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What are the 5 steps to a reflex arc?
Arrival of stimulus, Activation of a sensory neuron, Information processing by an interneuron, Activation of a motor neuron, The response by an effector. Straight out of my anatomy text book.
What are the 5 steps to a reflex?
Arrival of stimulus, Activation of a sensory neuron, Information processing by an interneuron, Activation of a motor neuron, The response by an effector. Straight out of my anatomy text book.
During an action potential, what happens to the neuron's electrical charge?
During an action potential, the neuron's electrical charge rapidly changes from negative to positive, allowing for the transmission of signals along the neuron.
What happens during an action potential in a neuron?
During an action potential in a neuron, there is a rapid change in electrical charge across the cell membrane. This change allows for the transmission of signals along the neuron.
What happens to the neuron after an action potential is fired?
After an action potential is fired, the neuron goes through a refractory period where it cannot fire another action potential immediately. During this time, the neuron resets its electrical charge and prepares for the next signal.
What is the normal order of activation in neuronal transmission?
In neuronal transmission, the normal order of activation begins with the generation of an action potential in the presynaptic neuron, typically triggered by the influx of sodium ions through voltage-gated sodium channels. This action potential travels down the axon to the axon terminals, where it stimulates the release of neurotransmitters into the synaptic cleft. The neurotransmitters then bind to receptors on the postsynaptic neuron, leading to depolarization and potentially generating an action potential in that neuron. This sequence facilitates communication between neurons in the nervous system.
What ion causes re polarization of the neuron during an action potential?
K+
Is the neuron ready to fire during the refractory period?
No, the neuron is not ready to fire during the refractory period. This period occurs immediately after the neuron has fired and is characterized by a temporary inability to generate another action potential.
When two action potentials arrive simultaneously at two different presynaptic terminals that synapse with the same postsynaptic neuron?
When two action potentials arrive simultaneously at different presynaptic terminals synapsing with the same postsynaptic neuron, the postsynaptic neuron may experience a phenomenon known as spatial summation. This occurs when the excitatory postsynaptic potentials (EPSPs) generated by each terminal combine, potentially reaching the threshold for triggering an action potential in the postsynaptic neuron. If the combined effects are sufficient, the postsynaptic neuron will fire an action potential; otherwise, it will remain at its resting potential. This process enhances the likelihood of neuronal activation in response to multiple inputs.
What is the interval called during which a neuron is dormant after an action potential has been completed?
Resting potential
An environmental stimulus acting on the body initially produces an electrical response called aan in the receptor neuron?
The electrical response in the receptor neuron is called an action potential. This action potential is generated when environmental stimuli cause depolarization of the neuron's membrane, allowing positive ions to enter and create a temporary change in electrical charge. This signal is then propagated along the neuron for further processing in the nervous system.
What happends at the synapse during the reflex?
During a reflex, the synapse serves as the critical junction where neurotransmitters are released from the presynaptic neuron, allowing communication with the postsynaptic neuron. When a sensory neuron detects a stimulus, it transmits an electrical signal to the spinal cord, where it synapses with an interneuron or motor neuron. This rapid transmission enables a quick response, often bypassing the brain for immediate action. Ultimately, the motor neuron then sends a signal to the muscles, initiating a reflexive action.
