The rearrangement and migration of the cells of the bilaminar embryonic disc forms the trilaminar embryonic disc in a process called:
A) formation of the blastula. B) organogenesis.
C) fertilization. D) gastrulation.
Answer: D
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The pinkish hue of individuals with fair skin is the result of the crimson color of oxygenated hemoglobin (contained in red blood cells) circulating in the dermal capillaries and reflecting through the epidermis
Indicate whether the statement is true or false
Which substance is responsible for activating the digestive enzymes inside lysosomes?
A) water B) base C) air D) acid E) enzymes
How is autocrine regulation best described?
A. Chemical regulators are released directly into blood vessels. B. Chemical regulators released by cells affect the functional status of different kinds of cells in the vicinity of the secretory cell. C. Chemical regulators affect the same cells that produce them. D. Chemical regulators reach their site of action through a duct. E. Chemical regulators are continuously released in constant amounts by the cell.
Which of the following prevents the skin from overstretching and gives it strength?
A. Melanin B. Collagen fibers C. Elastic fibers D. Adipose tissue