How does the structure of a lymph node allow lymphocytes and macrophages to perform their protective function?
What will be an ideal response?
Macrophages and lymphocytes are located in lymph nodes. Macrophages ingest microorganisms and cellular debris. Lymphocytes monitor the lymphatic stream for the presence of antigens and mount an immune response. Because there are fewer efferent vessels draining the node than afferent vessels that feed it, the flow of lymph through the node stagnates somewhat, allowing time for the lymphocytes and macrophages to work.
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Which enzyme is produced by the salivary glands and begins the chemical digestion of carbohydrates?
A. Salivary amylase B. Salivary maltase C. Salivary sucrase D. Salivary lactase
Which of the following hormones stimulates the development of megakaryoblasts?
a) Erythropoietin b) Thrombopoietin c) Nitric oxide d) Human growth hormone e) Heparin
The word __________________ refers to a description of quality without the use of numbers. ________________________________________
Fill in the blank(s) with the appropriate word(s).
The most correct classification of an epithelial tissue consisting of many layers of cells, in which the outer layers are flat and thin, and the basal layers are cuboidal or columnar is
A) simple columnar epithelium. B) pseudostratified epithelium. C) stratified squamous epithelium. D) transitional epithelium. E) simple squamous epithelium.