Resistance also influences <u>total</u> blood flow. Resistance is defined as the amount of <u>friction</u> the blood experiences as it travels through the blood vessels. Blood flow is always <u>opposed</u> by resistance. Friction is due to the contact between <u>blood</u> and the blood vessel wall. The term <u>peripheral resistance</u> is typically used when discussing the resistance of blood in the blood vessels (as opposed to the resistance of blood in the heart). Several factors affect this friction, including blood <u>viscocity</u> , blood vessel <u>length</u> , and the <u>size of the lumen </u>of blood vessels (as indicated by vessel radius).
Oxygen in the air can cause sliced fruit to brown, a process called enzymic browning (an oxidation reaction). Phenols and the enzyme phenolase are found in the cells of the apple, and when these are exposed to oxygen in the air, for example through slicing, the oxygen causes a reaction.
Answer:
1. the measure of the health and condition of the heart, lungs, muscles, and joints of an individual - Physical Fitness
2. the parts of the body that are related to the movement of blood - circulatory system
3. a plan in which a person chooses to exercise a certain number of times every week - regular exercise
4. the organs inside the body and how they function together- internal system
5. a type of physical conditioning that lengthens the muscles and improves the movement of the joints - flexibility
6- obstacles or difficulties that keep a person from accomplishing what he wants to, such as regular exercise - limiting factors