Question

The Neuromuscular Junction Complete the sentences in the following paragraph. The word list for the blanks are in the key accompanying the illustrations below. Label the illustrations using key words or their numbers. Skeletal muscles require stimulation from somatic motor neurons before they can contract. The axon from each of these neurons subdivides into branches each of which serves a single muscle fiber. Each branch ends in an which expands to form a . Within this expanded region are spherical sacs, the containing the transmitter acetylcholine (ACh). When a nerve impulse reaches the end of the axon, ACh is released and diffuses across a narrow space, the . The ACh then binds to its receptors on the motor end plate of the , the the cell membrane of the adjacent muscle fiber, leading to a muscle action potential. The action potential stimulates the release of calcium ions from the SR, causing sarcomeres within the cylindrical __ of the muscle fiber to contract. Key 1. sarcolemma (two places) 2. axon terminal (two places) 3. synaptic cleft 4. synaptic vesicles 5. synaptic end bulb (two places) 6. myofibrils

          The Neuromuscular Junction
Complete the sentences in the following paragraph. The word list for the blanks are in the key accompanying
the illustrations below. Label the illustrations using key words or their numbers.
Skeletal muscles require stimulation from somatic motor neurons before they can contract. The axon from
each of these neurons subdivides into branches each of which serves a single muscle fiber. Each branch
ends in an ______ which expands to form a ______. Within
this expanded region are spherical sacs, the ______ containing the transmitter
acetylcholine (ACh). When a nerve impulse reaches the end of the axon, ACh is released and diffuses across
a narrow space, the ______. The ACh then binds to its receptors on the motor end
plate of the ______, the ______ the cell membrane of the adjacent muscle fiber, leading to a muscle
action potential. The action potential stimulates the release of calcium ions from the SR, causing sarcomeres
within the cylindrical ______ of the muscle fiber to contract.
Key
1. sarcolemma (two places)
2. axon terminal (two places)
3. synaptic cleft
4. synaptic vesicles
5. synaptic end bulb (two places)
6. myofibrils

The Neuromuscular Junction
Complete the sentences in the following paragraph. The word list for the blanks are in the key accompanying
the illustrations below. Label the illustrations using key words or their numbers.
Skeletal muscles require stimulation from somatic motor neurons before they can contract. The axon from
each of these neurons subdivides into branches each of which serves a single muscle fiber. Each branch
ends in an which expands to form a . Within
this expanded region are spherical sacs, the containing the transmitter
acetylcholine (ACh). When a nerve impulse reaches the end of the axon, ACh is released and diffuses across
a narrow space, the . The ACh then binds to its receptors on the motor end
plate of the , the the cell membrane of the adjacent muscle fiber, leading to a muscle
action potential. The action potential stimulates the release of calcium ions from the SR, causing sarcomeres
within the cylindrical of the muscle fiber to contract.
Key
1. sarcolemma (two places)
2. axon terminal (two places)
3. synaptic cleft
4. synaptic vesicles
5. synaptic end bulb (two places)
6. myofibrils

Added by Christopher C.

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