Chapter 45: Hormones & The Endocrine System . Steph Jones AP Biology Ms. Loughnane. Basics. Hormone: a chemical signal that is secreted into the circulatory system (usually the blood) and communicates regulatory messages within a body
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Nervous System & Endocrine System
Endocrine, Neurohormone, Neuroendocrine.
* Remember: the same hormone can have different effects on target cells that have:
ex: nitric oxide (NO) is released by by blood vessels when blood oxygen level falls. NO activates an enzyme that relaxes smooth muscle cells, which dilates vessels and improves blood flow to tissues
the Hypothalamus; has two parts:
- Posterior Pituitary: stores and secretes 2 hormones that are made by neurosecretory cells located in the hypothalamus
- Anterior Pituitary: make and secrete at least 6 hormones into the blood
-Androgens stimulate development/maintenance of male reproductive system
- Estrogen maintain female reproductive system and female secondary sex characteristics
- Progestinsprepare/maintain uterus