Test: Blood - Year 11 MCQ

Red blood cells are primarily responsible for transporting oxygen from the lungs to the tissues throughout the body. This is achieved through the protein hemoglobin, which binds oxygen.

White blood cells, particularly lymphocytes, produce antibodies that specifically target and neutralize pathogens, playing a crucial role in the immune response.

Red blood cells are characterized by their concave disc shape and lack of a nucleus, which helps increase their surface area for oxygen transport.

Platelets release chemicals that activate the clotting cascade, leading to the conversion of soluble fibrinogen into insoluble fibrin, which forms a clot.

Platelets are essential for blood clotting as they form a temporary plug at the site of injury and release chemicals that initiate the clotting process.

Fibrin forms a mesh that traps red blood cells and platelets, creating a stable blood clot that prevents further bleeding.

Neutrophils are a type of white blood cell that perform phagocytosis, engulfing and digesting pathogens to protect the body from infections.

Plasma is primarily composed of water, which serves as the medium for transporting nutrients, hormones, and waste products throughout the body.

Lymphocytes, particularly B cells, produce antibodies that specifically target and neutralize pathogens, which is a crucial aspect of the adaptive immune response.

Once the underlying tissues are sufficiently healed, the scab naturally falls off, leaving behind new, healed skin.