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.
Answer:
Facilitated Diffusion
Explanation:
Some molecules can move down their concentration gradients by crossing to the lipid portion of the membrane directly,while others must pass through membrane protein s in a process called Facilitated Diffusion
Answer:
I'll take a look at your question
Explanation:
The Carbon Cycle is important to the life and development of Trees and Plants as a whole.
We breathe in Oxygen that is provided from the Trees that provide that provide it.
We exhale Co2 ((Carbon Dioxide)) for the Trees to breathe in. This entire cycle and process ensures that we survive as a planet.
As it is an essential part of life
The answer is A. The insulin, like many hormones binds to cells through receptors found on the cell membrane
7. Phloem & xylem.
And I’m not sure about 8