A positive feedback mechanism initiates the rhythmic contractions of labor. Determine the hormones involved in this feedback loop
A) relaxin and human chorionic gonadotropin (hCG)
B) prostaglandins and oxytocin
C) cortisol and aldosterone
D) estrogens and progesterone
Answer: B
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The motor pathways of the autonomic nervous system
A) show a neuronal organization like that of the somatic nervous system. B) contain both upper and lower motor neurons. C) control visceral effectors, such as smooth and cardiac muscle and glands. D) include only neurons located in the brain or spinal cord. E) All of the answers are correct.
Muscle strength peaks in a/an ________.
A. elderly adult B. middle aged adult C. adolescent D. young adult E. child
Frostbite results from peripheral ________ due to exposure to cold temperatures.
A. vasoconstriction B. vasodilation
What is the purpose of surfactant that lines each alveolus?
A. Gives the lungs their elasticity B. Increases the surface tension of water C. Keeps the alveoli from collapsing