Endorphins sound correct.
Please vote my answer brainliest! thanks.
First state a Thesis.
Ex. The Water cycle is important to nature because it replenishes water every day.
Next you organize your paper into sub sections.
Ex.
I. Process of the water cycle
A. evaporation ( water evaporates into the air from oceans, lake's, puddles)
B. condensation ( water droplets collect to form a cloud)
C. precipitation ( weather such as snow, sleet, hail, rain)
You should do this until at least 5 sections ( conclusion is last)
Please vote this branliest answer! Thanks.
When something needs to be transported against its concentration gradient, or a molecule is too big to simply diffuse through a membrane, active transport has to be used. So active transport requires energy (ATP).
Examples:
1. Antiport pumps: transport one substance in one direction while transporting another substance the other way. An example of this is the sodium-potassium pump.
2. Symport pumps - uses a substance that wants to move from an area of high concentration to low concentration and carries another substance against its concentration gradient. An example of this is the sodium-glucose transport protein
3. Endocytosis - large amounts of extra cellular fluid can be taken into a cell - needs ATP to bind proteins in the cell membrane and causes them to change their shape...which eventually causes the surrounding of the fluid to be brought in (a vesicle).
4.exocytosis - opposite of above
