Neurons have the role of conducting excitation and whatever

a) Characteristics of nerve fiber conduction excitation.

1.Integrity: Nerve fibers can only conduct excitation when they are structurally and functionally intact.

2.Insulating: nerve fibers conduct excitation without interfering with each other.

3.Bidirectionality: Excitation conduction on nerve fibers is carried along the fibers to both ends.

4.Relatively non-fatigue: nerve fibers maintain the ability to conduct excitation at all times. However, synaptic transmission is easily fatigued, which may be related to transmitter depletion.

b) Characteristics of central excitatory transmission.

1.Unidirectional propagation: During reflex activity, excitation is chemically transmitted by synapses and can only be transmitted from the presynaptic terminal to the postsynaptic neuron.

2.Central delay: It takes a long time for excitation to propagate in the center because chemical synaptic transmission involves the release of transmitters from the anterior membrane, the diffusion of the transmitter in the interstitial space and the action of the receptors in the posterior membrane, and the opening of ion channels in the posterior membrane.

3.Sum of excitation: In reflex activity, the afferent impulse of a single nerve fiber generally does not cause the center to send out an efferent effect, and the afferent impulse of several nerve fibers needs to reach the same center at the same time or almost simultaneously to produce the efferent effect.

4.Changes in excitatory rhythm: because postsynaptic neurons often receive synaptic transmission from multiple presynaptic neurons at the same time, the functional states of postsynaptic neurons are different, and the reflex center is replaced by multiple intermediate neurons.

5.Easy fatigue: Synaptic transmission is relatively easy to fatigue compared to nerve fiber conduction.

Neurons have the function of conducting excitation and sensing by the central nervous system.

The process of transmission of excitation between neurons is through.

Electrical signals—chemical signals (neurotransmitters)—The characteristic of the way electrical signals are transmitted is that the direction of conduction is unidirectional.

It can only be transmitted by the synapse through the presynaptic membrane-synaptic cleft-postsynaptic membrane to the next neuron, but the conduction of excitation in the nerve fiber is bidirectional.

Excitation is transmitted between neurons in the form of chemical signals; Synapses are divided into presynaptic membrane, synaptic cleft, and postsynaptic membrane; When released into the space, the neurotransmitter moves towards the posterior membrane, recognizing and binding to specific receptors on the posterior membrane, triggering excitation or inhibition of the latter neuron.

Delivered as a chemical, slower than intraneuronal, directed (from the presynaptic membrane-> postsynaptic membrane).

Nerve impulses-> axon terminals-> synaptic vesicles release neurotransmitters-> neurotransmitters that diffuse through the synaptic cleft-> neurotransmitters bind to specific receptors on the postsynaptic membrane > cause the next neuron to excite.

Only A can be selected.

The direction in which excitation is transmitted on the first neuron is the cell body axon.

It can then make contact with the cell body or dendrites of the next neuron.

So is the cell body axon dendrites,

A nerve impulse on a cell body can only travel through axons to the cell body or dendrites of the next cell.

What conclusions can you draw from experiments on the conduction of excitation on nerve fibers.

The connection is not to say, but it can only be said that the excitement is transmitted in the form of electrical signals on the nerve fibers. In neurons, electrical signals are converted into chemical signals that are then converted into electrical signals to the next nerve fiber, where synaptic vesicles pass through the presynaptic membrane, synaptic cleft, and postsynaptic membrane in a endocytosis and exocytosis manner.

Neuronal transmission (excitation) enables neurotransmitters to act as messengers, including: acetylcholine is synthesized from acetylcholine and acetyl-coase, and monoamines are epinephrine and norepinephrine.

Receptor breakdown will not be involved. Everything else. Nerve impulses are alternating electrical changes and chemical changes, so a pair.

Receptors do not break down, and neurons are able to transmit information (excitation) between neurons by enabling neurotransmitters to act as messengers, including: acetylcholine is synthesized by acetylcholine and acetyl-coase, and monoamines are epinephrine and norepinephrine.

Neurotransmitters are indispensable!

Receptor breakdown will not be involved. Everything else. Nerve impulses are alternating electrical changes and chemical changes, so a pair. And the receptor doesn't break down, the neurotransmitter upstairs is a ligand, not a receptor...