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Ninth Grade (Grade 9) Respiration, Digestion, and Excretion Questions

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Grade 9 Respiration, Digestion, and Excretion
Why does hydrochloric acid in the stomach not dissolve the stomach wall?
  1. A mucus layer protects the stomach wall.
  2. The hydrochloric acid is not high in volume.
  3. The acid is not strong enough to harm the stomach.
  4. All of the above.
Grade 9 Respiration, Digestion, and Excretion
The lungs consist of what kinds of tissue?
  1. epithelial and muscular
  2. connective and nervous
  3. epithelial and nervous
  4. epithelial and connective
Grade 9 Respiration, Digestion, and Excretion
What organ creates bile?
  1. liver
  2. stomach
  3. gallbladder
  4. small intestine
Grade 9 Respiration, Digestion, and Excretion
The functional unit of the kidney is the
  1. renal vein.
  2. adrenal gland.
  3. nephrotite.
  4. nephron.
Grade 9 Respiration, Digestion, and Excretion
The average adult human                 is over 6 meters in length.
  1. duodenum
  2. pancreas
  3. small intestine
  4. large intestine
Grade 9 Respiration, Digestion, and Excretion
Where does food go immediately after it leaves the stomach?
  1. liver
  2. gallbladder
  3. large intestine
  4. small intestine
Grade 9 Respiration, Digestion, and Excretion
Which function is NOT performed by the kidneys?
  1. maintenance of blood pH
  2. regulation of blood volume
  3. decomposition of amino acids
  4. removal of toxins from the blood
Grade 9 Respiration, Digestion, and Excretion
What are released in the stomach to break down food?
  1. alkalines
  2. bacteria
  3. enzymes
  4. energy molecules
Grade 9 Respiration, Digestion, and Excretion
Chemical reactions in the liver are catalyzed by
  1. enzymes.
  2. nephrons.
  3. nucleic acids.
  4. ribosomes.
Grade 9 Respiration, Digestion, and Excretion
What chemical substances do organisms need to build tissues and carry out life functions?
  1. vitamins
  2. nutrients
  3. calcium
Grade 9 Respiration, Digestion, and Excretion
Which structure is found between the esophagus and the stomach?
  1. sphincter
  2. larynx
  3. gall bladder
  4. gastrointestinal tract
Grade 9 Respiration, Digestion, and Excretion
What organ produces bile?
  1. gall bladder
  2. liver
  3. pancreas
  4. spleen
Grade 9 Respiration, Digestion, and Excretion
Which pair of letters in the diagram represents parts of the upper gastrointestinal tract?
Digestive System
  1. C and K
  2. D and F
  3. E and I
  4. L and M
Grade 9 Respiration, Digestion, and Excretion
Inorganic molecules that perform vital functions in the body are called
  1. lipids.
  2. proteins.
  3. vitamins.
  4. minerals.
Grade 9 Respiration, Digestion, and Excretion
The main function of the large intestine is to remove water from waste.
  1. True
  2. False
Grade 9 Respiration, Digestion, and Excretion
Why does the liver filter out excess amino acids from the blood?
  1. Amino acids are toxic.
  2. Amino acids cannot be stored.
  3. Amino acids are needed to detoxify ammonia.
  4. Amino acids spontaneously decompose into ammonia.
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