Answer the following questions true (T) or false (F)
1. The spleen is a primary lymphoid tissue.
2. Eosinophil granules contain diverse enzymes and antimicrobial toxins that are released into surrounding tissues in response to certain allergens and parasites.
3. Dendritic cells prevent the immune system from attacking self and from over-reacting to nonthreatening substances.
1. FALSE
2. TRUE
3. TRUE
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Place the following events of an inflammatory
event in response to bacterial infection in proper order. 1. activated complement binds to bacteria 2. capillary permeability increased 3. phagocytes engulf bacteria 4. mast cell receptors bind to bacterial antigens 5. signaling molecules cause arterioles to widen
a. 4-5-2-1-3 b. 4-3-1-2-5 c. 5-2-1-4-3 d. 1-3-4-2-5 e. 5-2-4-1-3
In its use in conservation efforts, lichens are classified as an example of a(n) ____
a. biological magnified species b. endangered species c. biodiverse species d. indicator species e. exotic species
A neuron sends a signal toward another neuron along its _____.
A. dendrites B. cell body C. axon D. ion channels
HEPA filters are able to filter many airborne viruses
a. true b. false