Explain how an electrical impulse is propagated along a neuron. How does an EMG signal show the intensity of muscle activation? Why does this happen? Explain how the sympathetic and parasympathetic nervous systems alter the rate of the SA node depolarization. ...
If an axon had a conduction velocity of 115 m/sec, how long would it take for an action potential to travel along this axon if it was 1520 mm long? What is the difference between efferent and afferent nerves? How is the action potential of a neuron affected in multiple sclerosis? What ...
For an action potential to communicate information to another neuron, it must travel along the axon and reach the axon terminals where it can initiate neurotransmitter release. The speed of conduction of an action potential along an axon is influenced by both the diameter of the axon and the ax...
In myelinated nerve fibre, impulseconduction is carried from node to node. In unmyelinated nerve fibre impulse conduction carried along the length of axon. In myelinated nerve fibre, action potential propagation requires activation of voltage gated Sodium channels only in nodal spaces. Where are Un...
Depending upon the type of neuron, axons can be covered with a thin layer of myelin, like an insulated electrical wire. Myelin is made of fat, and it helps to speed transmission of a nerve impulse down a long axon. Myelinated neurons are typically found in the peripheral nerves (sensory...
Not all of the serotonin will be taken into the second neuron. The remainder, along with what's released from the postsynaptic neuron after use, floats within the space between the two -- called the synaptic cleft -- until enzymes destroy it. Some of the released serotonin is also re...
Thus, the action potential (nerve impulse or nerve signal) gets transmitted (propagated) down the nerve cell. There are a few things to note about the propagation of the action potential. When an area has been depolarized and repolarized and the action potential has moved on to the ...
However, addictive substances like alcohol and drugs of abuse can overwhelm the natural reward pathways in your brain, resulting in intolerable cravings and reduced impulse control. A popular misconception is that addiction is a result of low willpower. However, an explosion of knowledge and ...
signals travel along nerves. Electrodes are placed on the skin over a nerve, and then a small electric shock is sent through the area. The mild shock stimulates motor and sensory nerves. How much of the electrical impulse reaches the nerve is recorded, as well as how fast the signals move...
that is inert until UV light hits it. Then, they pulsed laser light at a neuron, making the chemical active, which excites thenerve cellsto generate anelectrical impulse. They then tracked the spread of the impulse to adjacent cells, allowing them to map the network a neuron at a time. ...