soleus
Plantar flexion; tibialis anterior
Plantar flexion; gastrocnemius
Dorsiflexion; fibularis tertius
Plantar flexion; flexor digitorum longus
Binding sites on the surface of actin allow the formation of cross bridges with molecules of
ATP
myosin
troponin
tropomyosin
creatine
The amount of oxygen needed to support the conversion of lactic acid to glucose by the liver is called the
refractoryquantity
oxygen debt
anaerobicvalue
aerobicconversion
lactate debt
A man suffers an injury and is no longer able to extend his leg at the knee. Which of the following muscles DOES NOT extend the leg at the knee?
Vastus intermedius
Vastus lateralis
Vastus medialis
Rectus femoris
semimembranosus
A muscle cramp is most likely due to a temporary lack of
actin
myosin
ATP
ADP
motor neurons
The electrical impulse that triggers a contraction travels deep into a skeletal muscle fiber by means of
sarcoplasmicreticulum
transversetubules
mitochondria
motor endplates
gap junctions
A woman goes to see her doctor complaining of not being able to move her arm. The doctor determines that the woman is unable to medially rotate her arm. Which muscle is responsible for this action?
Infraspinatus
Subscapularis
Teres minor
Supraspinatus
Deltoid
Neurotransmitter molecules are stored in vesicles within
myofibrils
motor units
motor endplates
motor neuronendings
sarcomeres
Choose the correct statement.
All of the above
The stapedius is the smallest muscle in the body
The largest muscle in the body is the gluteus maximus
None of the above
The frontalis and occipitalis muscles comprise the epicranius
The enzyme acetylcholinesterase causes acetylcholine to
bind to actin
be secreted fromthe motor end plate
decompose
form crossbridges
None of thechoices are correct.
In a recording of a muscle twitch, the delay between the time a stimulus is applied and the time the muscle responds is called the
refractoryperiod
relaxationperiod
latent period
contractionperiod
recovery period
Why is sprinting considered an anaerobic exercise?
Sprinting requires muscle metabolism.
Sprinting uses glycolysis.
Sprinting uses anaerobic respiration as oxygen supply is insufficient for cellular requirements.
Sprinting uses aerobic respiration as blood flow provides sufficient oxygen for cellular requirements.
Sprinting changes the metabolic capacity of a muscle.
Choose the statement that is NOT TRUE.
Gluteus maximus flexes the thigh at the hip
Gracilis abducts the thigh
Tensor fasciae latae adducts the thigh
None of the above
All of the above
Creatine phosphate
causes thedecomposition of ATP
causes thedecomposition of ADP
supplies energy for the synthesis of ATP
supplies energyfor the breakdown of ATP to ADP
binds to Ach receptors
Choose the statement that is NOT TRUE.
Supraspinatus adducts the arm
Supraspinatus abducts the arm
Teres minor laterally rotates the arm
Latissimus dorsi extends arm at the shoulder
Pectoralis major flexes the arm at the shoulder
Activities such as distance swimming and distance running are most likely to stimulate development of
slow fatigablemuscle fibers
fast fatigablemuscle fibers
slow fatigue-resistant muscle fibers
fastfatigue-resistant muscle fibers
None of thechoices are correct.
In what way is an oxygen debt related to anaerobic respiration?
Oxygen debt occurs during strenuous exercise as oxygen deficiency causes lactic acid to be produced during anaerobic respiration.
Oxygen debt occurs as lactic acid created by anaerobic respiration dissociates to form lactate.
Oxygen debt occurs after anaerobic respiration and is the amount of oxygen required to convert lactate to glucose and restore supplies of ATP and creatine phosphate.
Oxygen debt occurs as energy is lost as heat during cellular respiration.
Oxygen debt occurs before anaerobic respiration begins.
When a muscle undergoes atrophy in response to disuse,
the size of actinand myosin filaments decreases
All of the answer choices are correct.
the number ofmitochondria decreases
there is areduction in capillary networks
the muscle getssmaller
During cellular respiration, the maximum theoretical number of ATPs generated per cell is 30 in skeletal muscle. How many ATP is generated through anaerobic respiration?
28 ATP
30 ATP
0 ATP
2 ATP
26 ATP
The increase in the number of motor units activated as a result of more intense stimulation is called
latency
recruitment
thresholdstimulation
all-or-noneresponse
summation
Muscle fibers rely on anaerobic respiration to obtain energy under which of the following conditions?
When skeletal muscles are moderately active
When skeletal muscles are resting
When skeletal muscles are moving slightly
Muscle fibers never rely on anaerobic respiration to obtain energy
When skeletal muscles are used strenuously for a minute or two
The characteristic reddish brown color of skeletal muscle comes from which substance?
actin
myosin
myoglobin
calcium
muscle glycogen
The threshold stimulus is the
minimum strengthof stimulus required to cause muscle fiber contraction to occur
the maximalamount of force a muscle can exert
the amount ofoxygen a muscle needs for repeated contractions
the minimalamount of force a muscle can exert
the maximal amount of stimulation amuscle can withstand
Rigor mortis that occurs in skeletal muscles a few hours after death is due to
lack of ATPincreased membrane permeability to calcium ions
None of thechoices are correct.
excessive ATPdecreased membrane permeability to calcium ions
a decrease in thenumber of musclefibers
persistentstimulation by motor neuron
