The pyloric sphincter, the circular muscle that controls the entrance of food from the stomach to the
small intestine, usually opens only slightly. What is the purpose of this?
What will be an ideal response?
Since the small intestine is small in diameter (approximately 4 cm), it cannot accommodate all the
food from the stomach at once. Since the pyloric sphincter is only slightly open, small amounts of the
watery chyme can enter the small intestine as the stomach churns. These small aliquots of chyme will
not overly distend the small intestine.
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Iodine can be complexed with an organic carrier to form water-soluble, stable complexes called ________, which release iodine slowly and eliminate skin burns and irritation associated with iodine use.
A. iodochromes B. iodophors C. tinctures D. iodides
Water enters the sponge spongocoel through the:
a. choanocytes. b. spicules. c. ostia. d. osculum. e. pinocytes.
The Pap test for cervical cancer involves microscopic examination of cervical cells for cancerous cells. A new, rapid diagnostic test to detect human papilloma virus (HPV) DNA before cancer develops is done without microscopic exam. The steps involved in this FastHPV test are listed below. What is the second step?
a. Add an RNA probe for HPV DNA. b. add enzyme substrate. c. Add enzyme-linked antibodies against DNA-RNA. d. Lyse human cells. e. The order is unimportant.
What are the two forms of fibrous connective tissue?
A. bone and blood B. adipose and cartilage C. loose fibrous and dense fibrous D. hyaline cartilage and elastic cartilage E. fibroblasts and matrix