Hormones

Peptide Hormones (synthesis and storage)

Hormones that are made in advance and stored in secretory vesicles

Steroid Hormones (synthesis and storage)

Hormones synthesized on demand from precursors

Catecholamines (synthesis and storage)

Hormones made in advance and stored in secretory vesicles.

Thyroid Hormones (synthesis and storage)

Hormones made in advance; precursor stored in secretory vesicles.

Release from Parent Cell (Peptide Hormones)

Exocytosis.

Release from Parent Cell (Steroid Hormones)

Simple diffusion.

Release from Parent Cell (Catecholamines)

Exocytosis.

Release from Parent Cell (Thyroid Hormones)

Transport protein.

Transport in Blood (Peptide Hormones)

Dissolved in plasma.

Transport in Blood (Steroid Hormones)

Bound to carrier proteins.

Transport in Blood (Catecholamines)

Dissolved in plasma.

Transport in Blood (Thyroid Hormones)

Bound to carrier proteins.

Half-Life (Peptide Hormones)

Short.

Half-Life (Steroid Hormones)

Long.

Half-Life (Catecholamines)

Short.

Half-Life (Thyroid Hormones)

Long.

Location of Receptor (Peptide Hormones)

Cell membrane.

Location of Receptor (Steroid Hormones)

Cytoplasm or nucleus; some have membrane receptors also.

Location of Receptor (Catecholamines)

Cell membrane.

Location of Receptor (Thyroid Hormones)

Nucleus.

Response to Receptor-Ligand Binding (Peptide Hormones)

Activation of second messenger systems; may activate genes.

Response to Receptor-Ligand Binding (Steroid Hormones)

Activation of genes for transcription and translation; may have non-genomic actions.

Response to Receptor-Ligand Binding (Catecholamines)

Activation of second messenger systems.

Response to Receptor-Ligand Binding (Thyroid Hormones)

Activation of genes for transcription and translation.

General Target Response (Peptide Hormones)

Modification of existing proteins and induction of new protein synthesis.

General Target Response (Steroid Hormones)

Induction of new protein synthesis.

General Target Response (Catecholamines)

Modification of existing proteins.

General Target Response (Thyroid Hormones)

Induction of new protein synthesis.