In some regions of the neuron ER is devoid of ribosomes and is termed smooth ER. The myelin sheath acts to insulate the plasmalemma of the axon in a way that necessitates the more rapid spread of the depolarization of the plasmalemma and increases the speed of conduction of the nerve impulse (see Chapter 3). As shown in Figure 8. Link to chapter three in the OpenStax Anatomy & Physiology 2e book. Dendrites contain numerous orderly arrays of microtubules and fewer neurofilaments (see below). On the left is the pyramidal cell named for its characteristic pyramid shape. 15, a single oligodendrocyte contributes to the myelination of several adjacent nerve processes. Two variations in cell morphology. What is the function of synovial membranes? Cells and tissues worksheet. The rough ER, in laminae with interspersed ribosomes, is visible with the light microscope as Nissl substance. In inhibitory neurons the synaptic vesicle are often flattened as shown in Figure 8. A cutaneous membrane is a multi-layered membrane composed of epithelial and connective tissues. An epithelial membrane is composed of an epithelial layer attached to a layer of connective tissue. Chapter 13 - Anatomy of the Nervous System.
After studying this chapter, you will be able to: - Describe the structure and function of the cell membrane, including its regulation of materials into and out of the cell. Link to a slide-show also covering DNA replication. 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. Chapter 3 cells and tissues answer key page 45. What happens when a terminally differentiated cell reverts to a less differentiated state? Nervous tissue is also excitable, allowing for the generation and propagation of electrochemical signals in the form of nerve impulses that communicate between different regions of the body (Figure 4.
Chapter 27 - The Reproductive System. More recent evidence indicates that the astrocytes can dramatically change size as part of their physiological regulation of the neuronal environment. Chapter 3 cells and tissues answer key page 30. A comparison of the various neuroglial types is shown in Figure 8. Ependymal cells are derived from the early germinal epithelium lining the lumen of the neural tube and thus are also ectodermal derivatives (along with neurons, astrocytes, and oligodendrocytes).
The underlying connective tissue, called the lamina propria (literally "own layer"), helps support the epithelial layer. Vesicles containing inhibitory neurotransmitter are often flat or elliptical whereas vesicles that contain excitatory neurotransmitter are usually more spherical. Chapter 6 - Bone Tissue and the Skeletal System. Neurofilaments run in loose bundles around the cell nucleus and other organelles and funnel into the base of the axonal and dendritic processes where they form parallel arrays distributed longitudinally. Tissues are organized into four broad categories based on structural and functional similarities. There is a distinct synaptic cleft or intercellular space of approximately 20-40 nm. This dense material on the presynaptic side is thought to be the site of vesicle attachment. Often, neurons that look similar have strikingly different properties. 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. Because these cells start out developmentally as bipolar neurons and then become unipolar as they mature, they are called pseudo-unipolar cells. This section reviews the cellular components of nervous tissue. Link to a gif showing dispersion/diffusion.
These are spherical vesicles in excitatory nerve endings, shown in Figure 8. The neurofilaments in the axon hillock become clustered together as fascicles. Cells in the inner layer of the synovial membrane release synovial fluid, a natural lubricant that enables the bones of a joint to move freely against one another with reduced friction. A presynaptic complement of membrane-bound synaptic vesicles exists. After fertilization, the zygote gives rise many cells to form the embryo. Aggregations of cells in the human body be classified into four types of tissues: epithelial, connective, muscle, and nervous. They are arranged in a single-layered columnar epithelium, and have many of the histological characteristics of simple epithelium, which vary from squamous to cuboidal depending upon their location. The region of the neuron containing the nucleus is known as the cell body, soma, or perikaryon (Figure 8. View an EM slide of an axon hillock.
The axon itself is often surrounded by a membranous material, called the myelin sheath, formed by glia cells. Many lysosomes become degraded to lipofuscin granules, which accumulate as the organism ages and are regarded as neuronal refuse. Neurofilaments are involved in the maintenance of the neuron's shape and mechanical strength.
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