Exercise 3: Neurophysiology of Nerve Impulses: Activity 2: Receptor Potential Lab Report Pre-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. 1. Assuming that the resting potential of a sensory neuron is -70 mV‚ which of the following represents a depolarization? You correctly answered: c. a change to -60 mV 2. Which of the following is a sensory modality (type of sense)? You correctly answered: e. all of the above 3. Which of the following is a sensory stimulus
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Figure 15.24b Structure of the ear. Oval window (deep to stapes) Entrance to mastoid antrum in the epitympanic recess Malleus (hammer) Incus Auditory (anvil) ossicles Stapes (stirrup) Tympanic membrane Semicircular canals Vestibule Vestibular nerve Cochlear nerve Cochlea Round window Middle and internal ear © 2013 Pearson Education‚ Inc. Pharyngotympanic (auditory) tube MIDDLE EAR STRUCTURES • Air-filled cavity in temporal bone • Auditory ossicles (outer to inner): – – – – – Malleus Incus Stapes
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Anatomy of the Thorax MCQ and Spotter Hint: Cross section: Which artery (vein also indicated)? The correct answer is: Internal thoracic artery Click on the correct name for this structure: The correct answer is: Descending aorta Click on the correct name for this structure The correct answer is: Rib: head The correct answer is: Pulmonary artery The correct answer is: Sternum: xiphoid process The correct answer is: Posterior intercostal artery The correct answer is: Brachiocephalic artery
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• Choroid - Middle layer of blood capillaries‚ which supply nutrients and oxygen. Its anterior dark screen with pupil is the iris. A convex lens is placed behind the iris. • Retina- The innermost layer on which‚ the image forms. The optic nerve starts from the retina. 3. The fluids filled in the chambers of eye ? • Aqueous humour – A watery fluid seen in the aqueous chamber [between cornea and lens] oozes from the blood. This fluid supplies nutrients and oxygen to cornea
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changes and feel sensations 2. Initiate responses to changes 3. Organize and store information Divisions 1. Central Nervous System – brain and spinal cord 2. Peripheral Nervous System – cranial nerves and spinal nerves (relays info to/from the CNS) - Autonomic Nervous System Nerve Tissue – neurons (nerve fibers) and specialized cells (Schwann‚ neuroglia) 1. Neuron cell body contains the nucleus; cell bodies are in the CNS or trunk; protected by bone 2. Axon carries impulses away from the cell
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Transport of vesicles facilitated by kinesin and the effects of mutations in nerve transmission in Caenorhabditis elegans Introduction A nerve cell is made up of three main structures: the soma‚ the axon and the synapse. When a nerve cell receives a signal‚ a protein called kinesin travels anterograde along the axon and guides the synaptic vesicles until it reaches the synapse. This triggers the release of the neurotransmitters stored within the vesicles. Once released‚ the neurotransmitters then
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Stenosis means "closing in" or "choking". Spinal stenosis describes a condition in which the nerves in the spinal canal are closed in‚ or compressed. The spinal canal is the hollow vertical hole formed by the bones of the spinal column. Anything that causes this bony hole to shrink can squeeze the nerves inside. This narrowing can irritate the nerve roots that branch out from the spinal cord‚ or it can squeeze and irritate the spinal cord itself. This may cause pain‚ numbness‚ or weakness‚ most
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diagonally. * opaque white tissue normal – white * systemic problems – icteric sclera b. CORNEA – dense transparent layer. The cornea is the transparent‚ clear layer at the front and center of the eye. It is well supplied with nerve endings. The main purpose of the cornea is to help focus light as it enters the eye. If one wears contact lenses‚ the contact lens rests on the cornea. normal – transparent‚ smooth‚ shiny & bright accident or eye injury – cloudy areas or specks
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of the body. Ultimately‚ all forms will cause nerve damage in the arms/hands and legs/feet‚ causing sensory loss in the skin and muscle weakness. This may cause the person with leprosy to lose an extremity affected by the disease. B: Schwann cells are involved in many important aspects of peripheral nerve biology. The conduction of nervous impulses along axons‚ nerve development and regeneration‚ trophic support for neurons‚ production of the nerve extracellular matrix‚ modulation of neuromuscular
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Now‚ paste an image found on LabPaq site or Google images of a teased myelinated nerve and label its basic parts (nodes of Ranvier‚ neurilemma‚ the axon‚ Schwann cell nuclei and myelin sheath) using the labeling boxes provided. myelin sheath Schwann cell Nuclei Axon node of Ranvier neurilemma Questions A. What is the function of a neuron? B. What is the difference between a neuron and a nerve? C. What gives a multipolar neuron its name? D. What are the functions of the
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