If the skin formed as a simple epithelium during development, what result would you expect?
A. The skin would have increased transfer and improved water and gas homeostasis.
B. This would mildly decrease its protective function.
C. This would make the skin very fragile and impair its protective function.
D. This is the normal situation.
Answer: C
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Density-independent controls over population growth include ____
a. parasites b. temperature c. disease d. competition e. predation
The two MAJOR divisions of the nervous system are the
a. autonomic and peripheral systems. b. sympathetic and parasympathetic systems. c. cranial and spinal nerves. d. central and peripheral nervous systems. e. brain and spinal cord.
Oxygen kills some bacteria because of the production of _______
a. carbon dioxide b. oxygen free radicals c. a sodium cation d. water
Why is lymphatic tissue found all along the GI tract?
A) Different pathogens are activated at different points along the digestive tract, and the location of the lymphatic tissue allows the host to respond according to which pathogen is activating in that area. B) When an infection occurs, these lymphatic tissues are able to quickly stop digestion and the movement of the GI contents so that the infection doesn't spread throughout the body. C) Upon infection in a specific area of the GI tract, a response can quickly be delivered and flood the lumen of the GI tract in that region. D) When an infection occurs, these lymphatic tissues are able to quickly trigger an inflammatory response along the entire GI tract. E) Cells in these lymphatic tissues "sample" the environment by phagocytosis and present their findings to lymphocytes that may or may not need to initiate an immune response.