The dried residues of fine droplets from mucus or saliva that harbor and transmit pathogen are
A. fomites.
B. mechanical vectors.
C. droplet nuclei.
D. biological vectors.
E. aerosols.
Answer: C
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In 1822, the Canadian fur trader Alexis St. Martin was accidentally shot with a musket. The shot entered his left chest, fractured a rib, damaged the lungs, lacerated the diaphragm, perforated the stomach, and finally exited his body. Amazingly he survived, but the hole in his belly never completely healed. This allowed Dr. William Beaumont direct access to his stomach for experiments, and led to his discovery of the importance of stomach acid in digestion. Which body cavities did the musket shot pass through?
A. The shot entered the dorsal cavity and exited through the ventral cavity. B. The shot entered the thoracic cavity and exited through the abdominopelvic cavity. C. The shot entered the thoracic cavity and exited through the pleural cavity. D. The shot entered the pericardial cavity and exited through the pleural cavity. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about the body cavities? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray?
Helper T cells secrete ____, which activate B cells and stimulate their proliferation
a. antigens b. allergens c. antibodies d. interferons e. interleukins
The corolla is made up of
a. sepals. b. petals. c. carpels. d. pollen grains. e. anthers
The structure indicated by the letter “B” above
represents a. actin. b. myofibril. c. myosin. d. myofilament. e. muscle fiber.