Quiz 3 Flashcards
Collateral
is a branch of an axon that terminates in another part of the nervous system from main terminal of the axon.
Neuron
Large euchromatic nucleus and a prominant nucleolus. it has lipofusion because of longevity.
What is transported within the axon?
Organelles, such as mitochondria and vesicles. Also proteins and cytoskeletal elements.
What is the general speed of fast and slow axoplasmic transport?
Slow: 0.2-4mm/day
Fast: 20-400 mm/day
What are the proteins on the presynaptic and postsynaptic membranes?
Pre - proteins required for docking/release of vesicles of neurotransmitter
Post - receptors and associated regulatory molecules and enzymes
Why do action potentials move in one direction and not “ double back” on themselves?
Absolute refractory period
What are the two broad types of receptors for neurotransmitters?
Ionotropic (ligand-gated ion channels) or metabotropic receptors (transmembrane proteins that are linked to 2nd messenger systems).
Range of conduction speeds from unmyelinated axons to the fastest myelinated axons?
from less than 1m/sec to less than 100m/sec
What are the two types of ganglia?
sensory and autonomic ganglia
What are the nervi vascularis?
Nerves that supply the blood vessels and may consist of sensory fibers and automatic nerve fibers.
Layers of the capillary
Endothelium, basement membrane and have pericyctes (contraction and regeneration of capillary bed)
Function of post-capillary venules
Gaseous\nutrient exchange and site where most WBC leave the blood stream to enter the tissue
Layers of the capillary
Endothelium, basement membrane and have pericyctes (contraction and regeneration of capillary bed)
Function of post-capillary venules
Gaseous\nurtient function
function of the endothelial cells
Prevents clots (antithrombogentic), inflaminatory response, vasoactive substances
