The intrinsic nerve plexuses
a. produce spontaneous depolarization of the muscle cells in the wall of the digestive tract
b. are located in the mucosa
c. coordinate local activity in the digestive tract
d. have characteristics a and c
e. have none of the above characteristics
C
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Answer the following statements true (T) or false (F)
1 A single layer of thin, flat cells that lines the heart and all blood vessels is called endothelium. 2 A single layer of thin, flat cells that lines the ventral body cavities is called mesothelium. 3 Multiple layers of cells, found where mechanical stresses are severe is called simple cuboidal epithelium. 4 Cuboidal cells resemble little hexagonal boxes, which appear square in typical sectional views. 5 Transitional cells are relatively tall, slender cells with nuclei in a narrow band close to the basement membrane.
During forceful expiration,
a. accessory expiratory muscles contract b. internal intercostals contract c. abdominal muscles contract d. ribs are brought closer together e. all of the above occur
The part of the feedback mechanism that processes information, relates it to other information, and makes a decision of action is the receptor
Indicate whether the statement is true or false.
The rungs of the DNA ladder are composed of
A. glucose-phosphate chain. B. sugar-phosphate chain. C. adenine-ribose chain. D. nitrogen base pairs.