front 1 Define isometric contraction | back 1 the tension generated does not overcome the load, so there is no visible shortening of the muscle fiber (although crossbridge cycling is happening) |
front 2 define isotonic contraction | back 2 the tension generated DOES overcome the load, so there is measurable shortening of the fiber. |
front 3 What is another word for "thick filaments" | back 3 Myosin |
front 4 What is another word for "thin filaments" | back 4 Actin |
front 5 During sarcomere contraction, which of the following does NOT change length? a) the distance between the Z-lines b) the length of the I bands c) the length of the A-bands d) none of the above change length | back 5 c) the length of the A-bands |
front 6 During sarcomere contraction, Ca binds to ______________ , which allows ______________to move and reveal the ______________ active sites for crossbridge formation. | back 6 troponin; tropomysin; actin |
front 7 Order of Crossbridge Formation: | back 7 1. AP reaches T-tubules 2. Ca is released from the SR 3. Ca binds to troponin 4. Tropomyosin moves to reveal active sites 5. Crossbridge Forms |
front 8 Which one of the following components stimulates contraction of a skeletal muscle? a) muscle fiber b) motor neuron c) acetylcholinesterase d) synaptic cleft | back 8 b) motor neuron |
front 9 Which structure of the neuromuscular junction is a chemically-gated ion channel that the neurotransmitter binds to? a) voltage-gated sodium channel b) voltage-gated calcium channel c) acetylcholine receptor d) synaptic vesicle | back 9 c) acetylcholine receptor |