AP BIOLOGY

Detailed explanation-1: -A myelin sheath is a sleeve (sheath) that’s wrapped around each nerve cell (neurons). It’s a protective layer of fat (lipids) and protein that coats the main “body” section of a neuron called the axon.

Detailed explanation-2: -Are all axons covered with myelin? No; they can be either myelinated or unmyelinated. Myelinated axons are ensheathed along their entire length. The axon caliber (diameter) in mammalian PNS ranges from 0.1 m to 20 m, with unmyelinated axons being less than 2 m and myelinated axons being more than 1–2 m in diameter.

Detailed explanation-3: -An axon is insulated by a myelin sheath throughout its length to increase the velocity of these electrical signals allowing signals to propagate quickly. Axons which are covered by a myelin sheath, a multilayer of proteins and lipids, are said to be myelinated.

Detailed explanation-4: -The axon is covered by a myelin sheath. The axon passes information to the next neuron or other cell in the body. A myelin sheath. The axons have a protective covering called myelin.