Bone cells called __________ break down bone by secreting hydrochloric acid and enzymes that dissolve the matrix
A. osteoprogenitor cells
B. osteoid cells
C. osteocytes
D. osteoclasts
E. osteoblasts
D
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A virus is ______ than a bacterial cell, and a virus is composed of ________.
A. larger; nucleic acid within a protein capsid. B. smaller; a eukaryotic cell with a cell wall. C. smaller; nucleic acid within a protein capsid. D. larger; a eukaryotic cell with a cell wall.
How many erythrocytes are in each milliliter of blood?
a. 50 million b. 500 million c. 1 billion d. 5 billion e. 15 billion
A pacemaker that appears unexpectedly at an abnormal site in the heart muscle is called a(n) ________
A) Heart muscle cannot serve as a pacemaker. B) supplemental rhythmic center C) ectopic pacemaker D) extrasystole
Which of the following is NOT an example of a draft animal?
a. elephant c. goat b. buffalo d. camel