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Which type of axon will velocity of action potential conduction be the fastest?
Myelinated axons with the largest diameter
What type of axon allows saltatory conduction?
A myelinated axon
What structure in the neuron helps to speed up the transmission of the action potential?
To speed up transmission of the action potential from where it originates (axon hillock) to where it ends (axon terminal), the action potential propagates by 'saltatory conduction' - and the structure that makes this possible is the insulating layer of myelin sheath that wraps around the axon, arranged in 'nodes' along its length. Technically, it's the gaps between the nodes (nodes of Ranvier) that cause the action to continually propagate and maintain its fast conduction velocity.
What influences the speed of a nerve impulse?
the diameter of an axon
What is occurring between the dendritic end and the axon hillock?
conduction and summation of graded potentials.
Which type of axon will velocity of action potential conduction be the fastest?
Myelinated axons with the largest diameter
A factor that determines the rate of impulse propagation or conduction velocity along an axon?
The speed at which neural impulses are transmitted. Diameter of the axon Degree of myelination of the axon
What is the relationship between size of nerve and conduction velocity?
For unmyelinated nerves there is a relationship between axon diameter and conduction velocity. Larger diameter nerves conduct faster. For myelinated nerves the a larger diameter nerve will conduct faster between the nodes of ranvier where the action potential is propagated. Conduction is said to be saltatoryas it jumps from node to node.
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.
What are two properties determine the conduction velocity in a mammalian neuron?
Axon diameter and the leak resistance of the membrane. You're welcome Physio students.
Does the presence of the nodes of ranvier speed up velocity of conduction along the axon?
True
What would be the effect on action potential conduction at a region of axon where the disease had its effect?
Depends on disease
What type of axon allows saltatory conduction?
A myelinated axon
How fast do brainwaves travel?
The fastest nerve conducts an impulse at 120 metres per second. However transmission speed is related to diameter, and so nerves with a smaller diameter conduct impulses at a much slower speed. In general, the conduction velocity is approximately equal to 6 x axon diameter in micrometres. The constant value of 6 is referred to as the Hursh factor.
Conduction along a myelinated axon is called?
It is called saltatory conduction. This describes the "jumping" of an action potential from node to node on a myelinated axon.
What type of conduction takes in unmyelinated axon?
continuous
What structure in the neuron helps to speed up the transmission of the action potential?
To speed up transmission of the action potential from where it originates (axon hillock) to where it ends (axon terminal), the action potential propagates by 'saltatory conduction' - and the structure that makes this possible is the insulating layer of myelin sheath that wraps around the axon, arranged in 'nodes' along its length. Technically, it's the gaps between the nodes (nodes of Ranvier) that cause the action to continually propagate and maintain its fast conduction velocity.
