Approximately the last 15 cm of the digestive tract is the
A) anus.
B) anal canal.
C) rectum.
D) sigmoid colon.
E) rectal column.
Answer: C
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Blood returning to the heart from the systemic circuit first enters the
A) right atrium. B) right ventricle. C) left atrium. D) left ventricle. E) conus arteriosus.
B cells:
a. spend time developing in the thymus b. have specific antibodies in their cell membranes c. are responsible for cell-mediated immunity d. both A and C above
Parasympathetic stimulation of the ciliary muscles allows one to see close-up objects.
Answer the following statement true (T) or false (F)
Which of the following tissues is avascular and composed of tightly packed cells with little extracellular material?
A. Epithelial tissue B. Hyaline cartilage C. Osseous tissue D. Skeletal muscle tissue E. Nervous tissue