In a cell protein synthesis is the primary function of

Transcription!!

quick review of transcription: info that has been encoded into the DNA is duplicated to an RNA (Ribonucleic Acid) molecule. The molecule is then sent to the cytoplasm (the gel-like protection around the cell membrane). This helps bring together the all the pieces that are necessary for the protein synthesis. They are amino acids, tRNA, ribosomes, and other components. When in the cytoplasm the protein polymers  are  synthesized through means of chemical reactions.  Then it gets converted to messenger RNA And on and on the process goes.

Hopefully this helped and good luck. If you need me to go into further detail just let me know.

endo:

regulates body hormones, aldosterone, vasopressin

neural:

signal, regulates body using electric signals, reflex

endo has to do with hormones; aldosterone and vasopressin are both hormones. i also had this question and got it right : d

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.