Select the correct statement regarding epithelia.
Stratified epithelia are tall, narrow cells.
Pseudostratified epithelia consist of at least two layers of cells stacked on top of one another.
Stratified epithelia are present where protection from abrasion is important.
Simple epithelia form impermeable barriers.
The Correct Answer is C
A. Stratified epithelia are tall, narrow cells: Stratified epithelia are defined by having multiple layers of cells, not by cell shape. While some stratified cells can be tall (columnar), they can also be cuboidal or squamous in shape, depending on the location.
B. Pseudostratified epithelia consist of at least two layers of cells stacked on top of one another: Pseudostratified epithelium appears multilayered because nuclei are at different levels, but all cells contact the basement membrane. It is not composed of multiple layers.
C. Stratified epithelia are present where protection from abrasion is important: Stratified epithelia provide multiple layers of cells, offering significant protection against mechanical stress, friction, and abrasion. This is why they are found in areas such as the skin, mouth, and esophagus.
D. Simple epithelia form impermeable barriers: Simple epithelia are composed of a single cell layer and allow for selective diffusion, absorption, or secretion rather than forming completely impermeable barriers.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. mammary and ceruminous:Mammary and ceruminous glands are specialized glands that produce milk and earwax, respectively. They are not classified as the main types of sweat glands.
B. eccrine and apocrine:Eccrine glands are widely distributed and produce watery sweat for thermoregulation, while apocrine glands are found in specific areas like the axillae and groin and secrete thicker sweat associated with scent. These two categories constitute the primary types of sudoriferous glands.
C. holocrine and mammary:Holocrine glands, such as sebaceous glands, release their product via whole-cell rupture and are not sweat glands. Mammary glands are specialized exocrine glands, so this pairing does not represent the main sweat gland types.
D. sebaceous and merocrine:Sebaceous glands secrete sebum and are oil-producing, not sweat-producing. Merocrine is another term for eccrine secretion, but the pairing with sebaceous glands incorrectly categorizes sweat glands.
Correct Answer is B
Explanation
A. fibrocartilage CT:Fibrocartilage is found in intervertebral discs and some joint areas, providing strong support and shock absorption, but it does not form the embryonic skeleton.
B. hyaline cartilage CT:The embryonic skeleton is primarily composed of hyaline cartilage, which provides a flexible template that allows growth and later ossification into bone during development.
C. elastic CT:Elastic connective tissue contains many elastic fibers, giving flexibility to structures like the lungs and large arteries, but it does not form the framework of the embryonic skeleton.
D. dense regular CT:Dense regular connective tissue forms tendons and ligaments with parallel collagen fibers, providing tensile strength, but it does not contribute to the embryonic skeletal framework.
E. elastic cartilage CT:Elastic cartilage is found in structures requiring flexible support, such as the ear and epiglottis, and is not the primary tissue of the embryonic skeleton.
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