Coronary vessels are open when the heart is
A. relaxed.
B. contracting.
Answer: A
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Tough, flexible fibers that resist stretching and are abundant in tendons and bones are __________ fibers.
Fill in the blank(s) with the appropriate word(s).
The kidney has six roles in homeostasis. Please describe them
What will be an ideal response?
Which of the following is true of the bony matrix of the skeleton as people age?
A) The proportion of collagen fibers in the matrix increases with age. B) Its composition remains constant throughout life. C) Its mineral content diminishes as a normal part of aging. D) It gains calcium carbonate while losing calcium phosphate. E) None of the answers are correct.
Without pulmonary surfactant,
a. small alveoli would tend to collapse. b. larger alveoli would tend to empty into smaller alveoli. c. all alveoli would be easier to inflate. d. the surface tension in the alveoli would be reduced. e. inspirations would be easier.