BIO1022 Lecture Notes - Lecture 6: Secondary Sex Characteristic, Neurohormone, Endocrine System
13 Oct 2018
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Hormones: a chemical signal that is secreted into the circulatory system and communicates regulatory messages within the body (cid:1679) in order to behaviour in the certain way(target cell) Regulatory systems--animals have two systems of internal communication and regulation: 1. nervous system 2. endocrine system. The nervous system--conveys high-speed electrical signals along specialised cells called neurons - These messages control movement of body parts in response to sudden environmental change (rapid communicate system) Overlap between endocrine and nervous systems--structurally, chemically, and functionally related:1. neurosecretory cells secrete hormones (known as neurohormones) into the blood. Some chemicals (e. g. epinepherine)[neuro-secreted cell] serve as both hormones of the endocrine system and chemical signals in the nervous system 2. Nervous system also plays a role in certain sustained responses (e. g. day/night cycles) by increasing or decreasing secretions from endocrine glands. Control pathways--a receptor, or sensor, detects a stimulus and sends information to a control center. There are 3 types of hormonal control pathways: 1.
