The Nervous System
... • Membrane potentials arise from differences in ion concentrations between a cell’s contents and the extracellular fluid. • An action potential is an all-or-none change in the membrane potential. • Action potentials travel along an axon because they are self-propagating. • Chemical or electrical com ...
... • Membrane potentials arise from differences in ion concentrations between a cell’s contents and the extracellular fluid. • An action potential is an all-or-none change in the membrane potential. • Action potentials travel along an axon because they are self-propagating. • Chemical or electrical com ...
Chapter 3
... – surround cell bodies of PNS ganglia – provide structural support – regulate exchange of materials btwn neurons & ISF ...
... – surround cell bodies of PNS ganglia – provide structural support – regulate exchange of materials btwn neurons & ISF ...
The Nervous System
... The Nature of Nerve Signals Galvani (18th century)—discovered that frog muscle cells produce electricity Helmholtz (19th century)—found electrical activity of nerve cells carries signals from one end of a cell to the other end and from cell to cell ...
... The Nature of Nerve Signals Galvani (18th century)—discovered that frog muscle cells produce electricity Helmholtz (19th century)—found electrical activity of nerve cells carries signals from one end of a cell to the other end and from cell to cell ...
Nervous System Histology
... – Endoneurium—loose connective tissue that encloses axons and their myelin sheaths – Perineurium—coarse connective tissue that bundles fibers into fascicles – Epineurium—tough fibrous sheath around a nerve ...
... – Endoneurium—loose connective tissue that encloses axons and their myelin sheaths – Perineurium—coarse connective tissue that bundles fibers into fascicles – Epineurium—tough fibrous sheath around a nerve ...
Topic 21: COMMUNICATION BETWEEN CELLS
... passive, voltage-gated & chemically-gated channels ( ca., voltage-gated K+channel) Excitation (fig. 48.8)- a neuron receives some kind of stimulus (chemical, electrical, mechanical) usually in the dendritic region or soma. This causes the membrane potential to become less negative (called a depolari ...
... passive, voltage-gated & chemically-gated channels ( ca., voltage-gated K+channel) Excitation (fig. 48.8)- a neuron receives some kind of stimulus (chemical, electrical, mechanical) usually in the dendritic region or soma. This causes the membrane potential to become less negative (called a depolari ...
Neurons Notes
... - axon - the extension of a neuron that carries information (electrical impulses called action potentials) away from the cell body - can be very long, projecting several feet through the body - myelin sheath - a layer of white, fatty tissue segmentally encasing the axons of neurons; enables vastly g ...
... - axon - the extension of a neuron that carries information (electrical impulses called action potentials) away from the cell body - can be very long, projecting several feet through the body - myelin sheath - a layer of white, fatty tissue segmentally encasing the axons of neurons; enables vastly g ...
File
... - axon - the extension of a neuron that carries information (electrical impulses called action potentials) away from the cell body - can be very long, projecting several feet through the body - myelin sheath - a layer of white, fatty tissue segmentally encasing the axons of neurons; enables vastly g ...
... - axon - the extension of a neuron that carries information (electrical impulses called action potentials) away from the cell body - can be very long, projecting several feet through the body - myelin sheath - a layer of white, fatty tissue segmentally encasing the axons of neurons; enables vastly g ...
V m
... Concentration gradient equal to electrostatic gradient. *No net movement at resting potential ~ ...
... Concentration gradient equal to electrostatic gradient. *No net movement at resting potential ~ ...
Answers to End-of-Chapter Questions – Brooker et al ARIS site
... neuron - A highly specialized cell that communicates with another cell of its kind and with other types of cells by electrical or chemical signals. ...
... neuron - A highly specialized cell that communicates with another cell of its kind and with other types of cells by electrical or chemical signals. ...
File
... • These knobs contain vesicles that contain neurotransmitters • Neurotransmitters are chemical messengers that send information across the synapse to another neuron ...
... • These knobs contain vesicles that contain neurotransmitters • Neurotransmitters are chemical messengers that send information across the synapse to another neuron ...
Nervous System
... nerves. Cranial nerves and spinal nerves and be sensory or motor. Somatic system: serves the skin, joint, and skeletal muscles. ...
