2. Steroids secreted by adrenal cortex(cortisol and aldosterone) ovaries(estrogen and progesterone) testes( testosterone) placenta(estrogen and progesterone) 21CH Pregnenolone 20匚 3B 16 15 H 5~7
11 2. Steroids secreted by adrenal cortex (cortisol and aldosterone), ovaries (estrogen and progesterone), testes (testosterone), placenta (estrogen and progesterone)
3. Derivatives of the amino acid tyrosine(Wk 氨酸), secreted by thyroid(thyroxine and triodothyronine) adrenal medullae(epinephrine and norepinephrine 今004m中 CHS H NH NH3+ Tyrosine Epinephrine
12 3. Derivatives of the amino acid tyrosine (酪 氨酸）, secreted by thyroid (thyroxine and triiodothyronine) adrenal medullae (epinephrine and norepinephrine)
V. Properties of the hormone effect 1. Specificity Receptor Secreting cell Target cell Not a target cell (no receptors)
13 V. Properties of the hormone effect 1. Specificity
The receptors may be present on the plasma membrane in the cytoplasm in the nucleus are protein in nature may contain carbohydrate or phospholipid moieties
14 The receptors may be present on the plasma membrane in the cytoplasm in the nucleus are protein in nature may contain carbohydrate or phospholipid moieties
2. Signal Transmission The role of the hormones is to transit the regulatory signals from the control (endocrine) system to the target cells (organs or glands) enhance or inhibit some function of the target
15 2. Signal Transmission The role of the hormones is to transit the regulatory signals from the control (endocrine) system to the target cells (organs or glands). enhance or inhibit some function of the target