In which sites specifically would a pathogen or its antigens end up, and how would they be transported to these sites, if they (i) entered the body through a small wound in the skin, (ii) entered the body from the gut, or (iii) got into the bloodstream?
What will be an ideal response?
(i) Lymph nodes. The pathogen, and dendritic cells that have ingested the pathogen, are carried to the nearest lymph node in the afferent lymph. (ii) Gut-associated lymphoid tissues (GALT) such as Peyer's patches. Pathogens enter GALT via specialized cells (M cells) in the gut epithelium. (iii) Spleen. Pathogens circulating in the blood enter the spleen directly from the blood vessels that feed it.
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To develop the cardiorespiratory system, the heart muscle has to be
a. relaxed. b. overloaded. c. stretched. d. underloaded.
What is the primary difference between a large motor unit and a small motor unit?
A. A large motor unit would only be found in large muscles. B. The number of muscle fibers innervated by a single motor nerve. C. A small motor unit will only be found in slow twitch muscles. D. The number of slow twitch muscles vs. fast twitch muscles.
The concept of energy balance refers to the relationship between
A. calories consumed and calories expended. B. body weight and body composition. C. physical activity and resting metabolism. D. body image and body composition.
Since the first case was diagnosed in 1981, more than 20 million people have died from ________.
Fill in the blank(s) with the appropriate word(s).