Which of the following is not a function of the respiratory system?
A. It allows exchange of oxygen and carbon dioxide between blood and air.
B. It contributes to maintenance of pH balance.
C. It helps to expel abdominal contents during defecation and childbirth.
D. It helps to transport gases to tissues.
E. It permits vocalizations.
D. It helps to transport gases to tissues.
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The egg, or ovum, is more correctly called
A. an oogonium. B. a primary oocyte. C. a zygote. D. a secondary oocyte.
Lipid is concentrated with the cells of the
A) hypodermis. B) dermis. C) cornified region. D) stratum granulosum. E) stratum spinosum.
What is the middle layer of a blood vessel called?
A. Tunica interna B. Tunica externa C. Tunica adventitia D. Tunica media E. Tunica intima
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.