Since embryonic and fetal development progress from the cranial to the caudal areas of the body, the ________ of a 2-month embryo takes up about one-half of the total body height.
A. head and trunk
B. head
C. trunk
D. upper limbs
E. lower limbs
Answer: B
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Which of the following does not contribute to the establishment of a vertical osmotic gradient in the interstitial fluid of the renal medulla?
a. The renin-angiotensin-aldosterone system b. Countercurrent multiplication in the long loops of Henle of juxtamedullary nephrons c. Urea recycling between the collecting tubule and long loops of Henle d. All of the above contribute to the establishment of the gradient. e. None of the above contribute to the establishment of the gradient.
Which of the following is NOT a definition of sex, according to the text?
A. Behavior that increases the likelihood of gametic union B. The state of being a male or a female C. Behavior that increases the chance of orgasm D. Behavior that produces arousal
Keratinocytes
A. produce skin pigments in cell organelles called melanosomes. B. are responsible for the reduction of water loss from the skin. C. determine thickness of the skin. D. are special cells of the immune system. E. are found in both the dermal and the epidermal layers of the skin.
Which type of hormone requires a carrier protein in the blood?
A. Lipid-soluble hormone B. Oligopeptide C. Water-soluble hormone D. Autocrine hormone