A Level Biology Flipped Learning: Neurones
Cell body: The cell body, also called the soma, is the spherical part of
the neuron that contains the nucleus. The cell body connects to the The myelin sheath around most vertebrate axons
dendrites, which bring information to the neuron, and produces layer of insulation that prevents the loss of the
neurotransmitters. signal from an action potential. Myelin is
substance that does not conduct electricity well. B
Dendrites: A short branched extension of a nerve cell, along which
impulses received from other cells at synapses are transmitted to the
the insulation provided by the myelin, action pot
cell body travel much more rapidly down myelinated a
down unmyelinated axons. Myelin also isolates a
Myelin sheath: The insulating envelope of myelin that surrounds the one another in the white matter of the brain prev
core of a nerve fibre or axon and that facilitates the transmission of short-circuiting of nerve signals in the centra
nerve impulses system.
Axon: An axon is a long, slender projection of a nerve cell, or neuron
that typically conducts electrical impulses away from the neuron's cell
body
Dendron: These are single, elongated nerve fibres that transmit
impulses away from the nerve body.
Node of Ranvier: Nodes of Ranvier, also known as myelin sheath gaps,
are periodic gaps in the insulating myelin sheaths of myelinated axons
where the axonal membrane is exposed to the extracellular space
, A Level Biology Flipped Learning: Sensory
Neurones
1. At rest, the nerve ending within the Pacinian
corpuscle maintains a resting potential of −70
mV, typical of the membrane of a neurone.
When localised, strong pressure is applied to a
Pacinian corpuscle it causes the layers of
collagen of the capsule to be deformed.
2. The outcome is a temporary change to the
permeability of the membrane at the nerve
ending.
3. Sodium ions flow in, the membrane is
depolarised and the interior starts to become
less negative. The stronger the stimulus, the
greater the depolarisation.
4. If a threshold value is reached, it triggers an
impulse in the sensory neurone that serves the
sense cell.
Cell body: The cell body, also called the soma, is the spherical part of
the neuron that contains the nucleus. The cell body connects to the The myelin sheath around most vertebrate axons
dendrites, which bring information to the neuron, and produces layer of insulation that prevents the loss of the
neurotransmitters. signal from an action potential. Myelin is
substance that does not conduct electricity well. B
Dendrites: A short branched extension of a nerve cell, along which
impulses received from other cells at synapses are transmitted to the
the insulation provided by the myelin, action pot
cell body travel much more rapidly down myelinated a
down unmyelinated axons. Myelin also isolates a
Myelin sheath: The insulating envelope of myelin that surrounds the one another in the white matter of the brain prev
core of a nerve fibre or axon and that facilitates the transmission of short-circuiting of nerve signals in the centra
nerve impulses system.
Axon: An axon is a long, slender projection of a nerve cell, or neuron
that typically conducts electrical impulses away from the neuron's cell
body
Dendron: These are single, elongated nerve fibres that transmit
impulses away from the nerve body.
Node of Ranvier: Nodes of Ranvier, also known as myelin sheath gaps,
are periodic gaps in the insulating myelin sheaths of myelinated axons
where the axonal membrane is exposed to the extracellular space
, A Level Biology Flipped Learning: Sensory
Neurones
1. At rest, the nerve ending within the Pacinian
corpuscle maintains a resting potential of −70
mV, typical of the membrane of a neurone.
When localised, strong pressure is applied to a
Pacinian corpuscle it causes the layers of
collagen of the capsule to be deformed.
2. The outcome is a temporary change to the
permeability of the membrane at the nerve
ending.
3. Sodium ions flow in, the membrane is
depolarised and the interior starts to become
less negative. The stronger the stimulus, the
greater the depolarisation.
4. If a threshold value is reached, it triggers an
impulse in the sensory neurone that serves the
sense cell.
