Masses of myelinated nerve fibers appear a. white. b. gray. c. brown. d. transparent. Answer: A 2. Which of the following lists the parts of a reflex arc in the correct sequence? a. receptor‚ sensory neuron‚ motor neuron‚ interneuron‚ effector b. effector‚ receptor‚ sensory neuron‚ motor neuron‚ interneuron c. effector‚ sensory neuron‚ receptor‚ interneuron‚ motor neuron d. receptor‚ sensory neuron‚ interneuron‚ motor neuron‚ effector Answer: D 3. When a nerve fiber is polarized
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is break also. The peripheral nervous system consists of the nerves that branch from the brain and spinal cord. It is a thick bundle of nerve fibers located within the spinal cord. The PNS can be regenerate and it will regrow. The brain and spinal cord are the main parts of the nervous system. The brain controls every part of your body and is located top of our head inside our skull. The spinal cord with controls our movement. Nerve cells contain 3 parts: dendrites‚ cell body and the axon. Dendrite
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consists of the brain‚ spinal cord‚ nerves‚ ganglia‚ and parts of the receptor and effector organs. Your nervous system is composed of the central nervous system‚ the cranial nerves‚ and the peripheral nerves. The brain and spinal cord together form the central nervous system. The cranial nerves connect the brain to the head. The four groups of nerves that branch from the cervical‚ thoracic‚ lumbar‚ and sacral regions of the spinal cord are called the peripheral nerves. The peripheral nervous system
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having repeated nerve damage. When someone has Leprosy and it is untreated they can lose sensation in that extremity due to the body’s defense mechanism. This will cause loss of feeling in the skin and weakens muscle. B. Leprosy can affect the skin and Schwann cells of peripheral nerves. Which events of sensation processing are most likely not functioning properly in Sannu’s leprosy? Generation of nerve impulses is probably not working properly. Sensory neurons conduct impulses from the peripheral
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visceral pleura and outer layer called parietal pleura. While the visceral pleura does not have nocicpetors and does not give rise to the pain sensation‚ the parietal pleura can sense pain when inflamed‚ since it is innervated by numerous somatic nerves that have somatic pain receptors. Between the two layers‚ there is a space called pleural space that has a thin layer of fluid‚ and its function is to lubricate the pleural surfaces when breathing. When the surfaces become roughened and inflamed because
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Polarization of the neuron’s membrane: cell membrane is surrounded by neurons as other cell has a membrane. If a nerve cell is not stimulated‚ the membrane is known to be polarized. For a neuron to be polarized‚ it is by maintaining excess of sodium ions on the outside of the cell and excess potassium ions on the inner part of the cell. A volume of sodium ions and potassium ions usually leaks through its channel but the sodium ions and potassium ions pumps on the membrane that restores the (k+) back
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surrounds the core of a nerve fiber or axon and that facilitates the transmission of nerve impulses‚ formed from the cell membrane of the Schwann cell in the peripheral nervous system and from oligodendroglia cells. Myelin sheaths three main functions include are protection of the nerve fiber‚ insulation of the nerve fiber and increasing the rate of conduction of nerve impulses. Dendrites Dendrites are a short branched extension of a nerve cell‚ along which impulses received from other cells
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Immaculate Heart of Mary College SY 2012-2013 BIOLOGY EXCRETORY SYSTEM MODULE Urea is the main nitrogenous waste excreted by most mammals and is formed in the liver. It circulates the body and most of the urea produced by the body is transported to the kidneys. ORGANS OF EXCRETION ORGAN | WASTE EXCRETED | Skin | Sweat | Lungs | Carbon dioxide | Liver | Water‚ salts | Large intestine | Feces | Kidneys | Urine | THE KIDNEYS The kidneys are the main organs of excretion
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neurons Back ligand gates mechanical gates Front this conduction type is faster and more energy efficient and involves myelinated neurons Back saltatory Front this is the name for a bundle of axons in the PNS Back nerve Page 5
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Anatomy review for the nervous system - Week 12 Study Guide 1. Distinguish the difference between neuron‚ neuroglial cells‚ Schwann cells‚ neurofibrils‚ and astrocytes. Neuron: masses of nerve cells in nervous tissue Neuroglial Cells: provide neurons physiological requirements (fill spaces‚ give support to neurons) Schwann Cells: larger axons of peripheral neurons enclosed in sheaths Neurofibrils: thin‚ long fibrils that run through body of neuron and extends to axon and dendrites; gives neuron
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