Angela O'Connor

Angela O'Connor

Angela O'Connor
More ideas from Angela
Nodes of Ranvier Between areas of myelin are non-myelinated areas called the nodes of Ranvier. Because fat (myelin) acts as an insulator, membrane coated with myelin will not conduct an impulse. So, in a myelinated neuron, action potentials only occur along the nodes and, therefore, impulses 'jump' over the areas of myelin - going from node to node in a process called saltatory conduction (with the word saltatory meaning 'jumping'): http://people.eku.edu/ritchisong/301notes2.htm

Nodes of Ranvier Between areas of myelin are non-myelinated areas called the nodes of Ranvier. Because fat (myelin) acts as an insulator, membrane coated with myelin will not conduct an impulse. So, in a myelinated neuron, action potentials only occur along the nodes and, therefore, impulses 'jump' over the areas of myelin - going from node to node in a process called saltatory conduction (with the word saltatory meaning 'jumping'): http://people.eku.edu/ritchisong/301notes2.htm

Recently, someone asked me to talk about Neurotransmitters, so I am going to go back to the basics as to how neurons work, what action potentials are, how they happen, and then what neurotransmitters are and what different ones may do! Let’s begin to talk action potentials. Action potentials are how messages are carried from one neuron to the next. Neurons are specialized for this kind of signal because they have excitable membranes.

Recently, someone asked me to talk about Neurotransmitters, so I am going to go back to the basics as to how neurons work, what action potentials are, how they happen, and then what neurotransmitters are and what different ones may do! Let’s begin to talk action potentials. Action potentials are how messages are carried from one neuron to the next. Neurons are specialized for this kind of signal because they have excitable membranes.

Impulse transmission - The nerve impulse (action potential) travels down the presynaptic axon towards the synapse, where it activates voltage-gated calcium channels leading to calcium influx, which triggers the simultaneous release of neurotransmitter molecules from many synaptic vesicles by fusing the membranes of the vesicles to that of the nerve terminal. The neurotransmitter molecules diffuse across the synaptic cleft, bind briefly to receptors on the postsynaptic neuron to activate…

Impulse transmission - The nerve impulse (action potential) travels down the presynaptic axon towards the synapse, where it activates voltage-gated calcium channels leading to calcium influx, which triggers the simultaneous release of neurotransmitter molecules from many synaptic vesicles by fusing the membranes of the vesicles to that of the nerve terminal. The neurotransmitter molecules diffuse across the synaptic cleft, bind briefly to receptors on the postsynaptic neuron to activate…