The answer is B <span>Endocrine system </span>
- The presence of calcium in the sarcoplasm is directly responsible for exposing the binding sites on actin.
- Rigor mortis occurs after death because detachment of crossbridges does not occur due to the lack of ATP
<h3>What is Sarcoplasm?</h3>
This is defined as the the cytoplasm of striated muscle cells in living organisms .When calcium is present, the binding sites on actin are exposed.
Rigor mortis occurs after death and involves stiffening of the muscle tissue because detachment of cross bridges does not occur due to the lack of ATP.
Read more about Rigor mortis here brainly.com/question/25812860
Answer:
chloroplasts
Explanation:
"<em>Photosynthesis takes place inside plant cells in small things called chloroplasts. Chloroplasts (mostly found in the mesophyll layer) contain a green substance called chlorophyll. Below are the other parts of the cell that work with the chloroplast to make photosynthesis happen.</em>"
Credit goes to https://www.eschooltoday.com for the quote
This model suggests that the cell membrane is a dynamic structure, because the proteins and phospholipids move laterally within the lipid bilayer ( so it is more of a fluid than solid)
(Mark me the brainliest if this has helped)
There are four major classes of biological macromolecules:
carbohydrates.
lipids.
proteins.
nucleic acids.
