4-Taste and smell - Science-with
... /espv2/data/animals/003/index.html Click on taste sensation ...
... /espv2/data/animals/003/index.html Click on taste sensation ...
Nervous Nellie Circuit Lesson Summary: Neurons, or nerve cells
... fixed rate. This models pacemaker activity in the central nervous system. In the central nervous system, the rate of spontaneous firing of a pacemaker neuron can be modulated up and down by synaptic input. This program is not sophisticated enough to do that. Change Neuron Thresholds To activate this ...
... fixed rate. This models pacemaker activity in the central nervous system. In the central nervous system, the rate of spontaneous firing of a pacemaker neuron can be modulated up and down by synaptic input. This program is not sophisticated enough to do that. Change Neuron Thresholds To activate this ...
document
... takes 5-10 minutes to administer. It is a limited test instrument. This examination is not suitable for making a diagnosis but can be used to indicate the presence of cognitive impairment, such as when dementia or head injury are suspected. People from different cultural groups or low intelligence o ...
... takes 5-10 minutes to administer. It is a limited test instrument. This examination is not suitable for making a diagnosis but can be used to indicate the presence of cognitive impairment, such as when dementia or head injury are suspected. People from different cultural groups or low intelligence o ...
NS pdf
... membrane. Function is therefore determined by the post synaptic receptors, not by the neurotransmitter. 5. This binding opens channels in the post synaptic membrane, so Na+ moves into the post-cell and K+ moves out - temporary depolarization. 6. This causes excitation and the impulse is on its way - ...
... membrane. Function is therefore determined by the post synaptic receptors, not by the neurotransmitter. 5. This binding opens channels in the post synaptic membrane, so Na+ moves into the post-cell and K+ moves out - temporary depolarization. 6. This causes excitation and the impulse is on its way - ...
Document
... Synapses • A junction that mediates information transfer from one neuron: • To another neuron • To an effector cell ...
... Synapses • A junction that mediates information transfer from one neuron: • To another neuron • To an effector cell ...
Nervous Tissue
... This characteristic can be produced by an IPSP: a. local hyperpolarization b. decreased excitability of neuron c. increased permeability of postsynaptic membrane to K+ and Cl- ions d. all of these BACK TO GAME ...
... This characteristic can be produced by an IPSP: a. local hyperpolarization b. decreased excitability of neuron c. increased permeability of postsynaptic membrane to K+ and Cl- ions d. all of these BACK TO GAME ...
Cortex Brainstem Spinal Cord Thalamus Cerebellum Basal Ganglia
... twitch fibers contract more quickly and with greater force than slow twitch fibers but they also fatigue much more quickly than slow twitch fibers. Muscles that have predominantly fast twitch fibers are used when rapid powerful movements are required. Weight training and the use of androgenic steroi ...
... twitch fibers contract more quickly and with greater force than slow twitch fibers but they also fatigue much more quickly than slow twitch fibers. Muscles that have predominantly fast twitch fibers are used when rapid powerful movements are required. Weight training and the use of androgenic steroi ...
Nervous System PPT 4 - PNS
... Figure 12.13 A somatic reflex arc showing the path of a spinal reflex. A stimulus (for example, a sharp pin) causes sensory receptors in the skin to generate nerve impulses that travel in sensory axons to the spinal cord. Interneurons integrate data from sensory neurons and then relay signals to mot ...
... Figure 12.13 A somatic reflex arc showing the path of a spinal reflex. A stimulus (for example, a sharp pin) causes sensory receptors in the skin to generate nerve impulses that travel in sensory axons to the spinal cord. Interneurons integrate data from sensory neurons and then relay signals to mot ...
Effects of cutting a mixed nerve
... DEGENERATION: • When a nerve fibre is cut or severely crushed, degenerative changes take place at 3 levels: 1.Changes in the nerve cell body 2.Changes in the central/proximal stump (RETROGRADE DEGENERATION) 3.Changes in the distal stump (WALLERIAN DEGENERATION also called the Secondary Degeneration ...
... DEGENERATION: • When a nerve fibre is cut or severely crushed, degenerative changes take place at 3 levels: 1.Changes in the nerve cell body 2.Changes in the central/proximal stump (RETROGRADE DEGENERATION) 3.Changes in the distal stump (WALLERIAN DEGENERATION also called the Secondary Degeneration ...
Bio 12 - Test Review..
... Sodium/Potassium pump works to repolarize membrane AP continues along the axon ...
... Sodium/Potassium pump works to repolarize membrane AP continues along the axon ...
Anatomical Terminology
... d. Locus: Small but well defined mass of neuron cell bodies 3. Ganglion is a term referring to collection of neurons in the PNS. 4. Terms referring to axons: a. White matter: Generic term for a collection of axons b. Tract (projection): Set of axons, also known as fibers refers to CNS project from o ...
... d. Locus: Small but well defined mass of neuron cell bodies 3. Ganglion is a term referring to collection of neurons in the PNS. 4. Terms referring to axons: a. White matter: Generic term for a collection of axons b. Tract (projection): Set of axons, also known as fibers refers to CNS project from o ...
