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☆☆☆☆☆The endocrine system affects cells with certain receptors .
The nervous system can affect only nearby cells
Thymus
Inflammation and fever are nonspecific immune system reactions.
The endocrine system sends messages using hormones. It delivers messages from the nervous system to the excretory system. It tells the excretory system when the blood is out of balance.
Adrenalin.
One gland causes calcium ions to be released; another gland causes them to be absorbed
Depends on when you consider it a child. First it's a Zygote, a fertilized egg, and then a blastocyst. Medically it's not a child until it's born. But if we start with embryo you can read all about it in the link below. Someone wrote blood starts pumping and arms starts to develop but that is weeks later.
Blood pumps through the body.
or
Rhythmic breathing movements
the organs grow larger
A sperm or egg
eyes develop
lips start to form
Vocal cords develop.
Steroid hormones
The pancreas releases insulin into the bloodstream
