Zusammenfassung der Ressource
Response to Stimuli
- Experimental method
- Animal
- Stimulus Response Model
- Stimulus
- Sensory Receptors
- Affectors
- Thermoreceptros
- Eternal and Internal environmental factors
- Physical and Chemical
- Detection
- Response
- Receptors
- Negative feedback (reduces stimulus back to acceptable limits)
- as opposed to positive feedback which increases stimuli until task is comlete (unstable-doesn't add homeostaisi
- Plant
- Hormone/growth regulators
- Types of hormones
- Auxin
- Transport
- Vascular System
- Xylem
- Phloem
- Through the air
- Ethylene
- Diffusion through the cell
- Trophism
- Growth Response
- Phototropism
- Light
- Apical tip
- Zone of elongation
- Meristem
- Geootropism
- Gravity
- Accumulation of auxin
- Uneven growth
- Low concentrations
auxin inhibitor
- Abscisic acid
- Thigmotropism
- Physical contact
- Uneven auxin distribution causes bending
- Temperature response
- Enzymes affected
- Dormancy
- Vernalisation
- Bacteria
- Nervous
- Signalling Molecules
- Hormonal
- Signalling Molecules
- Signal Tranduction
- Lipid soluble
- Through the membrane
- Binds with an internal receptor
- Forms a hormone-receptor complex
- Can activate or suppress the production of a protein
- Gene activation
- Transcription and translation for genes with codes for proteins
- Simple diffusion
- Examples
- Steroids
- Estrogen
- Testosterone
- Thyroid
- Derived form Thyroxine
- In blood stream
- Carrier Protein
- Allows the non polar hormone to
dissolve in polar blood plasma
- Effects
- Slower
- Completion of proteins
takes a very long time
- Long lasting
- Proteins like enzymes can be reused
- Regulates long term development
- Water soluble
- Cannot pass through the membrane
- What is it?
- Cascade of processes
- Signalling molecules
- Apoptosis
- Controlled process
- Cell Shrinkage
- Blebbing
- Loses it's shape
- Bubbles hanging off the cell
- Nuclear Fragmentation
- Chromatin Condensation
- Chromosomal DNA fragmentation
- After death engulfed by phagocytic cell