Chemical signals in animals
Keywords Reading Ch. 45
Chemical signals outside of organisms
Pheromone
Rattlesnakes (research of Dr. Ken Kardong Zoology WSU)
Will focus on chemical signals inside organisms
Endocrine system definition
Types of signaling in endocrine system
Hormones act on specific target cells in two ways
Surface receptor - often amino acid derived hormone
Internal receptor - often steroid hormones
Action of steroids
Two specific examples of hormone action
Glucose homeostasis
PPT Slide
High blood glucose causes beta cells to release insulin
Summary
What happens if you need to increase blood glucose?
Low blood glucose causes alpha cells to release the hormone glucagon
Glucogon stimulates the liver to break down glycogen releasing glucose
Diabetes mellitus
Stress and the adrenal gland
Short-term stress: medulla of the adrenal gland
Some effects of epinephrine and norepinephrine
Example of:
Long-term stress: cortex of the adrenal gland
Corticosteroids (mineral- and gluco- corticoids) released by adrenal cortex
Email: rlee@mail.wsu.edu
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