BIO 226 Chp 4 Tissues
Choose the answer that shows the correct order for the standard preparation of a histological specimen. -(1) staining, (2) fixation, (3) sectioning -(1) sectioning, (2) staining, (3) fixation -(1) fixation, (2) sectioning, (3) staining -(1) sectioning, (2) fixation, (3) staining -(1) fixation, (2) staining, (3) sectioning
(1) fixation, (2) sectioning, (3) staining -The correct order for specimen preparation is fixation, then sectioning, followed by staining.
Which of the following is NOT a role of connective tissue? -support -absorption -transport -insulation
Absorption -Absorption, the movement of substances into the body, is a role of epithelial tissue. Roles of connective tissue include binding and support, protection, insulation, and transportation of substances, via blood, within the body.
You observe a uniform tissue under a microscope. There is no lumen. The material looks densely packed, but you do not observe many nuclei. It appears that there are strands of fibers running in parallel directions. What type of tissue are you looking at? -nervous tissue -connective tissue -epithelial tissue -muscle tissue
Connective tissue -You are probably looking at dense regular connective tissue. Connective tissue has a low cell count compared to the extracellular matrix.
Which of the following is NOT a characteristic of nervous tissue? -highly branched cells -creates linings -used for support and insulation -transmits electrical impulses
Creates linings -Cells that create the body's linings are all derived from epithelia.
Which of the following statements is true? -All subclasses of loose connective tissue do not contain collagen fibers -Dense connective tissue includes a great deal of collagen -Dense connective tissue includes a large amount of reticular fibers -Loose connective tissue includes cartilage.
Dense connective tissue includes a great deal of collagen -Correct, the prominent element of dense connective tissue are the fibers. Dense regular connective tissue primarily has parallel collagen fibers and a few elastic fibers. Dense irregular connective tissue primarily has irregularly arranged collagen fibers and some elastic fibers. Elastic connective tissue contains a high proportion of elastic fibers.
How are endocrine and exocrine glands different from each other? -Exocrine glands secrete hormones. -Endocrine glands have no ducts. -Exocrine glands are only unicellular in structure. -Exocrine glands have specific target organs for their secretions.
Endocrine glands have no ducts. -Endocrine glands secrete substances (hormones) into blood without the use of ducts, whereas exocrine glands use ducts to secrete substances into the external environment.
Which of the following is a property of epithelial tissue: -Epithelial tissue is typically unable to regenerate. -Epithelial tissue is innervated. -Epithelial tissue does not exhibit polarity. -Epithelial tissue contains blood vessels.
Epithelial tissue is innervated. -Epithelial tissue is an innervated, avascular tissue that exhibits polarity. Epithelial tissue is also highly regenerative.
Pseudostratified epithelia are well adapted to the digestive system because the cilia increase the surface area for absorption True of False
False -Pseudostratified epithelia are found in the respiratory linings. Cilia are used for movement, not increasing surface area.
All muscle cells contain striations. True of False
False -Smooth muscle cells do not contain striations. Although they do contain myofilaments, their arrangement is not regular enough to generate the striations seen in skeletal or cardiac muscle cells.
Which of the following describes a holocrine gland? -Holocrine glands secrete their products by pinching off the apex of the cell. -Holocrine glands secrete their products by rupturing. -Holocrine glands secrete their products through a hollow, tubular duct. -Holocrine glands secrete their products by exocytosis.
Holocrine glands secrete their products by rupturing. -Holocrine glands secrete their products by rupturing. Sebaceous (oil) glands are the only example of holocrine glands in the body.
Which event must precede all others during tissue repair? -Epithelia reproduce and migrate to the damaged area. -Clotting occurs in the damaged area. -Fibroblasts produce collagen that strengthens the area surrounding the tissue damage. -Inflammation occurs near the affected cells.
Inflammation occurs near the affected cells -Inflammation is the first part of the tissue repair. The inflammatory events set the stage for the tissue repair process.
The correct order of events in tissue repair, from first to last, is __________. -regeneration, organization, and inflammation -inflammation, organization, and regeneration -organization, inflammation, and regeneration -inflammation, regeneration, and organization
Inflammation, organization, and regeneration -In order, the basic steps of tissue repair are inflammation, organization, and regeneration.
