Answer:
Step-by-step explanation:
When she is running, Paula's muscle activity increases. To do this, her muscle cells respire at a faster rate to give her more energy. Her muscles need to be supplied with glucose and oxygen more quickly. Her heart beats faster to increase the flow of blood which carries the products carbon dioxide and heat away from her muscles.
Note: The words used in the sentences are as follows:
respire - to breathe, to undergo the process of respiration to release energy from glucose
glucose - a sugar that is an important source of energy for the body
oxygen - a gas that is essential for respiration and is needed for the body to produce energy
blood - the fluid that circulates through the heart, arteries, capillaries, and veins and carries oxygen and nutrients to the body's tissues and removes carbon dioxide and metabolic waste products
carbon dioxide - a waste product of respiration that is removed from the body through breathing
heat - a by-product of metabolic reactions in the body
breathe - to inhale and exhale air
nitrogen - a gas that makes up a large part of the air we breathe but is not directly involved in respiration.