The bile and pancreatic duct ducts enter which of the following structures?
(a) 2nd portion of the duodenum
(b) stomach
Ans: (a) 2nd portion of the duodenum
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Until recently, acquired immunity was thought to only occur in jawed vertebrates. Which of the following observations suggest that this is NOT the case?
a. Phenoloxidase activity enables hemocytes to form an impermeable wall of melanin around an infecting pathogen. b. Invertebrate immune cells secrete an IL-1 like compound. c. Invertebrates produce lectins, which coat bacterial cells, priming them for phagocytosis. d. Copepods become resistant to tapeworms after an initial exposure. e. None of these.
The abdominal cavity is _____ to the pelvic cavity.
Fill in the blank(s) with the appropriate word(s).
Which of the following would not be classified as a lymphatic structure?
A) pancreas B) spleen C) tonsils D) Peyer's patches of the intestine
Nutrients necessary for health that human cells cannot synthesize are called
______. Fill in the blank(s) with correct word