The heart has four chambers. The two upper chambers are called atria, and the two lower chambers are called ventricles. What are the two lower chambers called?
- AVentricles
- BValves
- CAtria
- DCoronary arteries
The heart has four chambers. The two upper chambers are called atria, and the two lower chambers are called ventricles. What are the two lower chambers called?
Dogs have a much stronger sense of smell than humans. Because of this, they are trained to help find missing people and to detect things such as drugs in airports. Why are dogs used to find missing people?
A hospital map key shows: blue square = lift; green circle = toilet; red cross = emergency department; yellow star = café. What does a green circle mean on the map?
Paragraph: “Exercise has many benefits. It strengthens the heart and lungs. It helps control weight. It can also improve mood and sleep.” Which sentence is the topic sentence?
“The lungs contain millions of tiny air sacs called alveoli. Here, oxygen passes into the blood, and carbon dioxide passes out to be breathed away.” What happens in the alveoli?
Paragraph: “Many students struggle to focus at home. Phones buzz, family members talk, and the TV is often on. A quiet library can be a better place to study.” What is the author’s main point?
“In one study, people who were told a pill would ease their pain reported less pain, even though the pill contained no medicine.” What does this study illustrate?
The author writes: “Some claim that video games make children violent. Yet violent crime among young people has fallen in many countries during the same years that video games became popular.” What is the author trying to show?
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