After a person turns 40, what is the rate of nephron loss in the kidneys?
A. Five percent per year.
B. Five percent per decade.
C. Ten percent per decade.
D. Twenty percent per decade.
Ans: C. Ten percent per decade.
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Microscopic examination of a tissue reveals a loose framework of fibers embedded in a large volume of fluid ground substance, with a wide variety of cell types. This tissue would most likely have come from the
A) inner wall of a blood vessel. B) lungs. C) spleen. D) superficial fascia between skin and muscle. E) bony socket of the eye.
Second messenger molecules directly
A) change enzyme activity. B) change regulation of gene expression. C) increase intracellular calcium concentration. D) change the regulation of ion channels. E) All of the answers are correct.
The sense of taste projects to the gustatory cortex located in the
A) insula. B) temporal lobe. C) frontal lobe. D) prefrontal cortex. E) occipital lobe.
The skin is a barrier to all of the following except ________
A) water B) UV rays C) infectious organisms D) metals such as mercury