I believe the answer would be friction and/or gravity
Some fun fact to me is that you can compare the cell to a factory - I always found it interesting. So the nucleus would be like the CEO, and the Endoplasmic Reticulum (ER) is like an assembly line - it's actually quite similar to a line like this!. And Ribosomes are the workers on this line.
Answer:
In the endocrine system, chemical messengers called hormones, which circulate through the bloodstream, communicate information from one part of the body to another.
Explanation:
The hormones are secreted by the glands of the endocrine system. The hormones carry chemical messages to the body, the messages are transported through the bloodstream and have metabolic and developmental functions in general.
Centrosome or Centrosomes
The immune system helps neutralize disease and infection. The digestive system processes nutrients from food. The skeletal system includes your bones and supports and protects your body. The correct answer is the nervous system.