death rates from heart disease‚ stroke‚ accidents‚ etc. The nervous system is a network of neurons (nerve cells) that that sends information to the brain to be analyzed. Neurons live both in and outside the central nervous system. Understanding how the neurons work is vital to understanding the nervous system. Neurons The neuron has two important structures 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
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3. Why don’t the terms depolarization and action potential mean the same thing? The terms depolarization and action potential differ because are excitable cells that communicate by transmitting electrical impulses that are capable of producing rapid electrical signals and depolarization in the interior surface of the membrane which becomes less negative and the exterior surface becomes less positive. Additionally‚ when depolarization reaches a certain threshold‚ an action potential is initiated
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muscular activity. The supply of oxygen is also increased. The increased supply of oxygen necessitates an increase in the rate of respiration‚ heart beat and increased blood flow via blood vessels. When physical exercise is stopped‚ the activities of nerves‚ lungs‚ heart and kidney gradually return to their normal conditions. Thus‚ the functions of muscles‚ lungs‚ heart‚ blood vessels‚ kidney and other organs are coordinated while performing physical exercises. In our body the neural system and the
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#1; Notebooks Due Unit 1 Notebook Score: 2/23 (Mon) Exam #1; Notebooks Due Unit 1 Notebook Score: Exam followed by Reflexes & Sensory Phenomena 2/23‚ 2/25 Reflexes; Sensory Phenomena Homework PhysioEx #3: Neurophysiology of Nerve Impulses 3/2‚ 3/4 Sensory Phenomena Lab (contd) 3/9‚ 3/11 Exam #2; Notebooks Due Unit 2 Notebook Score: 3/16‚ 3/18 Muscle Physiology (Biopac) Homework PhysioEx #2: Skeletal Muscle Physiology 3/23‚ 3/25 Electrocardiogram (Biopac) Homework
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mechanoreceptors found in the ears. Oooh‚ that smell: Olfaction Olfactory cells line the top of your nasal cavity. On one end‚ olfactory cells have cilia — hair-like attachments — that project into the nasal cavity. On the other end of the cell‚ are olfactory nerve fibers‚ which pass through the ethmoid bone and into the olfactory bulb. The olfactory bulb is directly attached to the cerebral cortex of your brain. As you breathe‚ anything that is in the air that you take in enters your nasal cavity: hydrogen
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BIOLOGY Are eyes enough to enjoy this natural splendour ...? Didn’t you notice the picture drawn by Raju and its caption? What is your opinion about the caption? You too might have got the opportunity to enjoy such scenes from nature. What have your blissful experiences in such situations been? — — — — — Colourful scenes The chirping of birds The gentle pat of the breeze The intoxicating fragrance of flowers The honey-sweetness of mango 7 BIOLOGY Though these are different experiences
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systems. Cnidarians have a network of loosely arranged nerve cells throughout their bodies‚ forming a nerve net. Flatworms such as planarians exhibit a rudimentary brain with nerve cords traversing the length of their bodies. Mammals have highly evolved nervous systems. They have large brains which process information and sense organs located near the brain. The human nervous system is made up of nerves‚ the brain‚ and the spinal cord. The nerves themselves do not form one single system‚ but several
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When the connection is made‚ it is in the form of an electrical impulse which travels down the connections between neurons. The neurons that carry these electrical impulses contain small gaps called synapses. These are important because they allow electrical activity‚ and hence brain functioning‚ to take place. In order for an impulse (or message) to go from one neuron across the synapse to another neuron‚ a number of important enzymes‚ called neurotransmitters
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cerebral cortex / left hemisphere i 1 2 3 ii 8 B 1m SSA helps select or identify correct words from past experience or memory / understand the language / process written words. 1m It sends nerve impulses to muscles of the mouth and face to form words. 1m It receives impulses from the eyes / optic nerve and passes impulse to visual association area. Speech association area A 1m 1m 1m 1m 1m 1m 1m Endocrine glands produce hormones which diffuse directly into the blood. Exocrine glands release their secretions
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Laboratory – Muscle Physiology A. MUSCLE TONUS Observations‚ Report and Conclusion: A. Define muscle tonus and give its importance * Muscle tonus refers to a state of slight muscular contraction maintained by synchronous impulses of low frequency‚ discharged by the spinal motor neurons. * Reflex in nature. * Muscle tonus is a small amount of tension in the muscle due to weak‚ involuntary contractions of its motor units. Muscle tonus is important in a sense that it governs the
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