Lecture 20, Ch. 45

Lecture 20, Ch. 45 - Lecture #20 Date _ x Chapter 45 ~...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture #20 Date _______ Chapter 45 ~ Chemical Signals in Animals
Background image of page 1

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

View Full DocumentRight Arrow Icon
Regulatory systems Hormone ~ chemical signal secreted into body fluids (blood) communicating regulatory messages Target cells ~ body cells that respond to hormones Endocrine system/glands ~ hormone secreting system/glands (ductless); exocrine glands secrete chemicals (sweat, mucus, enzymes) through ducts Neurosecretory cells ~ actual cells that secrete hormones Feedback mechanisms ~ negative and positive
Background image of page 2
Local regulators: cells adjacent to or near point of secretion Growth factors ~ proteins for cell proliferation Nitric oxide (NO) ~ neurotransmitter; cell destruction; vessel dilation Prostaglandins ~ modified fatty acids secreted by placenta and immune system; also found in semen
Background image of page 3

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

View Full DocumentRight Arrow Icon
Mode of Action: Chemical Signaling 1- Plasma membrane reception • signal-transduction pathways (neurotransmitters, growth factors, most hormones) 2- Cell nucleus reception • steroid hormones, thyroid hormones, some local regulators
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/22/2009 for the course BIOL BIOL 51 taught by Professor Janetkoprivnikar during the Spring '08 term at Pacific.

Page1 / 12

Lecture 20, Ch. 45 - Lecture #20 Date _ x Chapter 45 ~...

This preview shows document pages 1 - 5. Sign up to view the full document.

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