How does Chlorophyll obtain its energy? a. from CO₂ and water? b. absorbed from solar energy c. converted from chemical energy into ATP d. glucose broken down through a series of reactions

EXERCISE 1 BONE REMODELING Work in a small group or alone to complete this exercise. 1. Describe one hypothetical situation that illustrates the "use it" portion of the use it or lose it principle. Description of the situation/behavior: Explanation for why more bone is present under these circumstances: 2. Describe one hypothetical situation that illustrates the "lose it" portion of the use it or lose it principle. Description of the situation/behavior: Explanation for why less bone is present under these circumstances:

Move Making Connections, Student Laboratory Packet, page 5 A2. How Does Fatigue Affect Muscle Performance? A condition known as muscle fatigue occurs when certain waste products of muscle cell activity build up in the cells. Until these waste chemicals are removed, the fatigue will continue. Do the Following Activity Hold a spring-type clothespin between your thumb and index finger. Pinch the ends together completely (until the two ends touch) and release them. Do this as rapidly as possible for one minute. Record the number of times you could squeeze the clothespin in one minute: Try the activity again, doing it the same way and using the same two fingers as before. Record the number of times you could squeeze the clothespin the second time: Answer the Following Questions Some people are able to squeeze the clothespin more times in a minute than others. Suggest a possible explanation for this. Could you do as many in a minute the second time as you could do the first time? Provide a…

VISUAL SKILLS What will happen in a muscle cell thathas used up its supply of oxygen and ATP? (ReviewFigures 9.18 and 9.20.)