The first event in inspiration is
A) lung inflation.
B) atmospheric pressure forces air into the respiratory tract.
C) decreased intra-alveolar pressure.
D) the diaphragm moves downward and the external intercostal muscles contract.
D
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The outermost layer of the epidermis is the stratum basale and the innermost layer is the stratum corneum.
Answer the following statement true (T) or false (F)
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.
All hormones are eventually inactivated by enzymes in the pancreas, kidneys, lymph, or target cells
a. True b. False Indicate whether the statement is true or false
If an atom has 8 protons and 8 neutrons in its nucleus, and 8 orbiting electrons, its atomic number would be ________.
A. 8 B. 16 C. 12 D. 24