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Epithelial tissue refers to groups of cells that cover the exterior surfaces of the body, line internal cavities and passageways, and form certain glands. The dendritic processes may branch extensively and are often covered with projections known as dendritic spines. Chapter 3 - OpenStax Anatomy and Physiology 2e. They are made up of dimers of α and β tubulin subunits and contain associated proteins known as microtubule associated proteins (MAPS). On the right is the cell soma and dendrites of the Purkinje cell found in the cerebellum and named for the scientist, Purkinje. Anatomy & Physiology 2. HEALTH SCIENCESPLTW211 - Chapter 2(Azares).docx - CELLS AND TISSUES 3 The basic unit of structure and function in the human body is the cell. Each of a cell’s parts, or | Course Hero. In addition, microtubules are not continuous, and each microtubule is composed of numerous 100 nm units. Synapse is the junction that allows signals to pass from a nerve cell to another cell or from one nerve cell to a muscle cell.
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5 Initial Segment and Axon Hillock. Ependymal cells line the ventricles of the brain and the central canal of the spinal cord. Critical Thinking Questions. Chapter 3 cells and tissues answer key.com. Dendrites may consist of a single twig-like extension from the soma or a multi-branched network capable of receiving inputs from thousands of other cells. C. Protoplasmic astrocytes This answer is CORRECT! A structural skin cell may be shaped like a flat plate (squamous) and live only for a short time before it is shed and replaced. 2 shows the types of tissues and organs associated with each of the three germ layers.
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The processes of oligodendrocytes are fewer and more delicate than astrocytes, and the cell body shape is polygonal to spherical. Students should be able to describe neurons and glia, their morphological components as seen with the light and electron microscope, and some of the fundamental functional roles these cell types play in the nervous system. Glutamine is then transported to the neuron to be re-synthesized into glutamate (see Chapter 13). 301. on fibers and hence is a subbundle On fibers it is exactly the line we want This. Chapter 3 cells and tissues answer key page 45. It may appear as densely stained ovoids or as finely dispersed particles or aggregations of granules.
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Chapter 17 - The Endocrine System. The ependyma forming the ventricular lining do not connect to a basal lamina, but rest directly upon underlying nervous tissue. The macroglia are of ectodermal origin and consist of astrocytes, oligodendrocytes and ependymal cells. Keep this theme in mind as you tour the inside of a cell and are introduced to the various types of cells in the body. The major distinguishing feature of fibrous astrocytes, as the name suggests, is an abundance of glial fibrils arranged in parallel arrays in the cytoplasm and extending into the processes. These membranes are found lining the external body surface (cutaneous membranes and mucous membranes) or lining the internal body cavities (serous membranes). Multinucleate Muscle Cell. Chapter 3 cells and tissues answer key page 42. Chapter 25 - The Urinary System. Axolemma is the plasmalemma of the axon. Which of the following is not an advantage of using bacteria for genetic studies. 3What statement is used to remove information or data stored in a database.
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Endosomal membrane that functions in the recycling of synaptic vesicles. This dense material on the presynaptic side is thought to be the site of vesicle attachment. 8, the trigger zone does not have to be immediately adjacent to the cell body. In addition, several metal stains are used show the shape of the cell and cytoplasmic architecture. Nucleolus is in the center of the nuclei of all neurons. This section reviews the cellular components of nervous tissue. Peroxisomes are small membrane bounded organelles that use molecular oxygen to oxidize organic molecules. Epithelial Membranes. 14, astrocytes form a complete lining around the external surface of the CNS (glial limitans) and around blood vessels (perivascular feet). Endoplasmic reticulum is a labyrinthine, membrane bounded compartment in the cytoplasm where lipids are synthesized and membrane bound proteins are made.
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The primary tissue types work together to contribute to the overall health and maintenance of the human body. A serous membrane lines the cavities of the body that do not open to the external environment. Link to a video where you can learn about the endomembrane system, which includes the rough and smooth ER and the Golgi body as well as lysosomes and vesicles. Neurofilaments are involved in the maintenance of the neuron's shape and mechanical strength. Muscle tissue contracts forcefully when excited, providing movement. GHC Notify/Campus Closings. Microfilaments are especially prominent in synaptic terminals, in dendritic spines, and in association with the axolemma.
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Myelin is composed of concentric layers of membranes compacted against one another with an internal (i. e. against the nerve fiber) and an external collar of cytoplasm. C. - D. - E. Which of the following cell types proliferate in the CNS in response to injury? Golgi apparatus is a collection of stacked, smooth-surfaced membrane bound organelles where proteins and lipids made in the endoplasmic reticulum are modified and sorted. Many of the terms used in this section are defined below. Many mitochondria are present, especially in the nerve terminal; and. These have been further sub-categorized into Golgi type II cells that are small neurons, usually interneurons, and Golgi type I cells that are large multipolar neurons. Protoplasmic astrocytes are found primarily in gray matter. Numerous variations of the "model" neuron described above exist. The axon in the nodal region usually contains concentrations of organelles, especially mitochondria. This cell is prominent in the cerebral cortex. In many cases, this region is the anatomical location for the initiation of the action potential. It may be the site of branching of the axon, the site of synaptic contacts, or it may be covered with various glial processes. Following damage to nervous tissue, microglia proliferate and migrate to the site of injury where they clear cellular debris by phagocytosis. Axons also contain bundles of microtubules and neurofilaments and scattered mitochondria.
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Serous fluid secreted by the cells of the epithelium lubricates the membrane and reduces abrasion and friction between organs. These are termed interfascicular oligodendroglia and are involved in the formation and maintenance of the myelin surrounding the neuronal processes nearby. In this chapter, you will learn about the major components and functions of a prototypical, generalized cell and discover some of the different types of cells in the human body. Thus, any disruption in the structure of a tissue can lead to injury or disease. These functions will be discussed in later sections.
For instance, an average spinal motor neuron with a moderate-sized dendritic tree, receives 10, 000 contacts, with 2, 000 of these on the soma and 8, 000 on the dendrites. 2 Client may initially be unaware of the dissociative response Knowl edge of the. Myelin is the sleeve of membranous material described by Dr. Byrne, that wraps the neuronal axon as shown in Figure 8. Discuss how a cell differentiates and becomes more specialized. Course Hero uses AI to attempt to automatically extract content from documents to surface to you and others so you can study better, e. g., in search results, to enrich docs, and more. A nerve cell, on the other hand, may be shaped something like a star, sending out long processes up to a meter in length and may live for the entire lifetime of the organism. 5 (see enlarged view). The branches of axons are known as axon collaterales.
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