the pigment produced to protect the skin from the effects of ultraviolet run rays is
A. keratin
B. melanin
C. elastin
D. collagen
Select your answer:
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Tissues › ViewWhich of these epithelial types is correctly matched with its major function?
A. simple squamous epithelium – diffusion or filtration
B. stratified squamous epithelium – protection from abrasion
C. Simple cuboidal epithelium – active transport, facilitated diffusion, or secretion
D. Simple columnar epithelium – secretion or absorption
E. All these are correctly paired.
Anatomy Respiratory System › View
When one of the factors that aid the collapse of lungs during expiration is missing, the result is common disease. What is the name of the disease and the lack of which factor caused it?
A. Emphysema; results from lack of surface tension in alveolar fluid
B. Pneumonia; results from lack of surface tension in alveolar fluid
C. Emphysema; results from lack of elasticity
D. Wheresmydrinkma; results from lack of diet dr kelp