The fatty tissue is called the myelin sheath (or just myelin), the part of the neurone it covers is the axon.
Myelin sheath
The fatty tissue surrounding the axon of a neuron is called myelin.
enzymes
enzymes?
An enzyme is a type of protein that speeds up chemical reactions in living things by lowering the activation energy of said reactions.
In invertebrate nerves, axons and dendrites are uncovered, and signal transfer is a fairly slow process. In vertebrates, many axons and dendrites are covered in myelin, a fatty substance which insulates the nerves and speeds up conduction. However, for signal conduction to occur, ions have to be able to move in and out of the nerve along its length to transmit the impulse. Since ions can't diffuse through myelin, they have to go through the nodes of Ranvier. This is called saltatory conduct.
Myelin sheath and nodes
Impulse
it jumps over the myelin
insulating sheath that speeds up the transmission of impulses along an axon
because of material density
Waves travel at different speeds depending material density and propagation quality
No. The only thing that affects the passage of time is extreme speed, speeds very near the speed of light.
yes,it will slow down
It speeds up the pacing of a story
Yes, wave speeds are dependent on the material through which the wave is propagating. Different materials have different properties that affect how quickly a wave can travel through them. For example, sound waves travel faster in solids than in liquids or gases. Similarly, electromagnetic waves, such as light, travel at different speeds in different mediums, with the speed being fastest in a vacuum.
Temperature affects the speed of sound through material by kinetic energy. The more molecules the higher temperatures will have more energy.
This variable speed drill is for drilling different diameter chose different speeds. Workpiece material in the drill speed is important.