A hormone.
yes
The endocrine system controls growth and general health of the body.
Simply put, a hormone is a chemical substance produced in the body that controls and regulates the activity of certain cells or organs.
growth of the body
By your nervous system
The circulatory system circulates fluids through your body. The endocrine system controls growth and body processes through the use of chemical messengers called hormones.
the pituitary gland secretes a hormone which controls he growth of all parts of the body
Melanogenisis is the activity that controls melanocytes. Melanocytes are the cells in the human body that produce melanin, the pigmentation found in eyes and skin.
pitutary gland
Endocrine system
The nucleus is the chemical control center of the cell.
The endocrine system, which includes the pituitary gland, the subaceous glands, the thyroid gland, the suprarenal glands, the pancreas, and the gonads. The endocrine system controls many structural and functional changes during development and adjusts metabolic activity and energy use by the body.