The tonsils are part of the ____________________ system
Fill in the blank(s) with correct word
immune or lymphatic
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Which of the following structures sets the pace of heart contraction?
atrioventricular bundle SA node bundle branches AV node
Low PO2 and high PCO2 in the alveoli will cause:
A. constriction of pulmonary capillaries and bronchioles. B. dilation of pulmonary capillaries and bronchioles. C. constriction of pulmonary capillaries and dilation of bronchioles. D. dilation of pulmonary capillaries and constriction of bronchioles.
The internal environment
a. is in direct contact with the body's cells. b. consists of the intracellular fluid. c. must be maintained at absolutely unchanging composition, temperature, and volume for survival of the body. d. is in direct contact with the body's cells and consists of the intracellular fluid. e. all of these answers.
The potential space between the serous membranes surrounding each lung is known as the pleural ________.
Fill in the blank(s) with the appropriate word(s).