Match the epithelial tissue to an organ in which the tissue is found.
(1) simple squamous epithelium
(2) simple cuboidal epithelium
(3) simple columnar epithelium
A. lining of intestines
B. lining of ducts of mammary glands
(4) pseudostratified columnar epithelium
(5) stratified squamous epithelium
(6) stratified cuboidal epithelium
(7) stratified columnar epithelium
(8) transitional epithelium
(9) glandular epithelium
C. lining of urinary bladder
D. salivary glands
E. air sacs of lungs
F. respiratory passages
G. parts of male urethra
H. lining of kidney tubules
I. superficial layer of skin
The correct answer and explanation is :
The correct matching of epithelial tissue to the organs where they are found is as follows:
- Simple Squamous Epithelium:
- Answer: E. Air sacs of lungs
- Explanation: Simple squamous epithelium is composed of a single layer of flat cells. It is specialized for diffusion and filtration. This type of tissue is found in areas where the exchange of gases or materials needs to occur quickly and efficiently. In the lungs, it lines the air sacs (alveoli), where gas exchange (oxygen and carbon dioxide) occurs between the alveoli and capillaries.
- Simple Cuboidal Epithelium:
- Answer: H. Lining of kidney tubules
- Explanation: Simple cuboidal epithelium consists of a single layer of cube-shaped cells. This tissue type is involved in absorption and secretion. It lines the tubules of the kidneys, where it facilitates the absorption of water and salts from the filtrate in the renal system. It is also involved in the secretion of waste products.
- Simple Columnar Epithelium:
- Answer: A. Lining of intestines
- Explanation: Simple columnar epithelium is composed of a single layer of tall, column-like cells. It is well-suited for absorption and secretion. In the intestines, this type of epithelium lines the digestive tract and plays a critical role in absorbing nutrients from digested food. The cells also secrete digestive enzymes and mucus for lubrication.
- Pseudostratified Columnar Epithelium:
- Answer: F. Respiratory passages
- Explanation: Pseudostratified columnar epithelium appears to have multiple layers, but every cell is in contact with the basement membrane, making it a single layer. It is primarily found in the respiratory tract, including the trachea and bronchi. It helps trap and move particles out of the airways due to the presence of cilia and goblet cells that secrete mucus.
- Stratified Squamous Epithelium:
- Answer: I. Superficial layer of skin
- Explanation: Stratified squamous epithelium consists of multiple layers of flat cells. It functions as a protective barrier, preventing water loss and shielding underlying tissues from physical damage. It is found in areas subject to abrasion, such as the skin’s outermost layer (epidermis), the esophagus, and the mouth.
- Stratified Cuboidal Epithelium:
- Answer: B. Lining of ducts of mammary glands
- Explanation: Stratified cuboidal epithelium consists of two or more layers of cube-shaped cells. It is commonly found in the ducts of certain glands, including mammary glands, where it functions to protect and secrete substances.
- Stratified Columnar Epithelium:
- Answer: G. Parts of male urethra
- Explanation: Stratified columnar epithelium consists of several layers of column-shaped cells. It is found in parts of the male urethra and some glands. Its function is to protect and provide secretion, as in the case of the urethra, where it helps protect against abrasion and irritation from urine flow.
- Transitional Epithelium:
- Answer: C. Lining of urinary bladder
- Explanation: Transitional epithelium is specialized to stretch and recoil. It lines organs that need to expand and contract, such as the urinary bladder, ureters, and part of the urethra. This tissue allows the bladder to stretch as it fills with urine and then contract when empty.
- Glandular Epithelium:
- Answer: D. Salivary glands
- Explanation: Glandular epithelium forms the secretory units of glands. It is specialized for secretion and is found in various glands throughout the body, including salivary glands. These glands secrete saliva, which aids in digestion and oral health.
In summary, the various types of epithelial tissues are designed to perform specific functions, from absorption and secretion to protection and flexibility, depending on their location and structure. Each of these tissues is suited to its respective organ or system, highlighting the efficiency and specialization of epithelial cells.