Hello!
Since you didn't provide us with any options, I'll list them for you:
- Smooth ER
- Golgi
- Mitochondria
- Rough ER
- Nucleus
This list is for an animal cell. It varies among the 3+ types of cells, so feel free to specify what type your worksheet is referring to in the comments and I'll help you out!
Answer:
Explanation:
Muscle contraction is stimulated by the movement of an action potential moving along a nerve fiber to the muscles. This event follow some series of process before being stimulated.
1. The impulse arrives at the synapse and travels through the transverse tubules.
2. The muscle impulse reaches the sarcoplasmic reticulum and calcium is released.
3. Calcium floods the sarcoplasm and binds to troponin molecules leaving active sites.
4. Tropomyosin molecules bind to exposed active sites, linking actin and myosin.
5. Thin filaments are pulled over the thick filaments.
6. The muscle fiber shortens and contracts.
B. Positive feedback, it decreases body temperature.
