During exercise, the most significant factor affecting the pH of body tissues is the production of __________.
A) organic acids.
B) lactic acid.
C) hydrochloric acid.
D) carbon dioxide.
E) ketone bodies.
D) carbon dioxide.
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The hypoblast layer of the blastodisc is made of
A. cuboidal cells and forms during the pre-embryonic period. B. cuboidal cells and forms during the fetal period. C. columnar cells and forms during the morula stage. D. columnar cells and forms during gastrulation.
A hormone whose effects last a long time has a ________ half-life.
Fill in the blank(s) with the appropriate word(s).
Two types of phagocytic cells involved in tissue repair are
A) fibroblasts and chondrocytes. B) epithelial cells and fibroblasts. C) neutrophils and macrophages. D) clots and scabs. E) dead cells and live cells.
The exchange of oxygen and carbon dioxide between the air in the alveoli and blood in the lungs is called
A. cellular respiration. B. systemic respiration. C. internal respiration. D. external respiration. E. ventilation.