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43 Cards in this Set

  • Front
  • Back
Which fo the following is the correct sequence of events for muscle contractions?
A)neurotransmitter release, motor neuron action potential, muscle cell action potential, release of calcium ions from SR,ATP-driven power stroke
B)muscle cell action potential, neurotransmitter release,ATP-driven power stroke,calcium ion release from SR,sliding of myofilaments
C)neurotransmitter release,muscle cell action potential,motor neuron action potential,release of calcium ions from SR, Sliding of myofilaments, ATP-driven power stroke
D)motor neuron action potential, neurotransmitter release,muslce cell action potential, release of calcium ions from SR, ATP-driven power stroke,Sliding myofilaments
D)motor neuron action potential, neurotransmitter release,muslce cell action potential, release of calcium ions from SR, ATP-driven power stroke,Sliding myofilaments
Excitation-contraction coupling requires whichof the following substances?
Ca2+ and ATP
What is the main factor that determines the power of a muscle?
the total number of muscle cells available for contraction
What part of the sarcolema contains acetycholine receptors?
motor end plate
Which of the following muscle pairs are antagoists of each other?
A)sternocleidomastoid and splenius capitis
B)pectoralis major and pectoralis minor
C)biceps femoris and semitendinosus
D)rectus femoris and vastus medialis
A)sternocleidomastoid and splenius capitis
Mucle tone is____.
A)the condition of athletes after intesive training
B)the ability of a muscle to effeciently cause skeletal movements
C)the feeling of well-being following excercise
D)a state of sustained partial contraction
D)a state of sustained partial contraction
Immediatly following the arrival of the stimulus at a skeletal muscle cell there is a short period called the _______period during which the events of excitation-contraction coupling occur.
latent
What is the role of tropomysin in skeletal muscles?
A)Tropomyosin serves as a contraction inhibitor by blocking the actin binding sites on the myosin molecules
B)Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.
C)Tropomyosin is the name of a contracting unit.
D)Tropomyosin is the receptor for the motor neuron neurotransmitter.
B)Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.
Hyothetically, if the skeletal muscle were stretched to the point where thick and thin filaments no longer overlapped_____.
A)ATP consumption would increase because the sacromere is "trying" to contract
B)no muscle tension could be generated
C)maxium force production would result because the muscle has a maximum range of travel
D)cross bridge attachment would be optimum because of all the free binding sites on actin.
B)no muscle tension could be generated
What is the fuctional role of the T-tubules?
A)synthesize the ATP to provide energy for muscle contraction
B)stabilize the G and F actin
C)enhanc cellular communication during muscle contration
D)hold cross bridges in place in a resting muscle
C)enhanc cellular communication during muscle contration
When the term biceps,tricepts, or quadricepts form part of a mucscles name, what does it tell you about the muscle.
the muscle has two, three or four origins respectively.
Which of the following muscles is not a facial muscle?
A)Masseter
B)orbicularis oculi
C)zygomaticus minor
D)trapezius
D)trapezius
Myoglobin______.
stores oxygen in muscle cells
Which of the following doesn't compress the abdomen?
A)transversus abdominis
B)external oblique
C)coccygeus
D)internal oblique
C)coccygeus
Smooth muscles that act like skeletal muscles but are controlled by autonomic nerves and hormones are______.
muliunit muscle
Which muscles is (are) comtracted to exhale forcibly.
A)internal intercostals
B)diaphragm
C)internal intercostals and external intercostals
D)external intercostals and diaphragm
A)internal interostals
The extensor carpi radialis pattern_____.
A)extends the thumb and is a deep muscle
B)extends and abducts the wirst and is short
C)supinates the forearm and is a superficial muscle
D)extends and adducts the wirst and has a small tendon
B)extends and abducts the wirst and is short
In a pennate muscle pattern______.
A)muscles appear to be straplike
B)there is a broad origin and fascicles converge toward a single tendon
C)there is a narrow origin diverging to a broad insertion
D)muscles look like a feather
D)muscles look like a feather
Which muscle cells have the greatest ability to regenerate?
smooth
which of the following are composed of myosin?
A)thick filaments
B)all myofilaments
C)Z discs
D)thin filaments
A)thick filaments
Activate synaptic vesicles in axon terminals.
calcium ions
Influx results i muscle cell depolarization
sodium ions
Released from the motor neuron to initiate muscle depolarization.
Acetylcholine
The situation in wich contractions become stronger due to stimulation before complete relaxation occurs.
wave summation
The stimulus above which no stronger contraction can be elicited, because all motor units are firing in the muscle.
Maximal stimulus
Continued sustained smooth contraction due to rapid stimulation.
tetanus
Muscle that opposes and reverses the action of another muscle.
Anatagonist
Muscle that is primarily responsible for bring about a particular movement.
Prime mover
Muscle that stabilizes the origin of another muscle.
fixator
Muscle that aids another by promoting the same movement
synergist
The diaphragm is the prime moverof inspiratory breathing
True
Extensor digitorum longus is found in the forearm
false
Myosin and actin are present in all three types of muscle tissue.
true
The epimysium is the connective tissue layer that surrounds a muscle fiber.
false
sacromeres are present in smooth muscle
false
Calcium is returned to the terminal cisternae through active transport
true
Varicosities are seen in skeletal muscles and in multiunit smooth muscle.
false
Slow oxidative fibers have fast contractions and fatigue rapidly.
false
During a muscle contraction the thick filaments are moved toward the center of the sacromere.
false
an ismetric contraction is one where tension increases but muscle length doesn't change.
True
Only_____muscle cells commonly branch.
cardiac
Thick filaments are found in the _____of the sacromere.
H-zone
The ______is the main chewing muscle.
masseter