1. a by-product produced in the muscles during exercise muscle fibers.
2. veins in the body which have been stretched out of shape and do not move blood through the body effectively anymore varicose veins.
3. the way you hold your body muscle myofibrils.
4. the cells that make up a muscle range of motion.
5. how far in any direction a part of the body is able to move posture?
6. small sections in a muscle cell that move when a muscle is being used lactic acid.

1. lactic acid, 2. varicose veins or spider veins, 3. posture, 4. muscle fibers, 5. range of motion, 6. muscle myofibrils

Explanation:

1. usually happens during anaerobic metabolism reactions, there is sufficient O₂ to decompose the glucose and glycogen formed during exercise.

2. these veins are common in older women and usually are formed as a result of standing for too long. The semi-lunar valves weaken in the leg, and therefore blood does not get caught in those valves but escapes downwards and then collects resulting in those thick or swollen looking veins, or it is hereditary.

3. this is the manner in which you keep your body and its muscles in place or basically how one 'carries their body.'

4. the human skeletal muscle is made of these muscle fibres which add density and support to the bones along with the veins and nerves

5. this is the specified amount of movement a body is able to do, each individual has a different range of motion, the older one gets, the less of a range there is present.

6. is kind of a 'monomer' for muscles, it is the 'basic unit' and is rod shaped. Each rod has thick and thin filaments within them.

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