This figure shows the muscles of facial expression. What muscle does number 1 indicate?
A. Nasalis
B. Orbicularis oculi
C. Platysma
D. Epicranius
E. Procerus
Answer: C
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Explain the term genetic code. What does it code for? What are the letters of the code?
What will be an ideal response?
Which of the following is incorrect pertaining to the thoracic sympathetic trunk?
A) It is in continuity with the cervical and lumbar sympathetic trunks. B) It lies against the heads of the ribs in the superior part of the thorax. C) It only supplies postganglionic sympathetic fibers to thoracic viscera. D) It gives rise to the greater, lesser, and least splanchnic nerves. E) It has white and gray rami at each level.
The epinephrine and norepinephrine released by the adrenal medullae
A) has a relatively long duration of activity because it may be inactivated by enzymes in the target tissues only. B) is all inactivated by enzymes in the bloodstream. C) provides for localized effects of suprarenal stimulation. D) affects its targets for only a few seconds. E) None of the answers are correct.
Which system engages in mass activation?
A. Parasympathetic nervous system B. Sympathetic nervous system