Capítulo 14
Canais e as Propriedades Elétricas das Membranas
Aquaporinas
Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also ...
Canais iônicos de vazamento
Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is ...
Canais Iônicos Controlados por Ligante
Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when ...
Canais Iônicos Dependente de Voltagem
Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the ...
Canais Iônicos Controlados Mecanicamente
Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, ...
Estrutura do Neurônio
Neurons are the main type of cell in the nervous system that generate and transmit electrochemical signals. They primarily communicate with each other ...
Potencial de Repouso da Membrana
The relative difference in electrical charge, or voltage, between the inside and the outside of a cell membrane, is called the membrane potential. It is ...
Decaimento do Potencial de Repouso
The resting membrane potential of a neuron (-70mV) is sustained due to the selective ion permeability of the membrane. At the resting potential, the ...
Potencial de Ação
Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of ...
Canais de Rodopsinas
Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some ...
Patch Clamp
Many fundamental cell functions such as muscle contraction and nerve transmission rely on the electrical signals produced by the movement of positively ...
Sinapses Elétricas
Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very ...
Sinapses Químicas
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because ...
Efeitos Excitatórios e Inibitórios de Neurotransmissores
When an action potential reaches the presynaptic axon terminal, it releases neurotransmitters from the neuron into the synaptic cleft at a chemical ...
Contração Muscular
In skeletal muscles, acetylcholine is released by nerve terminals at the motor endplate—the point of synaptic communication between motor neurons ...
O Papel dos Canais Iônicos na Computação Neuronal
A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates ...
Potenciação a Longo Prazo
Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the ...
Depressão a Longo Prazo
Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the ...
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