Topic 7 Muscular System: Contraction

Question 1

• Can squeeze blood and lymph vessels, aiding in circulation

- The process occurs via the sliding filament model, which occurs via an “all or nothing” response

Answer 1

Note

Question 2

1. Action potential of a neuron releases acetylcholine
2. Action potential is then generated on the sarcolemma and throughout T-tubules
3. The sarcoplasmic reticulum releases Ca2+
4. Myosin cross bridges form, resulting in Ca2+ binding to troponin on an actin helix
5. At the end of each contraction cycle, Ca2+ is actively pumped back into the sarcoplasmic reticulum

Answer 2

All or nothing response occurs as follows: