Lesson 11 Notes Regulation of Body Processes - Endocrine System: Regulates body processes using chemical signals o Hormones o Glands o Neurohormones - Other signaling mechanisms o Exocrine System Creates chemical signals in glands, differing from endocrine signals in that the gland has a duct and opens into the digestive tract or outside of body Some glands have endocrine and exocrine functions o Paracrine Signaling Released into the extracellular space and only affect nearby cells Allows tissues and organs to regulate themselves internally Local communication o Autocrine Signaling Cell releases signals that bind to receptors on the same cell, regulating itself o Pheromones Chemicals released into the environment that signal to members of the same species Don’t participate in normal regulation of the body Role in humans is currently speculative and controversial Glands - Endocrine Glands o Ductless o Secrete hormones o Affect cells at a distance o Into blood stream - Exocrine Glands o Duct o Non-hormone secretions o Secretion outside body Including into the digestive tract
Molecular Structure of Hormones Chemical Properties of Hormones - Lipophilic o Travel through bloodstream attached to transport proteins o Can pass through cell membrane to bind with intracellular receptors o Persist for a longer period of time before being destroyed o
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- Fall '19
- Endocrine System, Endocrine gland, o Glands