Urine ejection cannot occur unless which event(s) takes place?
A) Both the internal and external urethral sphincters are contracted.
B) The internal urethral sphincter is relaxed, and the external urethral sphincter is contracted.
C) The internal urethral sphincter is contracted, and the external urethral sphincter is relaxed.
D) Only the internal urethral sphincter is contracted.
E) Both the internal and external urethral sphincters are relaxed.
E) Both the internal and external urethral sphincters are relaxed.
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The medial pathway of the indirect motor pathway consists of three groups of tracts. The one that helps to regulate muscular activity that helps maintain balance during sitting, standing, and walking is the
A. vestibulospinal tract. B. tectospinal tract. C. reticulospinal tract.
Nerves that pass through the sympathetic chain without synapsing innervate which structure?
A. Heart B. Stomach C. Sweat glands D. Lungs E. Piloerector muscles
Which one of the following is NOT true of lung cancer?
A) It is the leading cause of cancer deaths in the U.S. B) It slows down the movement of cilia. C) It only occurs in smokers. D) Most types of lung cancer are very aggressive. E) Lung cancers often metastasize rapidly and widely.
The forceful expulsion of semen from the urethra caused by contraction of smooth muscle in the urethra and skeletal muscle surrounding the base of the penis is called
A. ejaculation. B. neutralization. C. physiological contracture. D. emission. E. orgasm.