Chemical Signals in Animals: Endocrine System and Hormonal Control
Chemical Signals 2
description
Transcript of Chemical Signals 2
Chemical Signals 2
BIOL 1407
Endocrine Glands
• Hormone-secreting cells make up endocrine system
• Ductless glands• Secrete into blood• Receptors on
target cells
Hypothalamus-Pituitary Axis
Hormones Released
from Posterior Pituitary
Relationship of Hypothalamus and Anterior
PituitaryHypothalamus
Levels of T3/T4 fall below minimum range
Receptor on Hypothalamic Neuron
Example: Control of Release of T3/T4
Thyroid Gland
• Calcitonin – Ca regulation
• T3 and T4
– Metabolic rate– Other effects:
• Nervous
• Reproductive
• Muscle
• Heart & blood pressure
• Digestive system
• Development• Diagram Credit: US Government, Wikimedia Commons
T3/T4: Tadpole Metamorphosis
Control of Ecdysis
• Ecdysis in Crustacean: http://www.youtube.com/watch?v=qACc82n6ODE
• Photo Credit: Macau500, 2004, Wikimedia Commons
Brain Hormone (BH) = PTTH
(Prothoracicotropic Hormone)
The End
Unless otherwise specified, all images in this presentation came from:
Campbell, et al. 2008. Biology, 8th ed. Pearson Benjamin Cummings.