Researchers in a lab are working with a form of stem cells that can divide and give rise to any cell type, allowing them to research development. This cell type is known as
A. totipotent.
B. a differentiated cell.
C. pluripotent.
D. multipotent.
Answer: A
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Skin cells play an important role in producing
A) vitamin B. B) vitamin A. C) vitamin D. D) vitamin C.
Which statement about nervous systems is NOT true?
a. The arthropod nervous system has ganglia that lie within the central nervous system. b. Arthropods have a solid and dorsal nerve cord c. The nerve cord of vertebrates has a segmental branching pattern. d. In vertebrates, interneurons are only found in the central nervous systems.. e. In vertebrates only two neurotransmitters control the effector organ responses regulated by efferent neuronal terminals.
Which of the following accounts for the increased osmolality with prolonged exercise in a hot environment?
A. The decreased blood volume due to increased sweating and lack of water intake increase the blood osmolality. B. ADH production triggers the increased reabsorption of water in renal tubules trigger the increase in blood osmolality. C. The osmoreceptors trigger the thirst mechanism, triggering an increase in blood osmolality. D. The increased production of aldosterone leads to an increase in the blood osmolality.
Which level consists of related organs that work to achieve a common function?
A. Chemical level B. Tissue level C. Organ system level D. Cellular level E. Organ level