How does melanin protect the skin from the effects of ultraviolet light?
What will be an ideal response?
Melanin protects the skin from damage by absorbing the ultraviolet radiation before it reaches the deep layer of the epidermis, especially the stratum basale with its mitotically active cells, and the dermis.
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In the day or two before milk secretion begins, the breasts secrete ________
Fill in the blank(s) with correct word
Dual innervation of organs by both branches of the autonomic nervous system allows a fine degree of control over these organs
Indicate whether the statement is true or false
Which of the following is not a function of the Sertoli cells?
a. secreting seminiferous tubule fluid b. phagocytizing cytoplasm extruded from developing sperm and destroy defective sperm c. secreting testosterone d. secreting inhibin e. providing nourishment for developing sperm
The secondary or memory response
A. occurs after the primary response has activated NK cells. B. provides better protection than the primary response. C. is less effective in antibody production. D. produces different antibodies than those produced in the primary immune response. E. does not protect the body after the first exposure.