What is diapedesis?
The movement of white blood cells through blood vessel walls.
The formation of platelets from megakaryocytes.
The squeezing of red blood cells through narrow capillaries.
The filling of red blood cells with hemoglobin.
The Correct Answer is A
A. The movement of white blood cells through blood vessel walls: diapedesis (transmigration) is when leukocytes squeeze between endothelial cells to leave the bloodstream and enter tissues.
B. The formation of platelets from megakaryocytes: that process is thrombopoiesis (platelet production), not diapedesis.
C. The squeezing of red blood cells through narrow capillaries: RBCs deform to pass through capillaries, but that is not called diapedesis.
D. The filling of red blood cells with hemoglobin: hemoglobin synthesis and RBC maturation are separate processes, not diapedesis.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. In the mouth: little to no chemical digestion of nucleic acids occurs in the mouth.
B. In the small intestine: pancreatic nucleases (DNase, RNase) and brush-border enzymes in the small intestine chemically digest nucleic acids into nucleotides and bases.
C. In the large intestine: the large intestine is primarily for water absorption and microbial fermentation, not major nucleic acid digestion.
D. In the stomach: the stomach mainly digests proteins (pepsin) and does not significantly chemically digest nucleic acids.
Correct Answer is D
Explanation
A. Minute ventilation is the volume of air that reaches the alveoli each minute. Alveolar ventilation is the volume of air that moved into the respiratory passages each minute. Reversed definitions.
B. Minute ventilation is the number of breaths taken each minute. Alveolar ventilation is the amount of air in the alveoli each minute. Minute ventilation is volume, not rate.
C. Minute ventilation is the volume of air moved into the upper respiratory tract each minute. Alveolar ventilation is the volume of air moved into the lower respiratory tract each minute. Both definitions are wrong.
D. Minute ventilation is the volume of air moved into the respiratory passages each minute. Alveolar ventilation is the volume of air that reaches the alveoli each minute. Minute ventilation = tidal volume × respiratory rate; alveolar ventilation accounts for dead space.
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