Digestive and Excretory Review

What is the main function of the digestive system?

• A. to remove wastes found in the blood

• B. to break down food so that it can be used by the body

• C. to transport important nutrients to all parts of the body

• D. to communicate signals between distant parts of the body

What is the main function of the small intestine?

• A. to mechanically break down food into tiny pieces

• B. to produce bile that breaks down proteins in food

• C. to store waste before it is eliminated from the body

• D. to absorb the nutrients from food into the bloodstream

Which answer lists the digestive system organs in the correct order?

• A. mouth (A), esophagus (B), small intestine (C), stomach (D), large intestine (E)

• B. mouth (A), esophagus (B), stomach (C), large intestine (D), small intestine (E)

• C. mouth (A), esophagus (B), stomach (C), small intestine (D), large intestine (E)

• D. mouth (A), stomach (B), esophagus (C), small intestine (D), large intestine (E)

When he eats, Eddie chews his food carefully. Which of these explains what Eddie is doing as his teeth crush the food into small pieces?

• A. He is absorbing nutrients.

• B. He is chemically digesting his food.

• C. He is mechanically digesting his food.

• D. He is mixing his food so that it can pass directly to the large intestine.

Stomach acid and saliva are liquids that are found in the digestive system. Which of the following best describes the function of these liquids?

• A. increasing oxygen levels

• B. creating larger molecules

• C. chemical digestion

• D. mechanical digestion

Urine flows out of the kidneys through narrow tubes called

• Gallbladder
• Ureter
• Nephrons
• Urethra

What is the main function of the excretory system?

• A. to remove waste from the body, maintaining homeostasis

• B. to remove oxygen from the body

• C. to obtain oxygen and transport it to all tissues

• D. to break down nutrients into smaller molecules, maintaining homeostasis

A group of dentists wants to know whether different drinks cause tooth decay. They use fake teeth that are made from the same material as real teeth. They use three liquids: milk, orange juice, and soda. Once a week they measure the level of tooth decay. What is the dependent variable in this investigation?

• A. type of liquid

• B. amount of tooth decay

• C. fake and real teeth

• D. number of liquids

8. The urinary system shown below is part of the excretory system.  How the urinary system interact with the cardiovascular system?

• A.  the urinary system pushes blood back to the heart
• B.  the urinary system creates blood for the cardiovascular system
• C.  the urinary system helps remove waste from the blood
• D.  the urinary system help keep the body warm

Why is the respiratory system considered to be part of the excretory system?

• A. lungs take in O2

• B. blood moves in and out of the lungs

• C. when the heart beats, blood is pumped to the body

• D. lungs release CO2 when you exhale