Question

Period. DLDE How d graded current is different from an action potential. Make sure you think about: evenirea D Percom • Where in a neuron these take place and the direction they travel. • How does the strength of the signals change as it travels • Explain any differences in the velocity (how fast) of travel 56. Describe the 3 classifications of axons based on size and velocity of propagation. 57. The release of a neurotransmitter is dependent on what ion entering the axon terminal? • What type of a channel does that ion flow through? • What caused that ion's channel to increases its permeability (to open) to allow the influx of that ion? • Why did that ion flow into the cell (what was the ion following)?

Answer 1

velocity 56. Classification of axon based on size and velocity propaga Types fiber o conduction diameter (mm) (m/sce) 12-20 70--120 5-12 30-70 15-30 3-15 0.4-12 0.5-2 AB 57. The release of neurotransmeter depeed depends on ca 2tion which entering the axon terminal • what type of channel does that in flow through a And voltage gated calcium channel helps to influx the cat in presynaptic fulminal • what caused that's ion channel to increase its permeability (to open inting to allow the of that ion , And when an action potential depolarize the presynaptic membrane, then woltage gated calcium channel open and allow large number of ca 2t to flow into the terminal. why did that in flow into the cello After reaching the action potential to presynaptic terminal the calcium channels are open and cart ion enter into terminals. After entering large quantity of ca 24 in presynaptic terminal which condensed the neurotransmeter resicle aut releasing sites. The card binds with special protein mollentes in the inside surface of the presynaptic membrane, called release site. This binding in thin causes the release site to open through the membrane, allowing vescicle to release their newrotransmeter into the synaptic cleft. -