1. The nervous system and the endocrine system both regulate body activities, but they differ in speed and mechanism. The nervous system uses electrical impulses and neurotransmitters for rapid, short-term responses, while the endocrine system uses hormones released into the bloodstream for slower, longer-lasting effects.
2. Hormones are chemical messengers that travel through the blood to target cells or organs. They bind to specific receptors on target cells, triggering a response. A single hormone can affect multiple organs, and different hormones can have opposing effects (e.g., insulin lowers blood sugar, glucagon raises it).
3. Endocrine glands release hormones directly into the bloodstream (e.g., pituitary, thyroid, adrenal). Exocrine glands release substances through ducts to external surfaces or body cavities (e.g., sweat glands, salivary glands, pancreas—though the pancreas has both endocrine and exocrine functions).
4.
- A: Pituitary gland
- B: Thyroid gland
- C: Adrenal glands
- D: Pancreas
- E: Ovaries (in females) / Testes (in males)
- F: Parathyroid glands
- G: Pineal gland
- H: Thymus gland
Parent Tip: Review the logic above to help your child master the concept of the endocrine system worksheet.
