Epithelial membranes are composed of both epithelial tissue and connective tissue. Energy producing metabolism and the synthesis of the macromolecules used by the cell to maintain its structure and execute its function are the principal activities of the neuronal soma. For example, when the transfer of information occurs from an axon to axon or from one terminal to another, the synapse involved is called an axoaxonic synapse. C. Protoplasmic astrocytes This answer is CORRECT! Chapter 3 - OpenStax Anatomy and Physiology 2e. Chapter 3 cells and tissues answer key page 30. It has been estimated that there are roughly 360 billion glial cells, which comprise 80-90% of the cells in the CNS. In addition, microtubules are not continuous, and each microtubule is composed of numerous 100 nm units. 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. Ribosomes are particles composed of ribosomal RNA and ribosomal protein which associate with mRNA and catalyze the synthesis of proteins.
Chapter 27 - The Reproductive System. The other type of process in the idealized neuron is the axon. Chapter 28 - Development and Inheritance.
An endoplasmic reticulum is present that regulates Ca2+ level. At first they form the three primary germ layers. These are termed interfascicular oligodendroglia and are involved in the formation and maintenance of the myelin surrounding the neuronal processes nearby. Axons also contain bundles of microtubules and neurofilaments and scattered mitochondria. Chapter 3 cells and tissues answer key page 42. This section will cover the general classifications of the neuroglial cells and describe some of the general properties that distinguish neuroglia from neurons. 8, the trigger zone does not have to be immediately adjacent to the cell body. The macroglia are of ectodermal origin and consist of astrocytes, oligodendrocytes and ependymal cells.
Nucleolus is in the center of the nuclei of all neurons. The nucleolus synthesizes ribosomal RNA, which has a major role in protein synthesis. These cells myelinate axons differently than the interfascicular oligodendroglia. Information is received by the dendrite through an array of receptors on dendrite surface that react to transmitters released from the axon terminals of other neurons. D. Ependymal cells This answer is INCORRECT. As these cells become specialized, they lose their ability to differentiate into all tissues. 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. Find d dx log 4 3 x A 1 3 x ln 4 B 1 x ln 4 C 1 x D 3 x ln 4 E 3 x Page 1 of 11. 1 Introduction to Neurons and Glial Cells. Epithelial tissue refers to groups of cells that cover the exterior surfaces of the body, line internal cavities and passageways, and form certain glands. Each germ layer is identified by its relative position: ectoderm (ecto- = "outer"), mesoderm (meso- = "middle"), and endoderm (endo- = "inner"). This virtual slide box contains 275 microscope slides for the learning histology. 8 Cellular Elements at the Typical Nerve Terminal. The cone-shaped region of the cell body where the axon originates is termed the axon hillock.
An automobile uses gasoline at a rate of 35 migal which is the same as kmL 1 km. The most numerous cellular constituents of the central nervous system are the non-neuronal, neuroglial ("nerve glue") cells that occupy the space between neurons. This is the choroid plexus studied in the Laboratory that is responsible for the secretion, uptake and transport of substances to and from the CSF. Morphologically the "dendrite" and the "axon" may, therefore, be indistinguishable. Chapter 3 cells and tissues answer key lime. They are the predominant cell type in white matter where they are often located as rows of cells between groups of neuronal processes. Epithelial tissue is made of layers of cells that cover the surfaces of the body that come into contact with the exterior world, line internal cavities, and form glands. Their enzymes act at an acidic pH. For example, they utilize and respond to different neurotransmitter(s). 12 Glial Cells and Function. Some cells have a myelinated process that transmits signals toward the cell body.
These cilia move cerebrospinal fluid (CSF) in the ventricles. The term tissue is used to describe a group of cells that are similar in structure and perform a specific function. Chapter 20 - The Cardiovascular System: Blood Vessels and Circulation. Membrane Transport Transcript. In Nissl stains, the fibrous astrocytes have a nucleus essentially the same as that of the protoplasmic type with a flecked appearance. It may be the site of branching of the axon, the site of synaptic contacts, or it may be covered with various glial processes. Upload your study docs or become a. It is important to note that the region of the axon exposed at the node of Ranvier is not bare. Chapter 5 - Energy - Whole Package - Copy (1) (2). Chapter 19 - The Cardiovascular System: The Heart. It is the neurofilament that stains with heavy metal to permit the visualization of neuronal shape. In the Peripheral Nervous System (PNS), Schwann cells are responsible for the myelin formation. The most MAPs in an axon have a lower molecular weight than those in the dendrite.
Cell bodies of oligodendroglia are often located near capillaries, but they lack the definite perivascular end feet characteristic of astrocytes. These categories are epithelial, connective, muscle, and nervous. After reviewing the Model Neuron above, learn more about the function of each structure by tapping from the list below. The dendritic processes and spines of neurons are essentially expansions of cytoplasm containing most of the organelles found in the cell body. Although neuronal neurofilaments are classified as intermediate filaments, their composition in neurons is different than that found in other cells. Identify the main tissue types and discuss their roles in the human body. Which of the following cell types is responsible for the maintenance of pH of the extracellular space of the CNS? The dense material on the postsynaptic side is a site where receptor proteins and channels are prevalent. 104. blackberry stands that conflict with grazing are not attractive to nesting. However, this distinction does not hold for ALL neurons.
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