CCP Integumentary System Anatomy 3 — Questions and Answers
Question 1: The nail plate grows from which structure?
- Nail bed
- Nail matrix (Correct answer)
- Lunula
- Cuticle
Correct answer: Nail matrix
The nail matrix is the tissue under the base of the nail where keratinized cells are produced to form the nail plate.
Question 2: Which type of sweat gland becomes active at puberty and is associated with body odor?
- Eccrine glands
- Merocrine glands
- Apocrine glands (Correct answer)
- Sebaceous glands
Correct answer: Apocrine glands
Apocrine glands, located in axillary and inguinal regions, become active at puberty and produce a secretion that bacteria break down to cause body odor.
Question 3: The white, crescent-shaped area visible at the base of the nail is called the:
- Hyponychium
- Eponychium
- Lunula (Correct answer)
- Nail fold
Correct answer: Lunula
The lunula is the whitish, crescent-shaped area at the nail base that represents the visible portion of the nail matrix.
Question 4: Sensory receptors called Meissner's corpuscles are located in which skin layer and detect which sensation?
- Reticular dermis — pressure
- Papillary dermis — light touch (Correct answer)
- Hypodermis — temperature
- Stratum basale — pain
Correct answer: Papillary dermis — light touch
Meissner's corpuscles sit in the dermal papillae of the papillary dermis and are specialized for detecting light touch.
Question 5: Which type of collagen fiber predominates in the dermis and gives skin its tensile strength?
- Type I collagen (Correct answer)
- Type II collagen
- Type IV collagen
- Type VII collagen
Correct answer: Type I collagen
Type I collagen is the most abundant collagen in the dermis, forming thick fibers that resist stretching and provide tensile strength.
Question 6: The skin's acid mantle, with a pH between 4.5 and 5.5, is formed by secretions from which glands?
- Apocrine glands only
- Eccrine glands only
- Both sebaceous and eccrine glands (Correct answer)
- Meibomian glands
Correct answer: Both sebaceous and eccrine glands
The acid mantle is a thin film created by a combination of sebum from sebaceous glands and sweat from eccrine glands that protects against pathogens.
Question 7: Pacinian corpuscles are sensory receptors that detect:
- Light touch and texture
- Deep pressure and vibration (Correct answer)
- Temperature changes
- Pain signals
Correct answer: Deep pressure and vibration
Pacinian corpuscles are large, encapsulated mechanoreceptors found deep in the dermis and hypodermis that respond to deep pressure and vibration.
CCP Integumentary System Anatomy 3
The nail plate grows from which structure?