IGCSE Biology - Transport in mammals

What is the role of capillaries in the circulatory system?

• To facilitate the exchange of oxygen, carbon dioxide, nutrients, and waste between blood and tissues.

• To pump blood throughout the body.

• To store blood for later use.

• To produce red blood cells.

What is the function of red blood cells?

• To carry oxygen to the muscles.

• To fight infections in the body.

• To transport carbon dioxide away from the lungs.

• To regulate body temperature.

Name the blood vessel leaving the left ventricle and carrying blood to the body.

• Pulmonary Artery

• Aorta

• Superior Vena Cava

• Coronary Artery

What is the significance of the left atrium in the circulatory system?

• It pumps deoxygenated blood to the lungs.

• It receives oxygenated blood from the lungs.

• It regulates blood pressure in the arteries.

• It is responsible for the heartbeat rhythm.

What is the liquid portion of the blood that makes up 55% of total blood volume?

• Plasma

• Serum

• Hemoglobin

• Platelets

What is the difference between arteries and veins?

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

• Arteries carry oxygenated blood, while veins carry deoxygenated blood only.

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

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

What are the components of blood?

• Red blood cells, white blood cells, platelets, and plasma.

• Hemoglobin, myoglobin, and fibrinogen.

• Cholesterol, glucose, and triglycerides.

• Neurons, synapses, and neurotransmitters.

What is the function of platelets in the blood?

• To transport oxygen throughout the body.

• To form clots (i.e. scabs) when you have cuts and grazes.

• To fight infections and diseases.

• To regulate body temperature.

What is the function of plasma in the blood?

• To transport nutrients, hormones, and waste products.

• To produce red blood cells.

• To fight infections and diseases.

• To regulate body temperature.

Which chamber of the heart does blood returning from the body enter?

• Right atrium

• Left atrium

• Right ventricle

• Left ventricle