This figure shows a cross section of the spinal cord. What structure does number 4 indicate?
A. Posterior median sulcus
B. White commissure
C. Anterior funiculus
D. Lateral funiculus
E. Anterior median fissure
E
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Following birth, the infant's metabolic rate
A. increases and its oxygen consumption increases. B. decreases and its oxygen consumption increases. C. increases and its oxygen consumption decreases. D. decreases and its oxygen consumption decreases.
This figure shows a posterior view of the right thigh. What muscle does number 2 indicate?
A. Semitendinosus B. Semimembranosus C. Biceps femoris D. Adductor magnus E. Gluteus maximus
In mammals, heart size tends to be proportional to body weight while heart rate is inversely proportional to body weight. What is the most probable explanation for pygmy shrews having unusually large hearts but an unusually slow heart rate?
A) Pygmy shrews are very active so they need large hearts. B) It is possible that the heart rate of shrews has reached its absolute limitation, so a large heart can pump more blood with each beat. C) Since pygmy shrews are tiny, their heart size differs from other mammals and their heart rate is slow when they are at rest. D) The heart size of pygmy shrews varies depending on latitude.
Which of the following is true of cell division?
A) Protein synthesis in preparation for division occurs during the S phase of interphase. B) Its importance diminishes after an individual grows to maturity. C) It requires mitosis only to produce two daughter cells. D) It requires accurate duplication (replication) of the genetic material. E) Each dividing cell produces four cells at a time.