endocrine, immune, & nervous systems homeostasis through feedback
TRANSCRIPT
endocrine, immune, & nervous systems
Homeostasis through Feedback
Feedback MechanismsLiving organisms use biochemical pathways
in response to environmental conditions in order to maintain a constant internal environment
Maintaining HomeostasisInvolves communication between cells
Single-celled communication http://
www.ted.com/talks/bonnie_bassler_on_how_bacteria_communicate?language=en
Multicellular communicationImmune System: 43Nervous System: 48-50Endocrine System: 45
Positive Feedback Ex: Oxytocin
Negative Feedback Ex: Insulin
Immune System
Kurzgesagthttps://
www.youtube.com/watch?v=zQGOcOUBi6s
Life relentlessly attempts to murder you
Your ninja cells fight back
Contact CommunicationCells pass messages directly to each other
Plant cells Animal cells
Nonspecific (innate) ImmunityDefenses that activate immediately upon
infection
PlantsOrganism Barrier: barkCellular: cellulose cell wallMolecular: terpenoids, phenolics, alkaloids
InvertebratesOrganism Barrier: Chitinous exoskeletonCellular: Hemocytes ingest bacteriaMolecular: Lysozyme enzymes break cell
walls
VertebratesOrganism Barrier: SkinCellular: Neutrophils and macrophagesMolecular: Interferon & 30 protein
complement system
Inflammatory responseHistamine and citokine signals trigger
capillaries to dilate
Specific (adaptive) ImmunityVertebrate defenses remembered after
initial exposures
Bozemanhttps://
www.youtube.com/watch?v=z3M0vU3Dv8E
The lights are on, but nobody’s home
Nervous System
Crash Coursehttps://
www.youtube.com/watch?v=x4PPZCLnVkA
Neuron Structure & Function
Action Potential
Action Potential
Using chemistry to trick biology
Beta-endorphins
Caffeine
Tetrahydrocannabinol
Tetrodotoxins
Action Potential Animationhttp://highered.mheducation.com/sites/007
2495855/student_view0/chapter14/animation__the_nerve_impulse.html
Endocrine System
Endocrine Systemhttp://
www.dnatube.com/video/1113/The-Endocrine-System-How-it-Functions
Long Distance Communication
SignalsMolecules produced by endocrine cellsTypically travel through circulatory system
Example: Insulin
Ex: Human Growth Hormone
By understanding this systemMedicine:
Birth controlDepressionBlood pressureMetabolism