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# Forms of Cell Signalling - Autocrine signalling - Paracrine signalling - Endocrine signalling ## Classification of Hormones - **Class 1**: Amino acid derivatives - *Ex: Tyroxine -> Epinephrine, Nor ep;, Dopamine* - **Class 2**: Large protein Hormones - *Ex: Insulin (51 aa), Parathyroid H...

# Forms of Cell Signalling - Autocrine signalling - Paracrine signalling - Endocrine signalling ## Classification of Hormones - **Class 1**: Amino acid derivatives - *Ex: Tyroxine -> Epinephrine, Nor ep;, Dopamine* - **Class 2**: Large protein Hormones - *Ex: Insulin (51 aa), Parathyroid H (84 aa)* - **Class 3**: Cholesteroid derivatives - *Ex: Aldosterone, Cortiost, Testosterone, Estrogen, Progesterone* - **Class 4**: Vitamins - *Ex: Vit Add* ## Hypothalamic and Pituitary Hormones - Most of the anterior pituitary hormones will have negative feedback except LH surge coinciding with estrogen, which causes an increase in LH levels - Hypothalamic releasing factors - *Hypothalamic Hormones* - TRH - CRH - GnRH - GHRH - *Anterior pituitary hormones* - TSH - ACTH - FSH - LH - GH ## Hypothalamic Inhibitory Hormones - Prolactin releasing inhibiting hormone -> Dopamine - Growth hormone -> Somatostatin