Biology Questions Experiment 2: The Neuromuscular Junction

Each
skeletal muscle is connected to the nervous system be motor end units.
When the neurotransmitter acetylcholine is release at this site, the
muscle fiber depolarizes. Calcium ions are released from stores in the
sarcoplasmic reticulum. The presence of Ca2+ triggers the ratcheting of
actin and myosin filaments and the contraction of the myofiber as all of
the myofibrils contract simultaneously.

Materials

Neuromuscular Junction Digital Slide Images
Neuromuscular Junction (Longitudinal Section) Digital Slide Images

Procedure

1. Examine the digital slide images of the neuromuscular junction.

Neuromuscular junction 100X.

Neuromuscular Junction (Longitudinal Section) 1000X.

Post-Lab Questions

1. Identify the axon, terminal branches, and muscle fibers in the
slide image below. If possible, trace the fiber to its terminus.

2. Are there few or many

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