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- Myelination beginning Аxon Internode Oligodendrocytes Neurolemma The myelin sheath and The myelin sheath in the CNS Nodes Мyelin Schwann cell| of Ranvier myelination in the PNS (b)Axon can't branch Afferent neurons are generally bipolar neurons Most neurotransmitters are synthesized in the cytosol of a neuron GABA is the most common inhibitory neurotransmitter in the central nervous system Tendons are regular dense connective tissue that connect muscles to bone2.) what of these nerve fiber has action potenital moving toward the central nervous system ? sensory fiber sympathetic nerve fiber parasympatheic nerver fiber motor fiber question 3 : The autonimic nervous system controls involuntary muscle such as the cardiac & smooth muscle true False question 5 It is important to remeber to the neurogila cells are not direclty part of ; A.) forming insulating membrane to cover the axon b. ) anchoring neuron to capilliares or nutrient supply c. ) controlling the neuron enviornment d. ) begin a pathways for the action potential
- Regeneration of a severed axon has a better chance forsuccess in the PNS than in the CNS. Why is regeneration inthe CNS less likely to succeed?What term means that a tissue can generate action potentials without a stimulus O Autocontractile O None of these is correct O Autonomic O SA node O AutorhythmicWatch this short video (http://openstaxcollege.org/l/facialnerve) to see an examination of the facial nerve using some simple tests. The facial nerve controls the muscles of facial expression. Severe deficits will be obvious in watching someone use those muscles for normal control. One side of the face might not move like the other side. But directed tests, especially for contraction against resistance, require a formal testing of the muscles. The muscles of the upper and lower face need to be tested. The strength test in this video involves the patient squeezing her eyes shut and the examiner trying to pry her eyes open. Why does the examiner ask her to try a second time?
- Hansen's disease, also known as leprosy, arises when bacteria infect the Schwann cells that wrap around axons of peripheral nerves to form a myelin .shealth. Attacks by the immune system on the bacteria-infected glial cells causes a loss of myelin in peripheral nerves. How is Hansen's disease similar to multiple sclerosis? Why do the symptoms differ? Why are people with Hansen's disease unusually prone to injuring themselves?Watch this animation (http://openstaxcollege.org/l/bloodflow1) to see how blood flows to the brain and passes through the circle ofWillis before being distributed through the cerebrum. The circle of Willis is a specialized arrangement of arteries that ensure constant perfusion of the cerebrum even in the event of a blockage of one of the arteries in the circle. The animation shows the normal direction of flow through the circle of Willis to the middle cerebral artery. Where would the blood come from if there were a blockage just posterior to the middle cerebral artery on the left?Read this article (http://openstaxcollege.org/l/strokespell) to learn about a teenager who experiences a series of spells that suggest a stroke. He undergoes endless tests and seeks input from multiple doctors. In the end, one expert, one question, and a simple blood pressure cuff answers the question. Why would the heart have to beat faster when the teenager changes his body position from lying down to sitting, and then to standing?
- How do Myclin, Conduction t Rnde Of Ranvier. relate? action potentials, saltaryThis cell provides myelination within the centrallnervous system, allowing for, speed of conduction of the action potential O astrocytes, increased O microglia, decreased O neurons, decreased O oligodendrocytes, increasedPart D- Organization of the Sympathetic Nervous System The divisions of the autonomic nervous system are distinctly organized. Place the term into the bin that best describes its location. • View Available Hint(s) Reset Help Short preganglionic fiber Long preganglionic fiber Long postganglionic fiber Chain ganglia Thoracolumbar origins Vagus nerve (CN X) Ganglia within target tissue Pelvic nerves Sympathetic division Parasympathetic division Submit