Question

Key to correctly identify the structures described below.. 1. connective tissue covering a bundle of muscle fibers (4) Perimysium 2. bundle of muscle fibers (c) Fascicle 3. contractile unit of muscle 4. superficial sheath of muscle (h) Sarcolemma (b) epimysium 5. thin areolar sheath that covers the entire muscle (muscle fiber (a) endomysium 6. plasma membrane of the muscle fiber (g) sarcolemma 7. a long organelle of the muscle fiber found within muscle fibers (d) myofibril 8. actin-or myosin-containing structure (e) myofilament 9. cord of collagen fibers that attaches a muscle to a bone (i) tendon Key: a. endomysium b. epimysium c. fascicle d. myofibril e. myofilament f. perimysium g. sarcolemma h. sarcomere i. tendon Complete the following statements: The junction between a motor neuron's axon and the muscle fiber plasma membrane is called a 1 junction. A motor neuron and all of the skeletal muscle fibers it stimulates is called a 2. The actual gap between the axon terminal and the muscle fiber is called a 3 Within the axon terminal are many small vesicles containing a neurotransmitter substance called 4 When the 5 reaches the ends of the axon, the neurotransmitter is released and diffuses to the muscle cell membrane to combine with receptors there. The combining of the eurotransmitter with the muscle membrane receptors causes a change in permeability of the membrane, resulting in 6 of the sarcolemma. Then, contraction of the muscle fiber occurs. 1. Neuromuscular junction 2. Motor unit 3. Synaptic cleft 4. Acetylcholine (Ach) 5. Action potential 6. Depolarization

Key to correctly identify the structures described below..
1. connective tissue covering a bundle of muscle fibers (4) Perimysium
2. bundle of muscle fibers (c) Fascicle
3. contractile unit of muscle
4. superficial sheath of muscle (h) Sarcolemma (b) epimysium
5. thin areolar sheath that covers the entire muscle (muscle fiber (a) endomysium
6. plasma membrane of the muscle fiber (g) sarcolemma
7. a long organelle of the muscle fiber found within muscle fibers (d) myofibril
8. actin-or myosin-containing structure (e) myofilament
9. cord of collagen fibers that attaches a muscle to a bone (i) tendon
Key:
a. endomysium
b. epimysium
c. fascicle
d. myofibril
e. myofilament
f. perimysium
g. sarcolemma
h. sarcomere
i. tendon
Complete the following statements:
The junction between a motor neuron's axon and the muscle fiber plasma membrane is called
a 1 junction. A motor neuron and all of the skeletal muscle fibers it stimulates is called
a 2. The actual gap between the axon terminal and the muscle fiber is called a 3
Within the axon terminal are many small vesicles containing a neurotransmitter substance
called 4 When the 5 reaches the ends of the axon, the neurotransmitter is released and
diffuses to the muscle cell membrane to combine with receptors there. The combining of the
eurotransmitter with the muscle membrane receptors causes a change in permeability of the
membrane, resulting in 6 of the sarcolemma. Then, contraction of the muscle fiber occurs.
1. Neuromuscular junction
2. Motor unit
3. Synaptic cleft
4. Acetylcholine (Ach)
5. Action potential
6. Depolarization

Added by Gilbert W.

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