Circulatory System

During a school science fair, Luna demonstrates a model of the human body's circulatory system. What is the main function of the heart in her model?

• Nutrient absorption in the intestine

• Blood pumping through the body

• Production of hormones

• Regulation of body temperature

During a biology class, Maya is asked to describe the structure of the human heart and mention the four main chambers as part of her presentation. How should she respond?

• The heart has two atria (upper) and two ventricles (lower).

• The heart has three atria and one ventricle.

• The heart has four atria and no ventricles.

• The heart has one ventricle and three atria.

During a biology class, Michael learns that certain blood vessels are responsible for carrying blood from the heart to the rest of the body. Which type of blood vessels perform this function?

• arteries

• nerves

• capillaries

• veins

During a school science fair, Benjamin explains the difference between arteries and veins in terms of function and structure. How does he describe them?

• Arteries have valves to prevent blood reflux.

• Arteries carry deoxygenated blood from the heart to the body tissues.

• Arteries carry oxygenated blood from the heart to the body tissues, while veins carry deoxygenated blood from the body tissues back to the heart.

• Veins carry oxygenated blood from the body tissues back to the heart.

During a marathon, how do capillaries help runners like Oliver and Avery maintain their energy and remove waste products?

• Capillaries are the largest blood vessels, supplying muscles with large volumes of blood.

• Capillaries transport blood directly from the heart to the muscles, providing them with oxygen.

• Capillaries do not play an important role in providing muscles with nutrients or removing waste during a marathon.

• Capillaries are the smallest and thinnest blood vessels. They allow the exchange of nutrients, oxygen, carbon dioxide, and waste products between the blood and the muscles, helping runners like Oliver and Avery maintain their energy and remove waste products.

During a biology class, Grace, Luna, and Olivia are learning about the human body. They are curious about the basic composition of blood and its main components. What do they discover?

• Serum, red blood cells, white blood cells, and platelets

• Plasma, red blood cells, white blood cells, and platelets

• Plasma, red blood cells, stem cells, and platelets

• Plasma, red blood cells, white blood cells, and lymphocytes

During a marathon, how do Luna's red blood cells help her body?

• Produce antibodies

• Transport oxygen and carbon dioxide

• Produce insulin

• Regulate body temperature

During a school science fair, Aria and David presented a project on the immune system. They explained two types of white blood cells and their functions. What are these cells?

• Monocytes and basophils

• Macrophages and erythrocytes

• Eosinophils and platelets

• Neutrophils and lymphocytes

During a soccer game, Olivia falls and gets a scrape. What are platelets and what is their function in helping Olivia's scrape stop bleeding?

• Platelets are cell fragments that help in blood clotting by adhering to the site of injury and forming a plug to stop bleeding.

• Platelets are proteins that help regulate blood pressure.

• Platelets are red blood cells that transport oxygen in the blood.

• Platelets are immune system cells that fight infections in the blood.

Imagine Ethan is explaining the process of blood circulation in the human body to Michael, starting from when the blood leaves the heart until it returns to it. How would Ethan describe this process?

• The blood leaves the heart through the aorta, is distributed throughout the body through the arteries, reaches the capillaries for the exchange of nutrients and waste, returns to the heart through the superior and inferior vena cava, passes through the atria and ventricles to be pumped to the lungs and body again.

• The blood is distributed throughout the body through the capillaries

• The blood leaves the heart through the pulmonary artery

• The blood returns to the heart through the arteries