Question

13 fill in the blank 1 point
a ____ is a bundle of muscle fibers.
14 fill in the blank 1 point
according to the ____ principle, a muscle cell will always contract completely when adequately stimulated by a motor neuron.

Explanation:

1. For question 13: In muscle anatomy, a fascicle (or muscle fascicle) is defined as a bundle of skeletal muscle fibers grouped together, surrounded by connective tissue.
2. For question 14: The all-or-none principle states that a muscle fiber (or neuron) will either contract completely with full force when stimulated to its threshold, or not contract at all.

Answer:

1. fascicle
2. all-or-none