Hormones/Evolution/Neurodevelopment Flashcards
Endocrine Glands
Release hormones from inside the body
Exocrine Glands
Use ducts to secrete fluid outside of the body
Arnold Berthold
Demonstrated the importance of hormones for behavior.
Similarities between hormones and neurons
They receive synaptic input, reach threshold and produce action potentials
Differences between hormones and neurons
Neural messages are rapid, Hormonal are shorter.
Hormones have a longer lasting effect
Hormonal Categories
Peptide Hormones: Consist of a strong of amino acids.
Amine Hormones: Each composed of a single amino acid that has been modified into a related molecule such as melatonin
Steroid Hormones: Each of which is composed of four interconnected rings of carbon atoms
Hormones
Promote the proliferation, growth and differentiation of cells and modulate cell activity.
Second-Messenger Hormones
A slow acting substance in a target cell that amplifies the effects of synaptic or hormonal activity and regulates activity within the target cell
Cyclic AMP/cAMP
Transmits messages of many of the peptide and amine hormones.
Negative Feedback
Output of the hormone feeds back to inhibit the drive for more of that same hormone
Development of the Nervous System
Neurogenesis: the mitotic division of nonneuronal cells to produce neurons
Cell Migration: The movement of cells to establish distinct nerve cell populations
Differentiations: of cells into distinctive types of neurons
Synaptogenesis: The establishment of synaptic connections, such as axons and dendrites
Neuronal Cell Death: the selective death of many nerve cells
Synapse Rearrangement: The loss of some synapses and development of others, to refine synaptic connections