Types of Hormones

Prostaglandins

Local hormones affect neighboring cells

Prostaglandins

Not carried in bloodstream

Pheromones

Chemical signals that influence behavior of other individuals

Peptides

Binds to a receptor in plasma membrane

Peptides

Causes formation of cAMP, which activates a cascade of enzymes

Steroids

Lipids that enter a cell

Steroids

Affect gene activity, protein synthesis