Chapter 13
... ions than the surrounding medium The cell membrane also has 2 other separate protein channels, one that ‘leaks’ K+ ions and one that ‘leaks’ Na+ ions down their ________________________ There are more K+ channels than Na+ channels which means more K+ ions leak out of the cell as opposed to Na+ leaki ...
... ions than the surrounding medium The cell membrane also has 2 other separate protein channels, one that ‘leaks’ K+ ions and one that ‘leaks’ Na+ ions down their ________________________ There are more K+ channels than Na+ channels which means more K+ ions leak out of the cell as opposed to Na+ leaki ...
Nerve
... neuron) plus all the Schwann cells that are associated with it. In myelinated fibers, each Schwann cell forms a segment of the elaborate wrapping (the myelin sheath) that surrounds each axon individually. Unmyelinated fibers in the PNS are still associated with Schwann cells, but there are multiple ...
... neuron) plus all the Schwann cells that are associated with it. In myelinated fibers, each Schwann cell forms a segment of the elaborate wrapping (the myelin sheath) that surrounds each axon individually. Unmyelinated fibers in the PNS are still associated with Schwann cells, but there are multiple ...
Lecture #13 – Animal Nervous Systems
... along the axon by depolarizing adjacent regions of the membrane past the threshold • Depolarization zone travels in one direction only due to the refractory period (Na+ gates locked) ...
... along the axon by depolarizing adjacent regions of the membrane past the threshold • Depolarization zone travels in one direction only due to the refractory period (Na+ gates locked) ...
Lecture #13 * Animal Nervous Systems
... along the axon by depolarizing adjacent regions of the membrane past the threshold • Depolarization zone travels in one direction only due to the refractory period (Na+ gates locked) ...
... along the axon by depolarizing adjacent regions of the membrane past the threshold • Depolarization zone travels in one direction only due to the refractory period (Na+ gates locked) ...
Slide 1
... FIGURE 3.4 Left, photomicrograph from one of the Cajal’s preparations of the “occipital pole” of an eighteenday-old cat, showing the soma of a pyramidal cell (Py) and a neurogliaform cell (interneuron; Int) stained with the Golgi method. Right, the principal cellular types based on the works of Caj ...
... FIGURE 3.4 Left, photomicrograph from one of the Cajal’s preparations of the “occipital pole” of an eighteenday-old cat, showing the soma of a pyramidal cell (Py) and a neurogliaform cell (interneuron; Int) stained with the Golgi method. Right, the principal cellular types based on the works of Caj ...
New Insights into Neuron-Glia Communication
... environment shared by these two cell types. Advanced imaging methods, which allow observation of changes in intracellular and extracellular signaling molecules in real time, show that glia communicate with one another and with neurons primarily through chemical signals rather than electrical signals ...
... environment shared by these two cell types. Advanced imaging methods, which allow observation of changes in intracellular and extracellular signaling molecules in real time, show that glia communicate with one another and with neurons primarily through chemical signals rather than electrical signals ...
NERVOUS SYSTEM - Welcome to SBI4U with Ms. Taman!
... • 3-pound (1.4-kilogram) mass of jelly-like fats and tissues •Up to one trillion nerve cells work together and coordinate the physical actions and mental processes that set humans apart from other species. ...
... • 3-pound (1.4-kilogram) mass of jelly-like fats and tissues •Up to one trillion nerve cells work together and coordinate the physical actions and mental processes that set humans apart from other species. ...
Composition of the Nervous System
... a site of information processing. The organization of neuronal processes and their connections within the grey matter is termed the microcircuitry. ▪Composition of white matter (Mainly projection neurons) -Axons (myelinated and unmyelinated) -Oligodendroglia -Astrocytes (fibrous) -Capillaries some W ...
... a site of information processing. The organization of neuronal processes and their connections within the grey matter is termed the microcircuitry. ▪Composition of white matter (Mainly projection neurons) -Axons (myelinated and unmyelinated) -Oligodendroglia -Astrocytes (fibrous) -Capillaries some W ...
Neural Control II
... – Chemical synapses – electrical impulses must be converted to a chemical signal that crosses the synapse; more common in vertebrates ...
... – Chemical synapses – electrical impulses must be converted to a chemical signal that crosses the synapse; more common in vertebrates ...
Lidocaine: a Common Local Anaesthetic How does it work and how
... Figure 3: Composition of the cell wall ( is lidocaine) If we look at an expansion of (C) then we can see how the membrane that defines the surface of the cell is composed (Figure 3). It can be seen that it is a bilayer of molecules that are very polar (hydrophilic) at one end and fatty (lipophilic) ...
... Figure 3: Composition of the cell wall ( is lidocaine) If we look at an expansion of (C) then we can see how the membrane that defines the surface of the cell is composed (Figure 3). It can be seen that it is a bilayer of molecules that are very polar (hydrophilic) at one end and fatty (lipophilic) ...
Cells of the Nervous System
... outside of neurons/remove waste • surround synapses and can modify neuronal signals • send nutrients (glucose) to neurons • digest old neuronal parts • secrete neurotransmitters and glialtransmitters ...
... outside of neurons/remove waste • surround synapses and can modify neuronal signals • send nutrients (glucose) to neurons • digest old neuronal parts • secrete neurotransmitters and glialtransmitters ...
file
... Giving a patient Lithium adds even more positive ions on the outside of the nerve cell which raises the resting potential, thus making it easier to initiate an action potential (ions are even less in balance thus easier to get action potential going). The effect often makes the person more active an ...
