In Nissl stains, the fibrous astrocytes have a nucleus essentially the same as that of the protoplasmic type with a flecked appearance. 16, they migrate around the axon, laying a membrane covering around the axon by squeezing out the cytoplasm of the Schwann cell. Chapter 3 cells and tissues answer key anatomy and physiology coloring workbook. Identify the four types of tissue in the body, and describe the major functions of each tissue. The zygote is described as omnipotent because it ultimately gives rise to all the cells in your body including the highly specialized cells of your nervous system.
This is because thin cytoplasmic bridges connect the region of the oligodendrocyte cell body to the external wrap of myelin. Chapter 1 - An Introduction to the Human Body. 2 Client may initially be unaware of the dissociative response Knowl edge of the. This region is analogous to the initial segment of the model neuron, discussed above. Protoplasmic astrocytes are found primarily in gray matter. During injury, the astrocytes proliferate and phagocytize dead cells. 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. 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. As cell proliferation progresses, three major cell lines are established within the embryo.
Identify the main tissue types and discuss their roles in the human body. 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. Protein Synthesis Transcript. Moreover, more than one oligodendrocyte contributes to the myelination of a single internode of an axon. The human nervous system is estimated to consist of roughly 360 billion non-neural glial cells and 90 billion nerve cells. Rough endoplasmic reticulum and ribosomes are present in large but not small dendrites. Chapter 3 cells and tissues answer key pdf. Student/Faculty Email. Epithelial Membranes. A connective tissue membrane is built entirely of connective tissue. In the century that followed, the theory that cells represented the basic unit of life would develop.
As described in Chapter 6, it also acts as a receptive area for synaptic inputs from other cells. Microfilaments are especially prominent in synaptic terminals, in dendritic spines, and in association with the axolemma. Muscle tissue, which responds to stimulation and contracts to provide movement, is divided into three major types: skeletal (voluntary) muscles, smooth muscles, and the cardiac muscle in the heart. The nerve ending often has aggregations of dense material in the cytoplasm immediately adjacent to the membrane on the pre- and postsynaptic side of the junction (these are known as presynaptic density or postsynaptic density, respectively. ) An understanding of the various primary tissue types present in the human body is essential for understanding the structure and function of organs which are composed of two or more primary tissue types. Critical Thinking Questions. Chapter 3 cells and tissues answer key page 30. Chapter 10 - Muscle Tissue. The nucleus of a protoplasmic astrocyte is ellipsoid or bean-shaped with characteristic flecks of chromatin. Organs are assembled from the four basic types of tissues and have cells with specialized functions. Because these cells start out developmentally as bipolar neurons and then become unipolar as they mature, they are called pseudo-unipolar cells. The nucleolus synthesizes ribosomal RNA, which has a major role in protein synthesis. 3What statement is used to remove information or data stored in a database. C. Protoplasmic astrocytes. Link to a video of a tour of a cell.
These functions will be discussed in later sections. Routinely the fiber or process, which contains the initial segment or trigger zone, is referred to as an axon. The skin is an example of a cutaneous membrane. The microtubule associated proteins (MAPs) in the dendrite have a higher molecular weight than those found in the axon.