The ovary receives blood from which artery/arteries?
A. Uterine
B. Ovarian and uterine
C. Broad
D. Ovarian and broad
E. Ovarian
Answer: B
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Thyroxine is a peptide hormone, but its mechanism is different from other peptide hormones. Which of the following statements is true concerning this difference?
A) It causes positive feedback. B) It does not require a second messenger to effect a response. C) It is very specific in the cell type it targets. D) It is a stimulant of cellular metabolism and targets all cells.
Urea is
A. completely reabsorbed by the nephron. B. diffuse out of the collecting ducts into the interstitial fluid of the medulla and then diffuse into the descending loop of Henle. C. secreted into the filtrate by cells of the distal convoluted tubule. D. actively transported into the filtrate by cells of the collecting duct. E. None of the choices are correct.
Answer the following questions true (T) or false (F)
1. Serous fluid lubricates around organs and reduces friction as the organ moves against adjacent structures. 2. Negative feedback loops produce responses in the opposite direction of the initial stimulus while positive feedback loops produce responses in the same direction of the initial stimulus. 3. According to the principle of complementarity of structure and function, structure and function are related only at the cellular level.
Nail growth occurs at the nail:
A) cuticle. B) body. C) bed. D) matrix.