called the dendrite and axon‚ also called nerve fibers. The dendrites are like tentacles that sprout from the cell and the axon is one long extension of the cell. The dendrites receive signals from other neurons‚ while the axon sends impulses to other neurons. Axons can extend to more than a meter long. Average sized neurons have hundreds of dendrites; therefore it can receive thousands of signals simultaneously from other neurons. The neuron sends impulses by connection the axon to the dendrites of
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muscles in your legs telling them to contract so you can stand up. 2. Refer to the diagram below to answer these questions: a) Identify the parts labeled a and b and describe their functions. a = dendrites b = axon b) What is c? c = myelin sheath c) How would a signal travel through this neuron differently if c were not present? The myelin sheath is a layer of insulation. It forces the nerve impulse to leap from node to node as shown
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contains the nucleus; cell bodies are in the CNS or trunk; protected by bone 2. Axon carries impulses away from the cell body; dendrites carry impulses toward it 3. Schwann cells in PNS: - Layers of cell membrane form the myelin sheath to electrically insulate neurons - nodes of Ranvier: spaces between adjacent Schwann cells - Nuclei & cytoplasm of Schwann cells form the neurolemma – essential for regeneration of damaged axons or dentrites 4. Oligodendrocytes: In CNS‚ form myelin sheaths - microglia
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pairs of cranial nerves and a neuron‚ is a nerve cell design to receive stimuli from the body and conduct impulses to cell nerves. (Page 230‚ Phoenix. A and Thomas (2007) mapping psychology .each nerve comprises of a cell body a central muscle called axons and dendrites. The three main types of nerve impulses one is the sensory neuron which receives stimuli from the sensory organ and sensory receptors i.e. Pain‚
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Chapter 16 p.2/3 10 HKCEE Biology 2004 I Q2c 11 HKCEE Human Biology 2004 I Q2c Essays (p. 16-31) 12 Nerve impulses are electrical messages transmitted along nerve fibres at high speed. 1m When a nerve impulse arrives the ending of an axon‚ it stimulates the ending to release neurotransmitters. 1m The neurotransmitters diffuse across the synapse 1m and stimulate the dendron of the next neurone to generate a nerve impulse to continue the transmission. 1m Importance: This ensures nerve
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Muscle Physiology: Activity 2: The Effect of Stimulus Voltage on Skeletal Muscle Contraction Lab Report Pre-lab Quiz 1. Skeletal muscle fibers are innervated (stimulated) by c. motor neurons. 2. A single action potential propagating down a motor axon results in d. a single action potential and a single contractile event in the muscle fibers it innervates. 3. In resting skeletal muscle‚ calcium is stored in c. the sarcoplasmic reticulum. 4. During the latent period for an isometric contraction
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slightly similar in nature‚ although much more devastating‚ to Fibromyalgia‚ Rhuematoid arthritis‚ and other autoimmune diseases. Early symptoms can be mild appearing as other ailments and‚ therefore‚ years may elapse between onset and diagnosis. In MS‚ axon demylination and nerve fiber loss occurs in patches throughout the central nervous system. This causes a wide spread and chronic dysfunction involving impulse transmission. For example‚ symptoms range from sensory-perceptual deficits to fatigue weakness
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lasts a lifetime once it develops. 3. The purpose of the nervous system is to convey messages in the form of electrical currents that travel along the nerves (axons) to the muscles and tissues‚ which allows us to move (analogous to an electrical wire). 4. In order to allow the efficient transfer of nerve impulses along the axons to the tissues‚ the nerves are insulated by a glycolipid substance known as myelin (i.e. how metal wires are insulated by rubber or plastic). 5. When
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evaluate the consequent nerve impulse for velocity‚ onset and amplitude. Neuropathies are caused by damage to the nerves axon and/or damage to the myelin sheath surrounding the nerve. If a response is slower than normal‚ damage to the myelin sheath is implied. If the height of the response’s amplitude is low with a relatively normal speed of conduction‚ damage to the nerve axon is implied. How will the test feel? • There is generally minimal discomfort with the test because the electrical
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Case Study 1 1. The Neuromuscular junction uses synapses to connect the muscular system with the muscular system. A nerve impulse is sent from the brain down to the motor neuron by way of the axon. Acetylcholine is released after the vesicles break open. Sodium channels are opened from Acetylcholine that bonds to the Acetylcholine receptors. Depolarization happens when Acetylcholine causes an area of the muscle fiber to become a little more positive when it leaves the nerve and docks on receptors
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