BIOL 2113 QUESTIONS AND ASWERS LATEST UPDATE
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Place the following events of excitation in the correct order.
1.ion channels on the sarcolemma open and sodium ions enter the muscle fiber
2.the entry of sodium ions into the muscle fiber depolarizes the sarcolemma
locally
3.acetylcholine is released from vesicles in the motor neuron into the synaptic
cleft
4.an action potential arrives at the axon terminal of a motor neuron
5.acetylcholine binds to ligand-gated sodium ion channels in the motor end plate
4, 3, 5, 1, 2
Muscle contraction can occur when:
sarcomeres shorten.
In response to physical inactivity, we expect to see muscles:
atrophy.
Muscles attach to skeletons via
Tendons
Which of the following is best described by "E" in Figure 9.2
None of these answers are correct
Where would calcium ions be predominately found?
Figure 10-1 Skeletal Muscle Fiber
None of these answers are correct
Identify the muscle labeled "6." in Figure 11-1
brachialis
____________ are thick filaments of muscle contraction.
Myosin
Together 4 & 5 are known as________
Figure 10-1 Skeletal Muscle Fiber
myofilament
Which of the following is best described by "junction between the axon and a
muscle fiber."?
None of these answers are correct
Which of the following wraps and surrounds an individual skeletal muscle fiber?
endomysium
Which protein does NOT belong in a thin filament?
myosin
Identify the muscle labeled "1." in Figure 11-2
None of the answers are correct
Using figure 9.1 which of the following is "A"
None of these answers are correct
Which of the following is best described by "small fluid filled gap between a
neuron and a muscle fiber."?
Synaptic cleft
100% CORRECT A+ GRADED. Buy Quality Materials!
Place the following events of excitation in the correct order.
1.ion channels on the sarcolemma open and sodium ions enter the muscle fiber
2.the entry of sodium ions into the muscle fiber depolarizes the sarcolemma
locally
3.acetylcholine is released from vesicles in the motor neuron into the synaptic
cleft
4.an action potential arrives at the axon terminal of a motor neuron
5.acetylcholine binds to ligand-gated sodium ion channels in the motor end plate
4, 3, 5, 1, 2
Muscle contraction can occur when:
sarcomeres shorten.
In response to physical inactivity, we expect to see muscles:
atrophy.
Muscles attach to skeletons via
Tendons
Which of the following is best described by "E" in Figure 9.2
None of these answers are correct
Where would calcium ions be predominately found?
Figure 10-1 Skeletal Muscle Fiber
None of these answers are correct
Identify the muscle labeled "6." in Figure 11-1
brachialis
____________ are thick filaments of muscle contraction.
Myosin
Together 4 & 5 are known as________
Figure 10-1 Skeletal Muscle Fiber
myofilament
Which of the following is best described by "junction between the axon and a
muscle fiber."?
None of these answers are correct
Which of the following wraps and surrounds an individual skeletal muscle fiber?
endomysium
Which protein does NOT belong in a thin filament?
myosin
Identify the muscle labeled "1." in Figure 11-2
None of the answers are correct
Using figure 9.1 which of the following is "A"
None of these answers are correct
Which of the following is best described by "small fluid filled gap between a
neuron and a muscle fiber."?
Synaptic cleft
