Describe why the prognosis of cancer is best when there is no detectable spread from the region of the primary tumor to the lymph nodes
What will be an ideal response
Cancer cells that break free from the primary tumor can metastasize via the lymph system. Even if a lymph node is 99% effective in trapping malignant cells, given the ability of a tumor to continuously shed cells into lymphatic capillaries, that still means that 100 out of every 10,000 cells get through. So the presence of any trapped cells in a lymph node is a warning that a few others may have escaped entrapment.
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Substances that are reabsorbed by passing between epithelial cells of the tubular walls undergo _________ transport
Fill in the blank with correct word.
Diffusion rate is directly proportional to ________ and ________.
Fill in the blank(s) with the appropriate word(s).
This flap of elastic cartilage forms a lid over the larynx and prevents food from entering it during swallowing
A) cuneiform B) thyroid C) cricoid D) epiglottis
Microscopic folds that extend from the apical surface of certain epithelia to increase the surface area for absorption and secretion are called
A. desmosomes. B. flagella. C. microvilli. D. cilia. E. mucous ridges.