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:
There are more than 500 plant species found on the Galapagos, about one-third of which are endemic.
Explanation:
Endemic meaning that these plant species are native to the islands and found nowhere else in the world. There are also exclusive species of cotton, guava, passion flower, pepper and tomatoes that all grow there.
Answer: The process is called oxidative phosphorylation and it happens inside mitochondria.
Explanation:
The arrangement of specialized parts within a living thing is sometimes referred to as levels of organization. Cells, of course, are the first level of organization. In any multicellular organism, cells rarely work alone. Cells that are similar in structure and function are usually joined together to form tissues.
