Module 5

2. Thin collagen layer
6. The functional unit of the nervous system, a nerve cell
8. Nonstriated or not striped, small and only have one nucleus
10. Multistep process in which glucose reacts with oxygen and energy is released
11. Distinct, orderly, striped pattern
12. A stimulus strong enough to create one action potential in a neuron
14. The interface between a nerve cell and another cell
15. Cannot exercise conscious control
17. The repeating unit of a myofibril
18. Stimuli of increasing strength that create more action potentials along more neurons
21. Muscles you can contract consciously
22. Loss of skeletal muscle caused by immobility, aging, malnutrition, etc.

1. A chemical released by a neuron. This chemical travels across the synaptic cleft
3. A stimulus too small to create an action potential in a neuron
4. One motor neuron and all the muscle fibers it innervates
5. The state of partial contraction in a muscle, even when the muscle is not being used
7. Short-term muscle stiffening that occurs after death
9. Only found in the heart
13. A stimulus which is strong enough to create action potentials in all the motor neurons innervating a whole muscle
16. Smooth, not striped
19. Striated, voluntary muscles
20. An individual muscle fiber contracts maximally in response to an action potential