Chapter 12 The Nervous System
... y Located towards the back of the brain, controls muscle co-ordination. This structure contains 50 percent of the brain’s neurons. By controlling our muscle coordination, the cerebellum helps us maintain our balance. y Thalamus y Known as a sensory relay center. It receives the sensations of touch, ...
... y Located towards the back of the brain, controls muscle co-ordination. This structure contains 50 percent of the brain’s neurons. By controlling our muscle coordination, the cerebellum helps us maintain our balance. y Thalamus y Known as a sensory relay center. It receives the sensations of touch, ...
Adult Cortical Plasticity
... -- Persistent increase or decrease in synaptic response due to repetitive activity, found in hippocampus and cortex -- Brief high-frequency stimulation – LTP Prolonged low-frequency stimulation – LTD Mechanism: 1. Induction of either LTP or LTD requires postsynaptic Ca2+ rise. ...
... -- Persistent increase or decrease in synaptic response due to repetitive activity, found in hippocampus and cortex -- Brief high-frequency stimulation – LTP Prolonged low-frequency stimulation – LTD Mechanism: 1. Induction of either LTP or LTD requires postsynaptic Ca2+ rise. ...
Ch 31: Urinary System
... - Long, thin fiber…makes neurons longest cells in body - Carries electrical signal away from cell body - Allows signals to be carried large distances - Multiple axons are bundled together to form “nerves” ...
... - Long, thin fiber…makes neurons longest cells in body - Carries electrical signal away from cell body - Allows signals to be carried large distances - Multiple axons are bundled together to form “nerves” ...
Ch. 7 - The Nervous System
... C. Action potential 1. If the action potential (nerve impulse) starts, it is propagated over the entire axon 2. Impulses travel faster when fibers have a myelin sheath 3. The exchange of ions initiates an action potential in the neuron D. Repolarization 1. Potassium ions rush out of the neuron after ...
... C. Action potential 1. If the action potential (nerve impulse) starts, it is propagated over the entire axon 2. Impulses travel faster when fibers have a myelin sheath 3. The exchange of ions initiates an action potential in the neuron D. Repolarization 1. Potassium ions rush out of the neuron after ...
Senses - Peoria Public Schools
... • Cornea is transparent and helps focus light rays - anterior portion of eye - contains few cells and blood vessels - many nerve fibers • Sclera is the white part of the eye - protects the eye and is an attachment for ...
... • Cornea is transparent and helps focus light rays - anterior portion of eye - contains few cells and blood vessels - many nerve fibers • Sclera is the white part of the eye - protects the eye and is an attachment for ...
Lecture12 PPT
... 1. The differential permeability of the membrane to the ions. The membrane contains ion channels that allow ions to pass through the membrane. The membrane is most permeable to K+ and Cl-, and last permeable to negatively charged protein ions. 2. The action of sodium-potassium pumps. These pumps con ...
... 1. The differential permeability of the membrane to the ions. The membrane contains ion channels that allow ions to pass through the membrane. The membrane is most permeable to K+ and Cl-, and last permeable to negatively charged protein ions. 2. The action of sodium-potassium pumps. These pumps con ...
14.1-NervousMusculo-Skeletal-System
... The myelin sheath is a protein-rich gel that coats the arms of neurons (the dendrites and axons), creating electrical insulation. Describe the ‘gap’ between neurons. What is it called? How does a signal pass through this ‘gap’? The gap between the neurons is called the synapse. This is where an el ...
... The myelin sheath is a protein-rich gel that coats the arms of neurons (the dendrites and axons), creating electrical insulation. Describe the ‘gap’ between neurons. What is it called? How does a signal pass through this ‘gap’? The gap between the neurons is called the synapse. This is where an el ...
Neuromuscular junction
A neuromuscular junction (sometimes called a myoneural junction) is a junction between nerve and muscle; it is a chemical synapse formed by the contact between the presynaptic terminal of a motor neuron and the postsynaptic membrane of a muscle fiber. It is at the neuromuscular junction that a motor neuron is able to transmit a signal to the muscle fiber, causing muscle contraction.Muscles require innervation to function—and even just to maintain muscle tone, avoiding atrophy. Synaptic transmission at the neuromuscular junction begins when an action potential reaches the presynaptic terminal of a motor neuron, which activates voltage-dependent calcium channels to allow calcium ions to enter the neuron. Calcium ions bind to sensor proteins (synaptotagmin) on synaptic vesicles, triggering vesicle fusion with the cell membrane and subsequent neurotransmitter release from the motor neuron into the synaptic cleft. In vertebrates, motor neurons release acetylcholine (ACh), a small molecule neurotransmitter, which diffuses across the synaptic cleft and binds to nicotinic acetylcholine receptors (nAChRs) on the cell membrane of the muscle fiber, also known as the sarcolemma. nAChRs are ionotropic receptors, meaning they serve as ligand-gated ion channels. The binding of ACh to the receptor can depolarize the muscle fiber, causing a cascade that eventually results in muscle contraction.Neuromuscular junction diseases can be of genetic and autoimmune origin. Genetic disorders, such as Duchenne muscular dystrophy, can arise from mutated structural proteins that comprise the neuromuscular junction, whereas autoimmune diseases, such as myasthenia gravis, occur when antibodies are produced against nicotinic acetylcholine receptors on the sarcolemma.