The most important muscle associated with breathing is the
A. diaphragm.
B. quadratus lumborum.
C. external intercostal.
D. intertransversarii.
E. rotators.
Answer: A
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The spinal tract that unconsciously maintains balance and muscle tone is the ________ tract
A) lateral corticospinal B) anterior corticospinal C) rubrospinal D) reticulospinal E) vestibulospinal
Select the correct statement about the uterine cycle.
A) The menstrual phase of the cycle is from day 1 to day 8. B) During the secretory phase, estrogen levels are at their highest. C) During the proliferative phase, levels of progesterone rise as the follicle begins to produce more hormone. D) If fertilization occurs, the corpus luteum is maintained by a hormone secreted by the developing embryo.
A child falls and breaks his humerus, the upper arm bone, along the epiphysial plate. Which of the following could result from this injury?
A. As an adult, red marrow will persist in the medullary cavity of the humerus. B. Blood cell production will decrease dramatically in the injured bone. C. As an adult this person will have one humerus longer than the other. D. As an adult, the diaphysis of the broken humerus will be much smaller than that of the unbroken one.
The fact that the structures of cells vary widely reflects the specializations needed for their different functions.
Answer the following statement true (T) or false (F)