| Hormone | Organism Type | Source Gland or Site of Synthesis | Principal Functions | Related Conditions or Stimuli |
|---|---|---|---|---|
| Auxin | Plant | Shoot tip | Promotes cell elongation; facilitates phototropic bending towards light. | Light |
| Gibberellins | Plant | Not in source | Promotes the growth of the stem. | Growth |
| Cytokinins | Plant | Fruits and seeds (areas of rapid cell division) | Promotes cell division. | Rapid cell division |
| Abscisic acid | Plant | Not in source | Inhibits growth; causes wilting of leaves. | Wilting |
| Adrenaline | Animal (Human/Squirrel) | Adrenal glands | Prepares the body for fight or flight; increases heart rate and breathing rate; diverts blood to skeletal muscles. | Scary situations |
| Thyroxin | Animal (Human) | Thyroid gland | Regulates carbohydrate, protein, and fat metabolism for growth balance. | Goitre (caused by iodine deficiency) |
| Growth hormone | Animal (Human) | Pituitary gland | Regulates growth and development of the body. | Dwarfism (deficiency); Gigantism (excess) |
| Insulin | Animal (Human) | Pancreas | Regulates blood sugar levels. | Diabetes (insufficient secretion) |
| Testosterone | Animal (Human male) | Testes | Regulates changes associated with puberty in males. | Puberty |
| Oestrogen | Animal (Human female) | Ovaries | Regulates development of female sex organs and the menstrual cycle. | Puberty |
| Releasing hormones | Animal (Human) | Hypothalamus | Stimulates the pituitary gland to release hormones. | Regulation of growth hormone levels |
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