04-HormonesS11b - Hormones & Homeostasis Lecture...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 11/Chapter 9 & 46
Background image of page 1

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

View Full DocumentRight Arrow Icon
Homeostasis( (— A • “ & multicellularity ( — A • “ T Homeostasis : maintaining a constant internal environment of the organism interact with environment can respond to changes but return to ±normal” can operate in a broad range of conditions Part of homeostasis is getting individual cells to act as a unit (tissues or organs) Coordinate growth, position, movement, function Each cell influences cells around them²no cell act alone (under normal conditions) 2
Background image of page 2
Cellular communication To accomplish homeostasis and multicellular unity, cells must communicate Communication accomplished through: an interplay of direct contact, , , endocrine and neuronal, signaling 3 Figure 46.1
Background image of page 3

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

View Full DocumentRight Arrow Icon
Autocrine signaling Autocrine signaling : a cell regulating its own fate and function Communication between organelles Signaling molecule = autocrine regulator Influence of autocrine signals can be overwhelmed by signals from elsewhere 4
Background image of page 4
Direct contact Direct contact : cells communicate by direct touching molecules on adjacent cells Signaling molecule = membrane- bound receptors 5 See also Figure 9.2
Background image of page 5

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

View Full DocumentRight Arrow Icon
Paracrine signaling Paracrine signaling : signal released from a cell has an effect on nearby cells Diffuse through the extracellular matrix Signaling molecule = paracrine regulators 6 Figure 9.2
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/29/2011 for the course BIO 110 taught by Professor Bos during the Spring '10 term at Purdue University-West Lafayette.

Page1 / 21

04-HormonesS11b - Hormones & Homeostasis Lecture...

This preview shows document pages 1 - 7. Sign up to view the full document.

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