Electric signals in animals

19 important questions on Electric signals in animals

Where does processing of information takes place?

in simple clusters of neurons called ganglia or a more complex organization of neurons called a brain.

What is the axon hillock?

the cone-shaped base of an axon.

What is a neurotranmitter?

the synaptic terminal of one axon passes information across the synapse in the form of chemical messengers.
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In which three stages does the nervous systems process information?

sensory input, integration, and motor output.

Where consists the complex nervous system from many animals of?

-central nervous system (CNS): where intergration take place; this includes the brain and an nerve cord.
- peripheral nervous system (PNS): which carries information into and out of the CNS
the neurons of the PNS, when bundled together, from nerves.

How is the K+ and Na+ gradiens maintain across the plasma membrane?

with an sodium-potassium pumps that uses the energy of ATP.

How is the chemical potential convert into electricel potential?

by opening of ion channels in the plasma membrane.

What is graded potentials?

are changes in polarization where the magnitude of the change varies with the strength of the stimulus. (not nerve signals that travel along axons).

How does an action potential arise?

because some ion channals are voltagegated, opening or closing when the membrane potential passes a certain level.

When does the speed of an action potential increases?

if the diameter of an axon is increased. for example as an axons is insulated by a myelin sheath.

What happens at an electrical synapses?

the electrical current flows from neuron to another trough gap jucntions.

How does the presynaptic neuron synthesizes and packages the neurotransmitter?

packaged into synaptic vesicles (synaptic terminal).
action potential causes the release of the neurotransmitter.
the neurotransmitter diffuse across the synaptic cleft and is received by the postsynaptic cell

How is a postsynaptic potential generated?

-direct synaptic transmission involves binding of neurotransmitters to ligand-gated ionchannels in the postsynaptic cell
-Neurotransmitter binding causes ion channels to open, generating a postsynaptic potential

In which two categories falls a postsynaptic potentials?

excitatory postsynaptic potentials (EPSPs) are depolarizations that bring the membrane potential toward treshold.
inhibitory postsynaptic potentials (IPSPs) are hyperpolarizations that move the membrane potential farther from threshold.

What happens in spatial summation?

EPSPs produced nearly siultaneously by different synapses on the same postsynaptic neuron add together.

Which two major classes of acetylcholine does vertbrates have?

ligand gated and metabotropic

Which classes of neurotransmitter do we have?

amino acids, biogenic amines, neuropeptides and gases.

What kind of amino acids are functioned in the CNS?

glutamate
gamma-aminobutyric acid (GABA)
glycine

What kind of biogenic amines are included

epinephrine
norepinephrine
dopamine
serotonin
active in the CNS and PNS

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