41) The subpapillary plexus
A) nourishes the dermal papillae and epidermis.
B) nourishes the hypodermis and reticular layer of the dermis.
C) provides the sensation of fine touch.
D) provides the sensation of deep pressure.
42) The color of red or blonde hair is due to
A) carotene.
B) oxygenated hemoglobin.
C) porphyrins.
D) a different type of melanin.
43) The most external layer of a hair shaft is the
A) medulla.
B) cuticle.
C) cortex.
D) epidermal root sheath.
44) Since both hair and skin contain keratin, the hair shaft is most comparable to what part of the epidermis?
A) stratum corneum
B) melanocytes
C) basal lamina
D) stratum basale
45) Pimples begin
A) as localized infections in the hypodermis.
B) as tiny cuts and nicks in the skin.
C) when bacteria enter sweat pores.
D) when sebaceous glands become blocked by sebum.
46) The black part of a blackhead is
A) oxidized sebum.
B) dirt.
C) a growing hair stub.
D) excreted carbon.
47) The "cheesy" layer on the skin of a newborn is
A) lanugo.
B) baby sweat.
C) seborrhea.
D) vernix caseosa.
48) An appendage or layer of the skin that does not develop from ectoderm is the
A) stratum spinosum.
B) hair follicle.
C) stratum corneum.
D) dermis.
49) The type of skin cancer that is most common and has the lowest metastasis rate is
A) basal cell carcinoma.
B) squamous cell carcinoma.
C) malignant melanoma.
D) leukopenia.
50) Any condition involving absence or loss of hair is called
A) psoriasis.
B) alopecia.
C) impetigo.
D) vitiligo.