Lines of cleavage are a result of
A. the alignment of dermal papillae.
B. the orientation of collagen fibers in the dermis.
C. the alignment of epidermal ridges.
D. wounds to the epidermis such as hemangiomas.
B
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Which of the classes of hormones are synthesized by the endoplasmic reticulum-Golgi complex mechanism?
a. peptides b. catecholamines c. steroids d. thyroid hormone e. both peptides and catecholamines are correct.
Where do preganglionic neurons originate?
A) pons and medulla B) frontal lobe of the cerebrum C) parietal lobe of the cerebrum D) cerebellum
The diagram illustrates accessory structures of the skin. What does "D" represent?
A. Hair follicle B. Duct of eccrine sweat gland C. Sweat pore D. Eccrine sweat gland E. Sebaceous gland
Rod cells are filled with a pigment called ________, and the lack of it can lead to ________.
A. vitreous humor; glaucoma B. rhodopsin; night blindness C. rhodopsin; color blindness D. melanin; nearsightedness