Motor nerve impulses pass from a neuron to a muscle cell________. Â Â
| | carried by neurotransmitters |
| | across neuromuscular junctions |
| | across a synapse
|
| | using acetylcholine |
| | all of the choices |
Sarcomeres contain thin filaments of ________ and thickfilaments of ________. Â
| | fast fibers, slow fibers |
| | actin, myosin |
| | hemoglobin, myoglobin |
| | troponin, tropomyosin |
| | creatine, adenosine |
The muscular system consists of all the following EXCEPT
| | sarcomeres |
| | myofillaments |
| | tendons |
| | Voluntary striated skeletal muscle fibers |
| | Voluntary smooth muscle cells |
| | Involuntary striated cardiac muscle fibers |
Skeletal muscle contractions are controlled by___ that stimulateor inhibit contraction of sarcomeres.
| | neuroglia |
| | motor neurons |
| | mitochondria |
| | myoglobins |
