Nervous, Circulatory, & Respiratory Systems Test 2025

Which of the following BEST explains why “breaking down carbohydrates into glucose” is NOT a function of the cardiovascular system?

• Because the circulatory system only moves gases, not nutrients.

• Because the circulatory system makes glucose instead of using it.

• Because this process occurs in the digestive system before nutrients enter the bloodstream.

• Because the heart and blood vessels store food, not transport it.

Substances your body needs are carried to the cells by the blood. Which statement BEST explains how blood performs this function?

• Blood keeps the body's temperature stable by storing food.

• Blood uses white blood cells to store oxygen for later use.

• Blood carries oxygen and nutrients through vessels to reach all body cells.

• Blood digests nutrients and turns them into glucose.

Blood vessels that are oxygen rich and carry blood away from the heart are called arteries. Which statement BEST explains how arteries are different from veins?

• Arteries carry blood to the heart, while veins carry it away.

• Arteries carry oxygen-rich blood away from the heart, while veins carry oxygen-poor blood back to the heart.

• Arteries and veins both carry oxygen-rich blood in the same direction.

• Arteries are thin-walled and contain valves to prevent backflow, while veins are thick-walled.

If a person’s red blood cell count is low, how might this affect their body’s ability to function?

• The body would receive less oxygen, causing fatigue and decreased energy production in cells.

• The person would lose their ability to fight infections.

• The body would stop producing nutrients from food.

• The person’s blood pressure would immediately increase.

Tags

NGSS.MS-LS2-1

During a lab experiment, two samples of blood are observed: one forms a scab quickly after being exposed to air, while the other continues to flow freely. What can you conclude about the second sample, and why?

• It has too many white blood cells, blocking the flow of blood.

• It lacks red blood cells, preventing oxygen from being delivered.

• It lacks plasma, so nutrients cannot be transported.

• It likely lacks platelets, so clotting cannot occur to stop bleeding.

Exercise is important for cardiovascular health because it strengthens the heart muscle. Which statement BEST explains how this benefits the circulatory system?

• A stronger heart slows blood flow, allowing more waste to build up.

• A stronger heart increases blood pressure permanently.

• A stronger heart pumps blood more efficiently, improving oxygen delivery to the body.

• A stronger heart stores more oxygen for energy use.

The atria are the chambers of the heart that receive blood. Which statement BEST explains the difference between the atria and ventricles?

• The atria are responsible for oxygenating blood, while the ventricles filter it.

• The atria pump blood to the lungs, while the ventricles receive it from the body.

• The atria and ventricles both pump blood away from the heart.

• The atria receive blood returning to the heart, while the ventricles pump blood out to the lungs or the rest of the body.

Neurons carry messages between the brain and body. Which statement BEST explains how this process helps the body respond to its environment?

• Neurons transport oxygen and nutrients through the bloodstream.

• Neurons send electrical signals that allow the body to react quickly to stimuli.

• Neurons store waste and send it out of the body.

• Neurons digest food to give the brain energy.

Tags

NGSS.MS-LS1-8

A person's white blood cell count rises when they have an infection. What does this increase show about the body's response?

• The circulatory system is slowing down blood flow.

• The respiratory system is producing more oxygen.

• The immune system is working to fight off disease-causing organisms.

• The digestive system is absorbing fewer nutrients.

Tags

NGSS.MS-LS1-3

During respiration, cells use oxygen to release energy from glucose. Which statement BEST explains what happens to the waste products that are produced?

• Carbon dioxide and water are stored in the heart for later use.

• Oxygen is released as waste, and glucose is reused.

• Carbon dioxide is carried to the lungs to be exhaled, and water is used or released by the body.

• Red blood cells produce carbon dioxide to help with digestion.

Tags

NGSS.MS-LS2-3