Which of the following is true about paranasal sinuses?
A) Paranasal sinuses open into the oral cavity.
B) Paranasal sinuses enhance the resonance of the voice and lighten the skull.
C) Paranasal sinuses contain passages acting as one-way valves.
D) Paranasal sinuses are found in maxillary, ethmoid, and lacrimal bones.
B) Paranasal sinuses enhance the resonance of the voice and lighten the skull.
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The major functions of the ________ system are temperature control and protection of the body from the external environmental hazards.
A) digestive B) cardiovascular C) urinary D) respiratory E) integumentary
The rhomboid muscle is named for its
A. size. B. action. C. shape. D. fiber orientation. E. origin.
Which of the following is correctly matched?
A. Second stage of labor - ends with cervix dilation to maximum B. Third stage of labor - placenta expelled from uterus C. First stage of labor - Fetus exits vagina
Tom suffers from hypertension (high blood pressure). Which of the following might help deal with his problem?
A) a drug that blocks alpha-1 receptors in smooth muscle B) a drug that blocks alpha-2 receptors in adipose tissue C) a drug that increases cAMP levels in cardiac muscle tissue D) a drug that blocks beta receptors in cardiac muscle tissue E) a drug that blocks alpha-1 receptors in smooth muscle and blocks beta receptors in cardiac muscle tissue