Explain the structure and contents of the nucleus, as well as the process of DNA replication. The cells composing a tissue share a common embryonic origin. Link to chapter three in the OpenStax Anatomy & Physiology 2e book. The rough ER, in laminae with interspersed ribosomes, is visible with the light microscope as Nissl substance.
Myelin is the sleeve of membranous material described by Dr. Byrne, that wraps the neuronal axon as shown in Figure 8. OpenStax Anatomy & Physiology. Interactive Link Questions. List the stages of the cell cycle in order, including the steps of cell division in somatic cells. After reviewing the Model Neuron above, learn more about the function of each structure by tapping from the list below. 15, a single oligodendrocyte contributes to the myelination of several adjacent nerve processes. A mucous membrane, sometimes called a mucosa, lines a body cavity or hollow passageway that is open to the external environment. Chapter 3 - The Cellular Level of Organization - Anatomy & Physiology OER - LibGuides at Georgia Highlands College. The most MAPs in an axon have a lower molecular weight than those in the dendrite. When ribosomes are attached to the outer membranes of the ER, the organelle is termed rough ER. 2 shows the types of tissues and organs associated with each of the three germ layers. Although a great deal of variation exists in the size and shape of boutons of individual neurons, synapses can be identified by the presence of the following: Figure 8.
Note that epithelial tissue originates in all three layers, whereas nervous tissue derives primarily from the ectoderm and muscle tissue derives from the mesoderm. The dimers of α and β tubulin subunits polymerize to form proto-filaments arranged in an a helix such that 13 dimer subunits make up each full turn of the a helix. These functions will be discussed in later sections. Epithelial membranes are composed of both epithelial tissue and connective tissue. View an EM slide of an axon hillock. Chapter 3 cells and tissues answer key page 43. Following the cells of the ectodermal germ layer, they too become more restricted in what they can form.
Microfilaments are 7 nm in diameter filaments arranged as a paired helix of two strands of globular actin. Many mitochondria are present, especially in the nerve terminal; and. This is one aspect of homeostasis. 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. Ultimately, some of these ectodermal cells become further restricted and differentiate in to nerve cells. Click the identified structures on the model neuron to move to the related section. These cells myelinate axons differently than the interfascicular oligodendroglia. Characteristics of nuclei, including size, shape, staining intensity, and distribution of chromatin, are used to distinguish cell types in pathological material. It is the neurofilaments that undergo modification in the Alzheimer's disease to form neurofibrillary tangles. Chapter 3 cells and tissues answer key of life. 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. The apical surface of this membrane exposed to the external environment and is covered with dead, keratinized cells that help protect the body from desiccation and pathogens. It may be the site of branching of the axon, the site of synaptic contacts, or it may be covered with various glial processes.
Also, every internode of a PNS axon represents a single Schwann cell. The MAPS regulate the polymerization of tubulin subunits to form the microtubules. The cleft between the presynaptic cell and the postsynaptic cells is 20 to 40 nm wide and may appear clear or striated. More recent evidence indicates that the astrocytes can dramatically change size as part of their physiological regulation of the neuronal environment. The nucleus in neurons is spherical and ranges in diameter from 3 to 18 micrometers depending on the size of the neuron. It is a prominent, deeply stained spherical inclusion about one-third the size of the nucleus. Graduation/Transcripts. Cell body characteristics, including size, shape, location, branching pattern, and density of processes, are also used. Lysosomes form from the budding off the Golgi apparatus. Chapter 3 cells and tissues answer key quizlet. 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. The nucleolus synthesizes ribosomal RNA, which has a major role in protein synthesis. Embryonic Origin of Tissues. This dense material on the presynaptic side is thought to be the site of vesicle attachment.
Connective tissue, as its name implies, binds the cells and organs of the body together. 8 Cellular Elements at the Typical Nerve Terminal.
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