An experimental subject is isolated in an underground room with no windows, no clocks, and no contact with the outside world. Researchers monitoring his behavior observe that he eats breakfast a little bit later each day. What term best describes the subject's biological activity?
A. Entrainment
B. Circadian rhythm
C. Free-running rhythm
D. Phase shift
E. Jet lag
Answer: C
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A) goblet cells and squamous epithelial cells B) parietal cells and glial cells C) serous cells and mucous cells D) cuboidal epithelium and ciliated columnar cells
The only cause of hypotonicity is drinking excess fluid
Indicate whether the statement is true or false
Which of the following is the correct order of structures sperm must penetrate before entering the ovum?
A. Corona radiata, zona pellucida, ovum plasma membrane B. Ovum plasma membrane, zona pellucida, corona radiata C. Zona pellucida, corona radiata, ovum plasma membrane D. None apply.
Which statement about reflexes is true?
A. A reflex is involuntary. B. A reflex has a fast response. C. A reflex is a motor response. D. All of these statements are true.