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.
Transport proteins help move other molecules around your body. Hemoglobin is a protein found in your red blood cells that carries oxygen from your lungs to every cell in your body. Thatâs like the post office being able to bring new packages to ten trillion houses every second of every day all year long.