The Endocrine System

•Endocrine glands produce hormones•Hormones are secreted directly into the blood•Blood transports them all over the body

•Target cells have specific receptors in their membranes which the molecules bind to

•Groups of target cells are called target tissue

Types of hormones

1.Protein and peptide hormones (and those that are derivatives of amino acids)

2.Steroid hormones

How do hormones work?

Adrenaline (a protein hormone)

Receptor

Adenyl Cyclase

Adrenaline

Cell membrane

How do hormones work?

Adrenaline (a protein hormone)

How do hormones work?

Adrenaline (a protein hormone)

ATP Cyclic AMP(cAMP)