Use words to express. any number that begins a sentence, title, or text heading. Whenever possible, reword the sentence to avoid beginning with a number. Examples: 1  Ten participants answered the questionnaire.  Forty-eight percent of the sample showed an increase; 2% showed no change.
Transport of oxygen in the blood Blood Blood is an 'aqueous body fluid'. In other words it is water containing a whole range of substances. It is contained in a complex network called the vascular system and is pumped around the body by the heart.
The cellular portion of blood contains red blood cells (RBCs), white blood cells (WBCs) and platelets. The RBCs carry oxygen from the lungs. The WBCs help to fight infection, and platelets are parts of cells that the body uses for clotting. All blood cells are produced in the bone marrow.