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Eighth Grade (Grade 8) Respiration, Digestion, and Excretion Questions

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Grade 8 Respiration, Digestion, and Excretion
What percentage of the air we breathe is nitrogen?
  1. 100%
  2. 78%
  3. 16%
  4. 25%
Grade 8 Respiration, Digestion, and Excretion
The duodenum, jejunum, and ileum are components of the
  1. stomach.
  2. small intestine.
  3. large intestine.
  4. appendix.
Grade 8 Respiration, Digestion, and Excretion
The stomach walls agitate the bolus, then juices from the stomach break it down.
  1. True
  2. False
Grade 8 Respiration, Digestion, and Excretion
Chyme is churned by the stomach walls and degraded by the stomach juices.
  1. True
  2. False
Grade 8 Respiration, Digestion, and Excretion
What is the urethral opening?
  1. opening through which urine leaves the body
  2. entrance to the uterus
  3. place where conception occurs
  4. passageway from the ovary to the Fallopian tube
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