BIO304 FINAL TERM TEST I STUFF Flashcards
What is a Nervous System?
system of cells (neurons) capable of receiving + transmitting info
Is a brain required?
NO.
- many invertebrates lack neural structures
What is a nerve net?
Instead of a brain, jellyfish + sea anemones have these nerve nets that work efficiently to mediate behavior + respond to envrionmental queues
*its just a “non-brain” for invertebrates
What are neurons?
Cells that can generate electrical impulses
Can bacteria and plant cells generate electrical impulses?
Yes
Sites of Cell-Cell contact that allow chemical communication b/w cells.
Synapses
TRUE OR FALSE? Did synaptic genes emerge before animals in prokaryotes?
FALSE
They emegered before animals in SINGLE CELLS EUKARYOTES
What’s a placozoan?
A type of animal that lacks synapses + “A Nervous System”
What are Receptor Cells + Function?
R Cells are in the retina
- have “photoreceptors” that detect the light to trigger a change in voltage across cell membrane
- LIGHT IS CONVERTED INTO ELECTRICAL SIGNAL HERE
What Synapses?
An electrical signal comes here, and triggers neurotransmitters that are released to bind onto neurotrans receptors on post-synaptic bipolar cells
- ELECTRICAL SIGNALS ARE CONVERTED INTO CHEMICAL SIGNALS
What produces graded electrical responses in the nervous system?
The Neurotransmitter Receptors on Bipolar Cells
Action Potentials
-all or none electrical responses that travel very fast along axons
Graded Potentials
- builds up/ depolarization.
- fizzle out over time
EPSPs
graded potential thats excitatory AKA DEPOLARIZING
IPSP
graded potential that inhibitory AKA hypoerpolarizing
