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| Question | Answer |
| Mechanisms for cell communications | - Gap Junction - NeuroTransmitters - Paracrine (local) hormones - Hormones |
| Gap Junction | Pores in cell membrane allow signaling chemicals to move from cell to cell |
| Define Hormone | Hormones are chemical messengers that are secreted into bloodstream, stimulating response in other tissues and organs |
| Organs of Endocrine System | - hypothalamus - pituitary gland - thyroid - parathyroids - adrenal glands - pineal body - reproductive glands (which include the ovaries and testes) - pancreas |
| Endocrine Glands | - Ductless glands - Release hormones into tissue fluids - has dense capillary networks to distribute hormones - intracellular effects - alter target cell metabolism |
| Exocrine Glands | - Carry secretion to body surface or other organ cavity - Extracellular effects ( Food Digestion) |
| Nervous System | - Electrical impulses and neurotransmitters, adapts quickly to continual stimulation - reacts quickly (1 -10 msec), stops quickly - Local, specific effects on target organs |
| Endocrine Systems | - Hormones in blood, adapts slowly ( days to weeks) - Reacts slowly (seconds-days), can continue after stimulus stops - General, widespread effects on many organs |
| Hypothalamus communicates | - Connected to the pituitary gland by a complex of blood vessels called the hypothalmo-hypophyseal portal |
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