Science 9 Exam Review

What is the primary function of the respiratory system?

• To digest food.
• To regulate body temperature.
• To circulate blood.
• To facilitate gas exchange.

What type of blood cells transport oxygen throughout the body?

• White blood cells
• Platelets
• Plasma
• Red blood cells

What role do alveoli play in the respiratory system?

• Alveoli help in the filtration of air before it enters the lungs.
• Alveoli are responsible for producing mucus in the lungs.
• Alveoli play a crucial role in gas exchange in the respiratory system.
• Alveoli are involved in the regulation of blood pressure.

How does the heart assist in circulation?

• The heart filters toxins from the blood.
• The heart produces hormones that regulate blood flow.
• The heart stores excess blood for later use.
• The heart assists in circulation by pumping blood to deliver oxygen and nutrients to the body and remove waste.

How does oxygen enter the bloodstream from the alveoli?

• Oxygen is pumped into the bloodstream by the heart.
• Oxygen enters the bloodstream from the alveoli by diffusion.
• Oxygen is absorbed by the blood cells in the stomach.
• Oxygen enters the bloodstream through the skin.

How does blood flow from the lungs to the heart?

• Blood flows from the lungs to the heart via the pulmonary veins into the left atrium.
• Blood travels from the lungs to the heart through the inferior vena cava.
• Blood is pumped from the lungs directly into the right ventricle.
• Blood flows from the heart to the lungs via the aorta.

If a person has a blocked artery, how does this impact blood flow?

• Blood flow is increased significantly.
• Blood flow is reduced or obstructed.
• Blood flow remains unchanged.
• Blood flow is redirected to other arteries.

When a person exhales, how does the body remove carbon dioxide effectively?

• The body removes carbon dioxide by exhaling it from the lungs.
• The body stores carbon dioxide in the liver.
• Carbon dioxide is converted into oxygen in the stomach.
• The body absorbs carbon dioxide through the skin.

If someone has anemia, how does this affect their energy levels?

• Anemia causes a boost in energy due to increased red blood cell production.
• Anemia increases energy levels by enhancing oxygen delivery.
• Anemia has no effect on energy levels at all.
• Anemia typically causes decreased energy levels due to reduced oxygen delivery to the body's tissues.

Which activity can improve cardiovascular health?

• Weightlifting
• Yoga
• Aerobic exercise
• Meditation