Question

Why some neurons have myeline sheath and some do not?

Answer 1

Answer:

• ɴᴇᴜʀᴏɴs ᴜsᴜᴀʟʟʏ ʜᴀᴠᴇ ᴏɴᴇ ᴏʀ ᴛᴡᴏ ᴀxᴏɴs, ʙᴜᴛ sᴏᴍᴇ ɴᴇᴜʀᴏɴs, ʟɪᴋᴇ ᴀᴍᴀᴄʀɪɴᴇ ᴄᴇʟʟs ɪɴ ᴛʜᴇ ʀᴇᴛɪɴᴀ, ᴅᴏ ɴᴏᴛ ᴄᴏɴᴛᴀɪɴ ᴀɴʏ ᴀxᴏɴs. sᴏᴍᴇ ᴀxᴏɴs ᴀʀᴇ ᴄᴏᴠᴇʀᴇᴅ ᴡɪᴛʜ ᴍʏᴇʟɪɴ, ᴡʜɪᴄʜ ᴀᴄᴛs ᴀs ᴀɴ ɪɴsᴜʟᴀᴛᴏʀ ᴛᴏ ᴍɪɴɪᴍɪᴢᴇ ᴅɪssɪᴘᴀᴛɪᴏɴ ᴏғ ᴛʜᴇ ᴇʟᴇᴄᴛʀɪᴄᴀʟ sɪɢɴᴀʟ ᴀs ɪᴛ ᴛʀᴀᴠᴇʟs ᴅᴏᴡɴ ᴛʜᴇ ᴀxᴏɴ, ɢʀᴇᴀᴛʟʏ ɪɴᴄʀᴇᴀsɪɴɢ ᴛʜᴇ sᴘᴇᴇᴅ ᴏɴ ᴄᴏɴᴅᴜᴄᴛɪᴏɴ.

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Answer 2

Explanation:

ItsSamGupta

• Neurons usually have one or two axons, but some neurons, like amacrine cells in the retina, do not contain any axons. Some axons are covered with myelin, which acts as an insulator to minimize dissipation of the electrical signal as it travels down the axon, greatly increasing the speed on conduction