Deck 11: Integumentary System

Question 1

Which structure is present in thin skin but lacking in thick skin?

A) Eccrine sweat glands
B) Hair follicles
C) Melanocytes
D) Stratum corneum
E) Stratum spinosum

Answer 1

B

Question 2

In the stratum granulosum of the skin,keratinocytes are filled with basophilic keratohyaline granules.These granules form as a result of which intracellular process?

A) Accumulation of hyaluronic acid
B) Degeneration of mitochondria
C) Formation of aggregations of profilaggrin
D) Fragmentation of the nucleus during keratinocyte apoptosis
E) Synthesis of hemidesmosomes

Answer 2

C

Question 3

Which molecules in the skin attach directly to the basal lamina beneath the keratinocytes?

A) Anchoring fibrils of type VII collagen
B) Banded fibers of type II collagen
C) Clathrin
D) Keratin fibers
E) Microtubules

Answer 3

A

Question 4

The function of Merkel cells in the skin is to:

A) Acquire and present antigens to lymphocytes
B) Function as mechanoreceptors that respond to pressure
C) React to heat via temperature-sensitive calcium channels
D) Synthesize melanin
E) Synthesize the bulk of keratin within the skin

Question 5

The abundant,clear cells found in eccrine sweat glands are specialized for:

A) Contraction during the production of sweat
B) Secretion of lipid molecules onto the skin
C) Synthesis of antibiotic molecules like dermicidin
D) Synthesis of melanin
E) Transport of sodium,chloride,and water

Question 6

A feature unique to keratinocytes in the stratum corneum is that cells in this location:

A) Contain basophilic keratohyaline granules
B) Have a short half-life and rapidly undergo mitosis to form new cells
C) Have large numbers of mitochondria
D) Lack discrete nuclei
E) Possess large numbers of desmosomes

Question 7

How do keratinocytes acquire melanin?

A) Keratinocytes acquire melanin precursors (e.g.,tyrosine)from melanocytes via plasma membrane amino acid transporter proteins
B) Keratinocytes phagocytize cytoplasmic processes of melanocytes that contain melanosomes
C) mRNA molecules that code for melanin proteins are exported from melanocytes to keratinocytes
D) Melanocytes synthesize melanocyte-stimulating hormone.,which binds to receptors on keratinocytes
E) Melanocytes undergo apoptosis and export melanosomes via a holocrine mode of secretion