__________ are water-soluble, complex glycoproteins that are secreted by goblet cells. -Mucins -Amino acids -Salts -Enzymes -Hormones
Mucins -Like mucous cells, goblet cells are unicellular exocrine glands that secrete mucin, a protein that combines with water to form mucus. In goblet cells, the cuplike accumulation of mucin distends the top of the cell, making these cells look like a glass with a stem, thus "goblet" cell. This distortion does not occur in mucous cells.
An exocrine gland that has an unbranched duct would be classified as a __________. -unicellular compound gland -multicellular compound gland -unicellular simple gland -multicellular simple gland
Multicellular simple gland -Multicellular exocrine glands with unbranched ducts are "simple"; those with branched ducts are "compound." Unicellular exocrine glands do not have ducts.
Which of the following are INCORRECTLY paired? -connective tissue; mesoderm -epithelium; endoderm and ectoderm -nervous tissue; ectoderm -muscle; endoderm
Muscle; endoderm -Muscle is derived from the mesoderm.
In connective tissue, the role of elastic fibers is to __________. -form delicate networks around blood vessels -retain fluid -provide flexibility -provide tensile strength
Provide flexibility -Elastic fibers contain elastin, a rubberlike protein that allows them to stretch and recoil like rubber bands, making them very flexible.
You observe a tissue under a microscope. There appears to be a lumen on one side of the tissue. Lining this lumen, the cells seem to have long, fingerlike projections. Beneath the projections, the cells seem to have the shape of shoeboxes and are packed tightly together. What type of tissue are you looking at? -simple columnar epithelia -simple cuboidal epithelia -stratified squamous epithelia -transitional epithelia
Simple columnar epithelia -The shoebox represents the columnar shape. Additionally, the fingerlike projections are likely to be microvilli.
Which of the following statements is INCORRECT? -Simple squamous epithelia are associated with filtration and exchange. -Simple columnar epithelia are associated with absorption and secretion. -Simple cuboidal epithelia are found in areas that stretch. -Stratified squamous epithelia are found in areas subjected to wear and tear.
Simple cuboidal epithelia are found in areas that stretch. -This statement is false, so it is the correct answer. Transitional (not simple cuboidal) epithelia are found in areas that stretch, in particular the ureters and urinary bladder. Simple cuboidal epithelia are adapted for absorption and secretion. We find that most glands consist of cuboidal epithelia.
What function do transitional epithelia have? -filtration -resistance to friction -absorption -stretching
Stretching -Transitional epithelium is found in the urinary system. It lines the ureters, bladder, and proximal part of the urethra--organs that are subjected to distention or stretching as urine passes through or fills them. Provide Feedback
Which of the following statements is INCORRECT? -Mucous membranes line exits and entrances to the body. -The cutaneous membrane is a dry membrane exposed to air. -The cutaneous membrane is made of a simple columnar epithelium -Serous membranes line body cavities and organs.
The cutaneous membrane is made of a simple columnar epithelium -The cutaneous membrane, a "dry" membrane exposed to air, consists of a keratinized, stratified squamous epithelium called the epidermis, and an underlying layer of connective tissue called the dermis.
All epithelia have two surfaces, an apical surface and a basal surface, that differ in both structure and function. This property is called polarity. True or False
True -All epithelia exhibit polarity, which is defined by the presence of an apical, or free, surface and a basal, or attached, surface that differ in both structure and function.
Which tissue is correctly paired with its primary cell type? -cartilage; fibroblast -bone; fibrocyte -connective tissue proper;chondroblast -bone; osteoblast
bone; osteoblast -Osteoblasts/cytes are the primary cell type for bone.
Choose the answer that shows the correct order for the standard preparation of a histological specimen.
fixation, sectioning, staining
Which of the following does NOT describe a multicellular exocrine gland? alveolar glands tubular glands hormone glands simple glands
hormone glands -Glands that secrete hormones are endocrine, or ductless glands. Exocrine glands are all ducted glands.
Smooth muscle __________. -has striations -contains intercalated discs -is under involuntary control -has long, cylindrical cells
is under involuntary control -Smooth and cardiac muscle are under involuntary control. Skeletal muscle is under voluntary control.
Which of the following epithelial tissue types is NOT correctly matched to its function? -stratified squamous epithelium; absorption -simple squamous epithelium; filtration -simple cuboidal epithelium; secretion -simple columnar epithelium with microvilli; absorption
stratified squamous epithelium; absorption -Stratified squamous epithelium (like you would find in the skin) is adapted for protection, not absorption from the external environment.