CB8 Edexcel biology

Which 2 options increase the rate of diffusion?

• When surfaces are thin

• A large surface area

• A small surface area

• When substances have a long distance to travel

What structure increases the surface area of the lungs?

• Capillaries

• Alveoli

• Lymphocytes

• Ventricles

If a structure has a larger surface area to volume ratio what will happen to the rate of diffusion?

• The rate will increase

• The rate will decrease

• There will be no change

Why do veins contain valves?

• To stop blood from flowing in the wrong direction

• To help the flow of blood

• To make sure enough blood is circulating the body

• To stop blood flow in case you cut yourself

What is the role of phagocytes

• They release antibodies

• They carry oxygen in the blood

• They transport dissolved substances in the blood

• They engulf and digest pathogens

What is the role of lymphocytes

• They release antibodies

• They carry oxygen in the blood

• They transport dissolved substances in the blood

• They engulf and digest pathogens

What is the role of red blood cells

• They release antibodies

• They carry oxygen in the blood

• They transport dissolved substances in the blood

• They engulf and digest pathogens

What is the role of plasma

• They release antibodies

• They carry oxygen in the blood

• They transport dissolved substances in the blood

• They engulf and digest pathogens

Which option is NOT a way red blood cells are adapted to carry oxygen?

• They contain haemaglobin

• They have a biconcave shape

• They do not contain a nucleus

• They have a small surface area to volume ratio

How does blood travel through the left side of the heart?

• Aorta - atrium - ventricle - aorta

• Ventricle - atrium - pulmonary vein - aorta

• pulmonary vein - aorta - ventricle - atrium

• Pulmonary vein - atrium - ventricle - aorta