BI110 Chapter Notes - Chapter 137: Cardiac Arrhythmia, G Protein–Coupled Receptor, Sex Steroid
Document Summary
Five categories: based on how the signal is transmitted and how far it travels. Cell responds to a chemical signal that it secretes. Used to amplify or maintain a physiological response. The chemical signalling molecule (local regulator) only acts on a short distance from where it is secreted. Used in differentiation of t cells of the immune system: causes t cell division and differentiation. Responses occur in cells close to the signalling cell. Plays a key role in embryonic development. Local regulators: local regulators are used to mediate limb development, only occurs in specific regions of the body. Hormones are used: circulate in the blood, secreted by endocrine cells, which are found in the endocrine system. Some of these are endocrine glands, yet other endocrine tissues can be found in other organs; for example, the stomach. Permits communication between distant cells in the body. Physiological functions are regulated here: digestion, metabolism, salt balance, growth and development, reproduction.
