TAMU BIOL 319 LAB PRACTICAL (1-5) EXAM 2026
UPDATED QUESTIONS AND CORREC T DETAILED
ANSWERS WITH RATIONALES (VERIFIED ANSWERS)
|AGRADE
Histology - CORRECT ANSWER >>>The study of tissues
Epithelial, connective, muscle and neural - CORRECT ANSWER >>>4 major types of tissues:
Epithelial Tissue - CORRECT ANSWER >>>Line and cover organs as well as their internal
passageways. Made of sheets of cells, joined tightly together via strong intercellular
connections.
yes - CORRECT ANSWER >>>Are Epithelial tissues avascular?
Simple squamous epithelium - CORRECT ANSWER >>>Description: Single layer of flattened cells
with disc-shaped central nuclei and sparse cytoplasm; the simplest of this type of tissue.
Function: Allows passage of materials by diffusion and filtration in sites where protection is not
important; secretes lubrication substances in serosae
Location:Found in the kidney glomeruli; air sacs of the lungs; lining of the heart, blood vessels
and lymphatic vessels; lining of mental body cavity.
Simple cuboidal epithelium - CORRECT ANSWER >>>Description: Single layer of cube-like cells
with large, spherical central nuclei
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, Function: Secretion and absorption
Location: Kidney tubules; ducts and secretory portions of small glands; ovary surface
Simple columnar epithelium - CORRECT ANSWER >>>Description: Single layer of tall cells with
round to oval nuclei; some cells bear cilia; layer may contain mucus-secreting unicellular glands
(goblet cells)
Function: Absorption; secretion of mucus, enzymes and other substances; ciliated type propels
mucus (or reproductive cells) by ciliary action
Location: Conciliated type lines most of the digestive tract (stomach to anal canal), gallbladder
and excretory ducts of some glands; ciliated variety lines small bronchi, uterine tubes and some
regions of the uterus
Stratified squamous epithelium - CORRECT ANSWER >>>Description: thick membrane
composed of several layers; basal cells are cuboidal or columnar and metabolically active;
surface cells are squamous; in the keratinized type, the surface cells are full of keratin and
dead; basal cells are active in mitosis and produce the cells of the more superficial layers
Function: Protects underlying tissues in areas subjected to abrasion
Location: Nonkeratinized type forms the moist linking of the esophagus, mouth and vagina;
keratinized variety forms the epidermis of the skin, a dry membrane.
Pseudostratified ciliated columnar epithelium - CORRECT ANSWER >>>Description: Single layer
of cells of differing heights, some not reaching the free surface; nuclei seen at different level;
may contain mucus-secreting cells and bear cilia
Function: Secretion, particularly of mucus; propulsion of mucus by ciliary action
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UPDATED QUESTIONS AND CORREC T DETAILED
ANSWERS WITH RATIONALES (VERIFIED ANSWERS)
|AGRADE
Histology - CORRECT ANSWER >>>The study of tissues
Epithelial, connective, muscle and neural - CORRECT ANSWER >>>4 major types of tissues:
Epithelial Tissue - CORRECT ANSWER >>>Line and cover organs as well as their internal
passageways. Made of sheets of cells, joined tightly together via strong intercellular
connections.
yes - CORRECT ANSWER >>>Are Epithelial tissues avascular?
Simple squamous epithelium - CORRECT ANSWER >>>Description: Single layer of flattened cells
with disc-shaped central nuclei and sparse cytoplasm; the simplest of this type of tissue.
Function: Allows passage of materials by diffusion and filtration in sites where protection is not
important; secretes lubrication substances in serosae
Location:Found in the kidney glomeruli; air sacs of the lungs; lining of the heart, blood vessels
and lymphatic vessels; lining of mental body cavity.
Simple cuboidal epithelium - CORRECT ANSWER >>>Description: Single layer of cube-like cells
with large, spherical central nuclei
1|Page
, Function: Secretion and absorption
Location: Kidney tubules; ducts and secretory portions of small glands; ovary surface
Simple columnar epithelium - CORRECT ANSWER >>>Description: Single layer of tall cells with
round to oval nuclei; some cells bear cilia; layer may contain mucus-secreting unicellular glands
(goblet cells)
Function: Absorption; secretion of mucus, enzymes and other substances; ciliated type propels
mucus (or reproductive cells) by ciliary action
Location: Conciliated type lines most of the digestive tract (stomach to anal canal), gallbladder
and excretory ducts of some glands; ciliated variety lines small bronchi, uterine tubes and some
regions of the uterus
Stratified squamous epithelium - CORRECT ANSWER >>>Description: thick membrane
composed of several layers; basal cells are cuboidal or columnar and metabolically active;
surface cells are squamous; in the keratinized type, the surface cells are full of keratin and
dead; basal cells are active in mitosis and produce the cells of the more superficial layers
Function: Protects underlying tissues in areas subjected to abrasion
Location: Nonkeratinized type forms the moist linking of the esophagus, mouth and vagina;
keratinized variety forms the epidermis of the skin, a dry membrane.
Pseudostratified ciliated columnar epithelium - CORRECT ANSWER >>>Description: Single layer
of cells of differing heights, some not reaching the free surface; nuclei seen at different level;
may contain mucus-secreting cells and bear cilia
Function: Secretion, particularly of mucus; propulsion of mucus by ciliary action
2|Page
