1.
The ... system digests food and absorbs digested products into the blood.
2.
The ... system exchanges O₂ and CO₂ in the lungs.
3.
The ... system coordinates the body's actions.
4.
The ... system filters toxic waste materials from the blood.
5.
The ... system secretes hormones, which act as chemical messengers.
6.
The ... system produces sperm for males and eggs for females, and allowes the development of an embryo.
7.
The ... system circulates blood to transport O₂, CO₂, nutrients and hormones.
8.
The ... system supports the body and produces blood cells.
9.
The ... system moves the body and produces heat.
10.
The ... system forms white blood cells and aids with immune responses.
