A child swallows a tack, which penetrates the wall of the intestine. Describe the layers of the gut wall that the tack will penetrate, from the inside to the outside.
What will be an ideal response?
Answer: First, the tack will penetrate the epithelium that lines the gut, then the lamina propria, which is connective tissue, then the muscularis mucosa, which is smooth muscle, then the submucosal plexus (neurons) and the major circular and longitudinal smooth muscle layers, then the myenteric plexus, another smooth muscle layer, and then the serosa, a layer of connective tissu
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Congenital hemolytic anemia is
A. when destruction of erythrocytes is more rapid than normal. B. when there is an inherited anemia associated with a defect in iron uptake. C. caused by a failure of the body to absorb Vitamin B12. D. characterized by a large number of immature, nucleated cells. E. characterized by significantly decreased formation of erythrocytes and hemoglobin due to defective red bone marrow.
Within lymph nodes, fixed macrophages and dendritic cells remove at least ________ percent of antigens arriving in lymph.
A) 10 B) 25 C) 50 D) 80 E) 99
Identify three sources where research articles can be found
What will be an ideal response?
________ are secreted by one cell into the tissue fluid, diffuse to nearby cells in the same tissue, and stimulate their physiology
A) Paracrines B) Hormones C) Neurotransmitters D) Neuromodulators E) Parahormones