Respiratory Distress Syndrome (RDS) is a condition associated with premature babies who lack ________.
A. histamine
B. type I alveolar cells
C. a-antitrypsin
D. surfactant
Answer: D
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A fascicle is a
A) group of muscle fibers that are encased in the perimysium. B) layer of connective tissue that separates muscle from skin. C) group of muscle fibers that are all part of the same motor unit. D) group of muscle fibers and motor neurons. E) collection of myofibrils in a muscle fiber.
As the eye adjusts to focus on a near object, the cornea must change shape because the lens is unable to
Indicate whether this statement is true or false.
Carrier-mediated transport
a. involves a specific membrane protein that serves as a carrier molecule. b. always moves substances against a concentration gradient. c. always requires energy expenditure. d. two of these answers. e. all of these answers.
Which of the following muscles is the most active when doing push-ups?
A. Pectoralis minor B. Trapezius C. Pectoralis major D. Biceps brachii E. Latissimus dorsi