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Does saltatory conduction only occur in CNS?
Saltory conduction only occurs in the myelinated axons.
Radiation is the only type of heat transfer that can occur?
Radiation is the only type of heat transfer that can occur through vacuum (space with no particles).
What are the only neurons of cerebellar cortex that send their axons outside of cerebellar cortex?
purkinje cells
Which tissue is reinforced by white fibers only?
Myelinated axons in the central and peripheral nervous systems.
Dendrites conduct both graded and action potential?
no, dendrites and cell bodies can only have graded potential. action potential only occurs in axons
Does saltatory conduction only occur in CNS?
Saltory conduction only occurs in the myelinated axons.
When does saltatory conduction occur?
Saltatory Conduction is a means by which action potentials are transmitted along myelinated nerve fibers. The cytoplasm of an axon is electrically conduction and because myelin inhibits charge leakage through the membrane, depolarization at one node of Ranvier is sufficient to elevate the voltage at a neighboring node to the threshold for action potential initiation. Therefore in myelinated axons, instead of axon propagating as waves but they occur at successive nodes and 'hop' along the axon. This means of travel is much faster than they would otherwise (120 m/sec compared to 35m/sec in unmyelinated nerve fibers). Another advantage of this is that energy is saved as sodium potassium pumps are only required at specific points along the axon. Sean Sinclair
Is saltatory conduction faster than conduction on an unmyelinated fiber?
wherever the Schwann cells wrap around the axon, the sodium and potassium ions cannot cross the membrane; the Schwann cells wrap too tightly around the axonal membrane for there to be any extracellular space underneath them. Therefore, the only place that an action potential can occur is at the node of Ranvier-- the space between the Schwann cells. Because of this, the action potential seems to jump from node to node along the axon. "Jumping" is what the word "saltatory" means.
What are the factors which affect the nerve conduction velocity?
The factors affecting nerve conduction velocity are as follows:(i) Axon diameter:An axon with a larger diameter conducts faster. In an unmyelinated fiber, the speed of propagation is directly proportional to the square root of the fiber diameter (D), i.e.,Conduction velocity a D(ii) Myelination and saltatory conduction:Myelination speeds up conduction. Thus, the action potential travels electrotonically along the long myelinated segments, and fresh action potentials are generated only at the nodes. This is called saltatory conduction. In a myelinated neuron, the conduction velocity is directly proportional to the fiber diameter (D).(iii) Temperature:A decrease in temperature slows down conduction velocity, (iv) Resting membrane potential. Effect of RMP changes on conduction velocity is quite variable. Usually, any change in the RMP in either direction (hyper polarization or depolarization) slows down the conduction velocity.
Radiation is the only type of heat transfer that can occur?
Radiation is the only type of heat transfer that can occur through vacuum (space with no particles).
How does conduction worrk?
Conduction can only occur in solids. Good conductors are metal, for example. In conduction, there is a heat source. The heat will heat up one part of the solid. As a result, the particles vibrate voilently. Then, the vibrating particles will make particles next to them vibrate and so on...
What are the main factys of conduction?
Thermal conduction is the transfer of heat energy through particles in contact with one another. Because heat energy is essentially kinetic energy, the particle with more kinetic energy collides with the particle with less kinetic energy, speeding it up and therefore causing it to absorb some of the heat energy from the first particle.
Does conduction only occur between solids?
No. example: liquids can be added to other liquids to cool off one another. Think cream in coffee.
What is the only way heat travels through a vacuum?
by radiation - convection and conduction cannot occur in a vacuum!
Can a neuron have multiple axons?
No, each neuron has only one axon, but has multiple dendrites so it can receive information from multiple axons from other multiple neurons.
Spinal nerve roots which contain only motor neuron axons?
the what? root of a spinal nerve consists of motor neuron axons
How is heat transfer by radiation different form heat transfer by convection and conduction?
Radiation requires neither contact (through which conduction transfers heat) nor mass flow or movement (through which convection transfers heat). Only radiation can take place in a vacuum. Convection and conduction both require a material medium for the heat transfer to occur. Only radiation can transfer thermal energy through the vacuum of space.
