A muscle in the upper arm that extends (straightens) the arm. The smallest biological structural units of the body: There are different kinds of cells in your body that each do a specific job. are made of different kinds of tissues that work together.
Provide individualized physical education instruction or services to children, youth, or adults with exceptional physical needs due to gross motor developmental delays or other impairments.
TLDR: they work with people who have developmental issues one on one
that secrete their products, hormones, directly into the blood rather than through a duct.