1. What is the main feature of keratinized epithelium?
A.
It has a surface layer of dead, keratin-filled cells
B.
It contains many blood vessels between its cells
C.
It is made only of living, ciliated cells
D.
It has a surface layer of mucus-secreting cells
Correct Answer:
It has a surface layer of dead, keratin-filled cells
Explanation:
Keratinized epithelium has a surface layer of dead cells filled with keratin, which forms a tough protective covering.
2. Where is keratinized epithelium commonly found?
A.
Inner lining of the intestine
B.
Outer surface of the skin
C.
Inner lining of the urinary bladder
D.
Lining of the alveoli
Correct Answer:
Outer surface of the skin
Explanation:
Keratinized epithelium forms the outer surface of the skin, where it protects the body from physical damage and water loss.
3. What substance accumulates in the surface cells of keratinized epithelium?
A.
Keratin
B.
Mucus
C.
Bile
D.
Glycogen
Correct Answer:
Keratin
Explanation:
Keratin is a tough, protective protein that accumulates in the surface cells of keratinized epithelium.
4. What is one major function of keratinized epithelium?
A.
Protection against abrasion
B.
Secretion of digestive enzymes
C.
Absorption of nutrients
D.
Exchange of respiratory gases
Correct Answer:
Protection against abrasion
Explanation:
The tough keratinized surface protects underlying tissues from rubbing and other mechanical damage.
5. How does keratinized epithelium help prevent excessive water loss?
A.
Its keratinized surface forms a relatively waterproof barrier
B.
Its cells continuously release watery fluid
C.
Its surface contains numerous blood vessels
D.
Its cells absorb water from the environment
Correct Answer:
Its keratinized surface forms a relatively waterproof barrier
Explanation:
The keratin-rich surface of keratinized epithelium reduces the movement of water through the skin and helps prevent dehydration.
6. The cells at the exposed surface of keratinized epithelium are generally:
A.
Dead and filled with keratin
B.
Living and filled with mucus
C.
Ciliated and actively beating
D.
Contractile and branched
Correct Answer:
Dead and filled with keratin
Explanation:
The outermost cells of keratinized epithelium lose their nuclei and become dead, keratin-filled cells that provide protection.
7. Which property makes keratinized epithelium suitable for covering the skin?
A.
Its tough and resistant surface
B.
Its ability to produce digestive juices
C.
Its thin, moist, and highly permeable surface
D.
Its ability to conduct nerve impulses
Correct Answer:
Its tough and resistant surface
Explanation:
The tough, resistant keratinized surface is well suited to protect the body from injury and environmental exposure.
8. Keratinized epithelium mainly protects the body from:
A.
Friction and environmental damage
B.
Low oxygen concentration in blood
C.
Excess production of hormones
D.
Digestion of food in the stomach
Correct Answer:
Friction and environmental damage
Explanation:
Keratinized epithelium forms a protective barrier against friction, minor injuries, and other environmental stresses.
9. Why are the outermost cells of keratinized epithelium not easily damaged?
A.
They contain the tough protein keratin
B.
They contain many chloroplasts
C.
They are filled with digestive enzymes
D.
They are surrounded by cartilage
Correct Answer:
They contain the tough protein keratin
Explanation:
Keratin strengthens the outer cells and makes them more resistant to physical damage.
10. Keratinized epithelium is best described as a tissue that:
A.
Forms a dry, protective outer covering
B.
Forms a moist lining for rapid absorption
C.
Produces red blood cells
D.
Stores calcium in bones
Correct Answer:
Forms a dry, protective outer covering
Explanation:
Keratinized epithelium forms a dry outer covering, especially on the skin, where it provides protection and reduces water loss.
Short questions are currently unavailable for this page.