... nerves. Cranial nerves and spinal nerves and be sensory or motor. Somatic system: serves the skin, joint, and skeletal muscles. ...
NeuralTissue1 241
... • Specialized cells that communicate with other cells via changes in the membrane potential and synaptic connections • Characteristics: – Extremely long-lived (> 100yrs) – Amitotic – Extremely high metabolic rate ...
... • Specialized cells that communicate with other cells via changes in the membrane potential and synaptic connections • Characteristics: – Extremely long-lived (> 100yrs) – Amitotic – Extremely high metabolic rate ...
01.22.10 Lecture 5: Membrane transport
... Ion channels have ion selectivity - they only allow passage of specific molecules ...
... Ion channels have ion selectivity - they only allow passage of specific molecules ...
CHAPTER 11 Nervous Tissue - Austin Community College
... Nerves are only in the periphery Cable-like organs in PNS = cranial and spinal nerves Consists of 100’s to 100,000’s of myelinated and unmyelinated axons (nerve fibers). Endoneurium surrounds each axon (nerve fiber). Axons are grouped into bundles of fascicles Perineurium surrounds each fascicle Epi ...
... Nerves are only in the periphery Cable-like organs in PNS = cranial and spinal nerves Consists of 100’s to 100,000’s of myelinated and unmyelinated axons (nerve fibers). Endoneurium surrounds each axon (nerve fiber). Axons are grouped into bundles of fascicles Perineurium surrounds each fascicle Epi ...
MEMBRANE POTENTIALS
... Resting membrane pot. ~ -70 mV Action pot. (“spike”) ~ +40 mV (all-or-none) Threshold ~ -60 mV ...
... Resting membrane pot. ~ -70 mV Action pot. (“spike”) ~ +40 mV (all-or-none) Threshold ~ -60 mV ...
Nerve Impulses
... The action potential causes voltage gated channels to open in adjacent areas of the axon membrane causing the action potential to move down the length of the axon. ...
... The action potential causes voltage gated channels to open in adjacent areas of the axon membrane causing the action potential to move down the length of the axon. ...
Lecture 1, Chapter 1 Overview: History and the neuron
... Hodgkin and Katz (1949) Working with giant squids can lead to problems “The values for spike height are in good agreement with those obtained by Hodgkin and Huxley (1945), but are considerably smaller than those reported by Curtis and Cole (1942). The average value for the resting potential is sligh ...
... Hodgkin and Katz (1949) Working with giant squids can lead to problems “The values for spike height are in good agreement with those obtained by Hodgkin and Huxley (1945), but are considerably smaller than those reported by Curtis and Cole (1942). The average value for the resting potential is sligh ...
Nervous and Immune Systems
... 2. Sodium ions (Na+) rush into the axon causing depolarization in the neuron and initiating an action potential 3. Depolarization moves down the axon causing more voltage-gated sodium channels to open 4. Another action potential occurs further down the axon resulting in the transmission of the signa ...
... 2. Sodium ions (Na+) rush into the axon causing depolarization in the neuron and initiating an action potential 3. Depolarization moves down the axon causing more voltage-gated sodium channels to open 4. Another action potential occurs further down the axon resulting in the transmission of the signa ...
Neurons - E-Learning/An-Najah National University
... Neurons, also called nerve cells, are highly specialized to transmit messages (nerve impulses) from one part of the body to another. Although neurons differ structurally, they have many common features (Figure 7.4). All have a cell body, which contains the nucleus and is the metabolic center of the ...
... Neurons, also called nerve cells, are highly specialized to transmit messages (nerve impulses) from one part of the body to another. Although neurons differ structurally, they have many common features (Figure 7.4). All have a cell body, which contains the nucleus and is the metabolic center of the ...
Exam 1 suggested answers (2010)
... 4.a. Expose the developing organism to an altered DNA nucleotide such as tritiated thymidine or bromodeoxyuridine at different developmental stages. Later locate cells containing the altered nucleotide; these cells must have been still dividing at the time of exposure to label; unlabelled cells must ...
... 4.a. Expose the developing organism to an altered DNA nucleotide such as tritiated thymidine or bromodeoxyuridine at different developmental stages. Later locate cells containing the altered nucleotide; these cells must have been still dividing at the time of exposure to label; unlabelled cells must ...
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.