Transport systems in animals

What happens to red blood cells as they pass through the capillaries in the lungs?

• Carbon dioxide diffuses from the air in the alveoli into the red blood cells and attaches to their haemoglobin

• Oxygen diffuses from the air in the alveoli into the red blood cells and attaches to their haemoglobin

• Oxygen is released from the haemoglobin in the red blood cells and diffuses into the air in the alveoli

Which of the following products of digestion are transported in the blood capillaries of the villi?

• Amino acids and glucose

• Glucose and fatty acids

• Fatty acids and glycerol

Which structure in the villi is responsible for absorption for fatty acids and glycerol?

• Lacteal

• Blood capillary

• Cell membrane

• Small instestine

In mammals, why must oxygen and nutrients from food be absorbed into the bloodstream for delivery to cells?

• For respiration

• For photosynthesis

• To live

• For Transpiration

Which of the following blood vessels allow the exchange of materials at cellular level?

• Arteries

• Veins

• Capillaries

Which of the following blood vessels contains valves?

• Arteries

• Veins

• Capillaries

Which of the following blood vessels has thick muscular walls?

• Arteries

• Veins

• Capillaries

What is the function of valves?

• They prevent the backflow of blood

• The prevent deoxygenated and oxygenated blood form mixing

• The prevent blood going the wrong way

• The ensure blood travels in the right direction

Into which chamber of the heart does blood flow from the pulmonary vein?

• Left atrium

• Left ventricle

• Right atrium

• Right ventricle

Which vessel carries blood from the heart to the lungs?

• Aorta

• Pulmonary artery

• Pulmonary vein

• Vena cava