The space within the mouth is known as the ________ cavity.
A. nasal
B. orbital
C. cranial
D. oral
Answer: D
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Each segment of lung tissue is divided into a number of ____ wrapped in elastic connective tissue with a lymphatic, an arteriole, a venule, and bronchioles from a terminal bronchiole
a. alveolus
b. meatus
c. septa
d. lobules
Collectively, the bones of the skull that protect the brain are called the _________.
Fill in the blank(s) with the appropriate word(s)
During the embryonic developmental stage, skeletal muscle fibers are derived from:
a. fibroblasts b. lymphoblasts c. connective tissue d. myoblasts e. microfilaments
An individual develops a cold from a co-worker. This is an example of ______ immunity
A. active artificial B. passive natural C. passive artificial D. active natural