Chapter 6 Notes - Communication, Integration & Homeostasis (Signaling)

Chapter 6 Notes - Communication, Integration & Homeostasis (Signaling)

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
A combination of simple diffusion across small distances, widespread distribution of molecules through the circulatory system, and rapid, specific delivery of messages by the nervous system enables each cell in the body to communicate with most other cells and maintain homeostasis. Gap junctions – form direct cytoplasmic connections between adjacent cells - Direct transfer of electric and chemical signals between adjacent cells - When these are open, ions and small molecules diffuse directly from the cytoplasm of one cell to the cytoplasm of the next. Contact-dependent signals – require interaction between membrane molecules on two cells - Occurs when surface molecules on one cell membrane bind to surface molecules on another cell membrane. - Require cell-to-cell contact Autocrine signals – act on the same cell that secreted them (a cell sends a signal to itself) Paracrine signals – secreted by one cell and diffuse to adjacent cells (immediate vicinity) - Like histamine - cytokines Electrical signals – changes in a cell’s membrane potential Chemical signals – molecules secreted by cells into the ECF Neural signals, hormones and neurohormones carry out long-distance communication. Hormones
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/07/2010 for the course CBN 356 taught by Professor Merill during the Spring '08 term at Rutgers.

Page1 / 3

Chapter 6 Notes - Communication, Integration & Homeostasis (Signaling)

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online