1. The minimum stimulus intensity that will make a muscle contract is called _______________.

2. A state of prolonged maximum contraction of a muscle is called _______________.

3. Parts of the sarcoplasmic reticulum called _______________ lie on each side of a T tubule.

4. Thick myofilaments consist mainly of the protein _______________.

5. The neurotransmitter that stimulates skeletal muscle is _______________.

6. Muscle contains an oxygen-binding pigment called _______________.

7. The _______________ of skeletal muscle play the same role as the dense bodies of smooth muscle.

8. In autonomic fibers that innervate single-unit smooth muscle, the neurotransmitter is contained in swellings called _______________.

9. A state of continual partial muscle contraction is called _______________.

10. _______________ is an end product of anaerobic fermentation that causes muscle fatigue.

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