Lymphatic organs of the oral cavity and pharynx are the:
A. Thymus and Spleen
B. Lymph Nodes
C. Peyer's Patches
D. Tonsils
Answer: D. Tonsils
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Which of the following statements concerning development of the integumentary system is true?
A. Sensory receptors in the skin are derived from the epidermis. B. Collagen fibers do not appear until after birth. C. The epidermis is derived from mesoderm. D. The melanocytes are derived from ectoderm. E. Nails, hair, and glands develop from the dermis.
Which respiratory organ is a common passageway for both the respiratory and digestive system?
A) Nasal cavity B) Larynx C) Pharynx D) Bronchus
Why wasn't there a live low-train high group?
A study was done in 1998 by Dr. Benjamin Levine to explore the role of altitude training in athletic performance. First he trained athletes at low altitude, then measured their finish times in a 5 kilometer run. Then the athletes were placed into one of the following groups: I, living and training at high altitude; II, living at high altitude and training at low; or III, living and training at low altitude. The athletes were then retested in another low-altitude 5 K race. In this study, what are the control and experimental data? What are the dependent and independent variables? The results are expressed as average change in speed of each group. I: -3.4 sec., II: +13.4 sec., III: -26.7 sec. Graph and interpret the results. Did the results surprise you? Why or why not? Propose some explanations for the lower performance by the live high-train high group.
Fertilization usually occurs in the
A) vagina. B) ovary. C) uterus. D) uterine tube.