Question

read the passage and look at the graphic. then answer the question.
the human heart
the heart is one of the most important muscles in the body. it beats over 115,000 times and pumps about 2,000 gallons of blood every day. the heart is roughly the size of a fist in most adults. exercise and eating right are necessary for keeping the heart healthy. the heart has four chambers, or areas, and the valves act like doors that only allow blood to flow in one direction. blood enters the heart through veins, and it leaves the heart through arteries.
chambers of the human heart
what extra information does the diagram provide?
a which direction blood flows in
b how much blood the heart pumps
c what the four chambers are called
d what to do to keep the heart healthy

Explanation:

The passage mentions that the heart has four chambers but doesn't name them. A diagram of the heart's chambers would likely label what each of the four chambers is called. Option A (blood flow direction) is mentioned in the passage ("valves act like doors that only allow blood to flow in one direction"). Option B (how much blood the heart pumps) is given in the passage ("pumps about 2,000 gallons of blood every day"). Option D (what to do to keep the heart healthy) is stated in the passage ("Exercise and eating right are necessary for keeping the heart healthy").

Answer:

C. what the four chambers are called