Which protective membranes cover and protect the brain and spinal cord?

Which membrane surrounds the heart and protects it within the chest cavity?

Which fluid cushions and protects the brain and spinal cord from mechanical shock?

Which membrane surrounds the lungs and reduces friction during breathing movements?

Which fluid lubricates joints and reduces friction between bones during movement?

Which gas exchange membrane structure in the lungs maximizes surface area for efficient breathing?

Which fluid in the lymphatic system helps transport white blood cells and remove waste from tissues?

Which soft tissue found inside bones is responsible for producing new blood cells?

Which white blood cell type is primarily responsible for producing antibodies against pathogens?

Which flexible connective tissue cushions joints and is found in structures like the ear and nose?

Which white blood cell type is the most abundant and primarily fights bacterial infections?