Which of the following is an evolutionary hypothesis to explain morning sickness?
A. It alerts the woman that she is pregnant so that she is careful not to expose herself to harmful substances.
B. It is a natural form of birth control.
C. It is an adaptation to protect the embryo from toxins.
D. It prevents too much weight gain during pregnancy.
E. It is a vestigial artifact left over from early mammalian ancestors.
Answer: C
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Undescended testes cause infertility because
A. they undergo apoptosis, and can no longer produce sperm. B. there is too little testosterone. C. sperm development is impeded by the higher internal body temperature. D. they become entangled in the seminiferous tubules, which then degenerate.
Which of the following is not an origin for parasympathetic preganglionic fibers?
A. Sacral region of the spinal cord B. Hypothalamus C. Pons D. Medulla oblongata E. Midbrain
Prior to lipase digestion of triglycerides, the solution would be _______.
A) more acidic and less alkaline B) more basic C) less alkaline D) more acidic
The sensor in tubuloglomerular feedback is a group of cells called the ________.
A. macula lutea B. glomerulus C. macula densa D. vasa recta