neurone

• the axon hillock is the site where action potentials are initiated
• myelinated fibres conduct at about 100m/sec
• axons have myelin sheath which insulates them, allowing faster conduction of impulses
• dendrites receive input from other cells
• in unmyelinated fibers, there is no myelin sheath so they conduct more slowly (about 2 m/sec)
• neurones communicate with one another through synapses
• presynaptic terminals contain vesicles filled with neurotransmitters
• axons transmit impulses away from cell body
• dendrites receive input from other cells, they have many branches to increase surface area
• unmyelinated fibres conduct at about 2-3 m/sec
• unmyelinated fibres conduct at around 3 m/sec
• myelinated fibres conduct at up to 120m/sec
• presynaptic terminal contains vesicles filled with neurotransmitters
• postsynaptic membrane has receptors that bind to specific neurotransmitter molecules
• neurotransmitter molecules are released into the synapse when an action potential reaches the presynaptic terminal
• neurotransmitter molecules are released into the synapse when an action potential reaches the presynaptic terminal
• these neurotransmitter molecules diffuse across the synapse to bind to receptors on postsynaptic membrane
• synapse - junctions between two nerve cells or between a nerve cell and an effector organ
• when enough neurotransmitter has bound to its receptor, it causes depolarization or hyperpolarisation of the post-synaptic cell
• postsynaptic membrane has receptors that bind to the released neurotransmitter
• postsynaptic membrane has receptors that bind to the released neurotransmitter
• these neurotransmitter molecules diffuse across the synapse to bind to receptors on postsynaptic membrane
• postsynaptic membrane - the membrane on which the presynaptic terminal makes contact
• when enough neurotransmitter has bound to its receptor, it causes depolarization or hyperpolarisation of the post-synaptic cell
• postsynaptic membrane - the membrane on which the presynaptic terminal makes contact
• the myelin sheath is made by glial cells called schwann cells
• postsynaptic membrane - the membrane on which the presynaptic terminal makes contact
• postsynaptic membrane - the membrane on which the presynaptic terminal makes contact
• myelinated fibres are faster than unmyelinated fibres as the myelin sheath insulates axon so that action potential can jump along it
• myelinated fibres are faster than unmyelinated fibres as the myelin sheath insulates axon so that action potential can jump along it
• myelinated fibres are faster than unmyelinated fibres as the myelin sheath insulates axon so that action potential can jump along it
• neurotransmitter diffuses across synapse and binds to postsynaptic receptor
• neurotransmitter - chemical released by presynaptic terminal that diffuses across gap to postsynaptic membrane
• neurotransmitter - chemical released by presynaptic terminal that diffuses across gap to postsynaptic membrane
• postsynaptic membrane - receives signals from presynaptic terminal
• neurotransmitter - chemical released by presynaptic terminal that diffuses across gap to postsynaptic membrane
• neurotransmitter - chemical released by presynaptic terminal that diffuses across gap to postsynaptic membrane
• neurotransmitter diffuses across synapse and binds to postsynaptic receptor
• postsynaptic membrane has receptors that bind to neurotransmitter
• postsynaptic membrane has receptors that bind to neurotransmitter