Download 1. Which organ excretes excess carbon dioxide from the blood? a

Name: ____________________________________
Class: _____________
Date: _____________
Lesson Assessment: Excretory System
1. Which organ excretes excess carbon dioxide from the blood?
a) liver
b) skin
c) kidney
d) lung
2. Which substance is excreted from both the kidneys and the skin?
a) heat
b) urea
c) carbon dioxide
d) bile
3. Jaundice, a condition that gives skin a yellow appearance, results from the inability of the liver to remove
bile from the body fluids. What accounts for the yellow appearance of the skin under this condition?
a) dehydration
b) high cholesterol concentration
c) recycled bile salts
d) hemoglobin breakdown products
4. Which term describes substances removed from blood through the kidneys?
a) blood cells
b) filtrate
c) plasma
d) proteins
5. What remains in the tubules of a kidney after reabsorption?
a) urine
b) bile
c) amino acids
d) ammonia
PAGE 1
Name: ____________________________________
Class: _____________
Date: _____________
Lesson Assessment: Excretory System
6. What is the relationship between the liver and the kidneys in the passage of substances through the
excretory system?
a) Substances detoxified in the liver are later filtered through the kidneys.
b) Substances that escape detoxification in the liver are filtered in the kidneys.
c) Substances reabsorbed from the kidneys move directly to the liver.
d) Substances filtered through the kidneys are later detoxified in the liver.
7. What happens when salt concentration reaches its threshold level in the kidney?
a) Salt is no longer reabsorbed.
b) Salt is broken down into sodium and chlorine.
c) Salt concentration in urine diminishes.
d) Salt is reabsorbed at a greater rate.
8. What happens when substances from urine crystallize in the urinary tract?
a) Kidney stones form, blocking the flow of urine to the bladder.
b) Bile forms and passes to the small intestine.
c) The crystallized substances are too large to be reabsorbed into the bloodstream.
d) The substances block filtration.
9. Which function below is LEAST likely to occur in the liver?
a) chemical conversion and filtration of drugs
b) removal of particulate matter and harmful bacteria
c) release of antidiuretic hormone into the bloodstream
d) conversion of toxic ammonia to urea
10. What enables the reabsorption of glucose from the kidneys?
a) high blood sugar
b) osmosis
c) the absence of amino acids
d) ATP
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ANSWER KEY
1. d
2. b
3. d
4. b
5. a
6. a
ANSWER KEY Page 1
7. a
8. a
9. c
10. d