PTONHS FIRST

What is the role of the respiratory system in transporting oxygen?

• Directly carries oxygen to all the body's cells.

• Uses oxygen to produce energy for the body.

• Filters out oxygen from the air and releases it as waste.

• Absorbs oxygen from the air and transfers it to the circulatory system.

What important process occurs in the netlike structure labeled A?

• Oxygen and carbon dioxide are exchanged.

• The exchange of nitrogen and oxygen takes place.

• Oxygen and carbon dioxide fill into the bloodstream.

• The amount of nitrogen and carbon dioxide in the atmosphere remains constant.

The respiratory and circulatory systems work together to deliver oxygen to the body's cells. Which of the following BEST describes their coordinated actions?

• The respiratory system absorbs oxygen, which is then directly used by the body's cells.

• The circulatory system pumps oxygen-rich blood to the lungs, where it picks up carbon dioxide.

• The circulatory system filters oxygen from the air and delivers it to the respiratory system for use by the body.

• The respiratory system takes in oxygen, which is then transported by the circulatory system to cells throughout the body, while carbon dioxide is transported back to the lungs.

Which shows the correct path that describes the passage of blood originating in the left leg?

• Vena cava → left atrium → right atrium → lungs → left ventricle → right ventricle → aorta

• Vena cava → right atrium → right ventricle → lungs → left atrium → left ventricle → aorta

• Vena cava → right atrium → left atrium → lungs → right ventricle → left ventricle → aorta

• Vena cava → left atrium → left ventricle → lungs → right atrium → right ventricle → aorta

What gas is mainly taken into the lungs when a person breathes in?

• Helium

• Oxygen

• Nitrogen

• Carbon dioxide

Examine the diagram below, how does the structure and position of each heart chamber relate to its function in the circulation of blood through the heart and body?

• The atria are positioned below the ventricles to pump oxygenated blood directly to the brain.

• All heart chambers have the same structure and wall thickness because they perform similar functions in blood circulation.

• The right chambers are thicker because they handle oxygenated blood, while the left chambers are thinner as they only receive blood.

• The atria have thinner walls because they only receive blood, while the ventricles have thicker walls to pump blood either to the lungs or to the rest of the body.

Based on the illustration below, how do the respiratory and circulatory systems work together to remove carbon dioxide from the body?

• The respiratory system removes carbon dioxide, and the circulatory system is not involved.

• The circulatory system removes carbon dioxide, and the respiratory system is not involved.

• The systems work independently; the respiratory system expels carbon dioxide, and the circulatory system has no role in the process.

• Both are involved; the circulatory system transports carbon dioxide from cells to the lungs, gas exchange will happen, and the respiratory system expels it.

What is the main function of the diaphragm in the respiratory system?

• Produce sound

• Exchange gases in the blood

• Help air enters and exits the lungs

• Move air and food through the esophagus

Which of the following are involved in the process of breathing?

• Lungs only

• Heart and brain

• Trachea and stomach

• Nose, trachea, lungs, diaphragm

How would you explain environmental factors such as high altitude or air pollution could affect the coordinated function of the respiratory and circulatory systems, and what compensatory mechanisms the body might employ to maintain homeostasis?

• Environmental factors have no effect on the systems.

• The body cannot compensate for environmental factors.

• High altitude reduces oxygen availability, triggering increased breathing rate and heart rate.

• High altitude increases oxygen availability, causing a decrease in heart rate as air pollution improves lung function.