Describe the role of macrophages in protecting the body against disease.
What will be an ideal response?
Macrophages do a number of things. First, these actively mobile cells engulf any foreign bacteria they encounter. Second, they activate the brain to change the temperature of the body, if need be. Third, they activate the immune response by releasing interleukin-1 after identifying viral markers on MHC proteins. Interleukin-1 activates the helper T cells which, in turn, activate both T and B cells. Lastly, macrophages are the cleanup crew and get rid of dead cells and debris after an infection is over.
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Digestive wastes of the male Ascaris roundworm exit the body through the
(a) anus. (b) cloaca. (c) mouth. (d) excretory pore.
Which type of receptor is used by a ratto detect pheromones from a potential mate?
a. mechanoreceptors b. photoreceptors c. chemoreceptors d. thermoreceptors e. nociceptors
What is the "2R hypothesis?" What evidence is there for it?
What will be an ideal response?
Negative staining facilitates the visualization of bacterial capsules that are intensely stained by the procedure.
Answer the following statement true (T) or false (F)