... Giving a patient Lithium adds even more positive ions on the outside of the nerve cell which raises the resting potential, thus making it easier to initiate an action potential (ions are even less in balance thus easier to get action potential going). The effect often makes the person more active an ...
Physio study guide unit 2
... What are the three ways a channel’s conductance can change? Discuss sodium’s three gating positions. How are these gating positions involved in refractory period? What is absolute refractory period? What is relative refractory period? What is saltatory conduction (salta means “to jump”) with respect ...
... What are the three ways a channel’s conductance can change? Discuss sodium’s three gating positions. How are these gating positions involved in refractory period? What is absolute refractory period? What is relative refractory period? What is saltatory conduction (salta means “to jump”) with respect ...
a14a NeuroPhysI
... Threshold Stimulus Subthreshold stimulus—weak local depolarization that does not reach ...
... Threshold Stimulus Subthreshold stimulus—weak local depolarization that does not reach ...
Photo Album
... Ranvier (N). (Inset) An enlargement of compact myelin with alternating dark and light electron-dense lines that represent intracellular (major dense lines) and extracellular (intraperiod line) plasma membrane appositions, respectively. ...
... Ranvier (N). (Inset) An enlargement of compact myelin with alternating dark and light electron-dense lines that represent intracellular (major dense lines) and extracellular (intraperiod line) plasma membrane appositions, respectively. ...
A1982NV42600001
... in St. Louis in the spring of 1970. This encouraged my colleagues, David Cottlieb, Joel Price, and Tom Woolsey, and me, at Washington University in St. Louis, to see if the same approach could be used in other parts of the Ch~S.We began by making injections of tritium-labeled amino acids into severa ...
... in St. Louis in the spring of 1970. This encouraged my colleagues, David Cottlieb, Joel Price, and Tom Woolsey, and me, at Washington University in St. Louis, to see if the same approach could be used in other parts of the Ch~S.We began by making injections of tritium-labeled amino acids into severa ...
Ch12 notes Martini 9e
... • To return to resting state • During which membrane will not respond normally to additional stimuli • Absolute Refractory Period • Sodium channels open or inactivated • No action potential possible • Relative Refractory Period • Membrane potential almost normal • Very large stimulus can initiate ac ...
... • To return to resting state • During which membrane will not respond normally to additional stimuli • Absolute Refractory Period • Sodium channels open or inactivated • No action potential possible • Relative Refractory Period • Membrane potential almost normal • Very large stimulus can initiate ac ...
Saladin 5e Extended Outline
... d. They secrete nerve growth factors, proteins that promote neuron growth and synapse formation. e. They communicate electrically with neurons and may influence signaling. f. They regulate the chemical composition of the tissue fluid, absorbing neurotransmitters and potassium ions so that they do no ...
... d. They secrete nerve growth factors, proteins that promote neuron growth and synapse formation. e. They communicate electrically with neurons and may influence signaling. f. They regulate the chemical composition of the tissue fluid, absorbing neurotransmitters and potassium ions so that they do no ...
Neuroglia - wsscience
... Step 1: depolarization of nerve cell to threshold level. Step 2: NA+ channels open and NA+ ions enter the cell. Creates rapid depolarization. Step 3: NA+ channels close and K+ channels open. K+ ions exit the cell. This starts repolarization. Step 4: Hyperpolarization occurs because too much ...
... Step 1: depolarization of nerve cell to threshold level. Step 2: NA+ channels open and NA+ ions enter the cell. Creates rapid depolarization. Step 3: NA+ channels close and K+ channels open. K+ ions exit the cell. This starts repolarization. Step 4: Hyperpolarization occurs because too much ...
Pacemaking cells
... activation of the ventricles and is the largest deflection in the ECG. This is because the ventricles contain the largest mass of muscle cells in the heart, collectively ...
... activation of the ventricles and is the largest deflection in the ECG. This is because the ventricles contain the largest mass of muscle cells in the heart, collectively ...
PG1006 Lecture 2 Nervous Tissue 1
... of the nervous system and dis4nguish what we mean by nerves, nerve cells and neurones 2. Outline the key structural features of nerve cells or neurons 3. Introduce the methods by which neurones physica ...
... of the nervous system and dis4nguish what we mean by nerves, nerve cells and neurones 2. Outline the key structural features of nerve cells or neurons 3. Introduce the methods by which neurones physica ...
The Nervous System
... Grey matter – short neurons with unmyelinated axons. Also contains support cells (neuroglial cells). White matter – long myelinated axons with no dendrites or cell bodies. Function to connect gray matter. (Think of this as an extension cord) ...
... Grey matter – short neurons with unmyelinated axons. Also contains support cells (neuroglial cells). White matter – long myelinated axons with no dendrites or cell bodies. Function to connect gray matter. (Think of this as an extension cord) ...
Node of Ranvier
The nodes of Ranvier also known as myelin sheath gaps, are the gaps (approximately 1 micrometer in length) formed between the myelin sheaths generated by different cells. A myelin sheath is a many-layered coating, largely composed of a fatty substance called myelin, that wraps around the axon of a neuron and very efficiently insulates it. At nodes of Ranvier, the axonal membrane is uninsulated and, therefore, capable of generating electrical activity.