Red blood cells are produced in bone marrow.
Muscular.-- Jazz(;
The main organ in the excretory system is the kidney. The kidney is the main organ that controls the excretory systems for vertebrates. It is also part of the Urinary system which is part of the excretory system.
Not that I know of, but it does contain chemicals that heal minor wounds such as small cuts and mouth pimples :)
Mucus.
Respiration happens all the time, 24/7, in all living organisms.
what is the function of skeletal system