Which is TRUE about the pleural sac?
A. It is continuous with the atmosphere and protects the lungs from infection.
B. It is a closed sac surrounding each lung that contains only a tiny volume of lubricating fluid.
C. It is a closed, air-filled space surrounding both lungs that has a negative pressure compared to atmospheric pressure.
D. It is a closed sac surrounding each lung and contains a large volume of surfactant.
E. It is bounded by pleural membranes that are very thin, which allows for abundant gas exchange.
Answer: B
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Involution occurs because
a. FSH and LH levels rise b. uterine contractions strengthened the myometrium c. hCG levels fall d. of a fall in circulating estrogen and progesterone e. both (c) and (d)
What is the technical term for a gradual loss of bone that usually begins between ages 30 and 40?
A. Achondroplastic dwarfism B. Osteopenia C. Osteoporosis D. Rickets E. Osteomalacia
The volume of urine produced is regulated mainly by the activity of the ______________ portion of the renal tubule and collecting tubule
Fill in the blank(s) with the appropriate word(s).
Which of the following bones belongs in the axial skeleton?
A) clavicle B) phalanges C) fibula D) sternum