A glucose molecule is absorbed from the small intestine into the bloodstream. The passage below describes its journey to a leg muscle.
Complete the sentences in the passage by writing a suitable word or words on each dotted line.
The glucose is absorbed into the blood through the walls of the smallest blood vessels, called .................................................... , in the villi of the small intestine. It is transported to the liver in the hepatic portal vein. It then leaves the liver and travels to the heart in the largest vein in the body, called the .................................................... .
It enters a chamber of the heart called the right atrium, and then passes into the right .................................................... . From here, it is pumped to the lungs via the .................................................... artery.
The glucose returns to the left atrium of the heart via the pulmonary .................................................... . It is then pumped into the left ventricle and leaves the heart through the .................................................... , which is the largest artery in the body.
When it reaches the leg muscle tissue, the glucose leaves the blood to enter the muscle cells, where it is used in a metabolic process called .................................................... to release energy.
