Background: In exercises such as weight lifting, skeletal muscle contracts against a resisting force (see Figure below ). Using skeletal muscle in this way increases its size and strength. In exercises such as running, the cardiac muscle contracts faster and the heart pumps more blood. Using cardiac muscle in this way increases its strength and efficiency. Continued exercise is necessary to maintain bigger, stronger muscles. If you don’t use a muscle, it will get smaller and weaker—so use it or lose it.

Situation: Two groups of soldiers started different training programs. Blue group did weight training for 3 months, while Brown group ran 3 miles a day for three months. The Captain observed different results on each group.

Question: Which group didn't increase the size of their muscles?
Answer: Brown

Situation: Two groups of soldiers started different training programs. Blue group did weight training for 3 months, while Brown group ran 3 miles a day for three months. The Captain observed different results on each group.

Question: Which group increased the strength of their muscles?
Answer: Blue

Situation: Two groups of soldiers started different training programs. Blue group did weight training for 3 months, while Brown group ran 3 miles a day for three months. The Captain observed different results on each group.

Question: Which group had their cardiac muscles contract faster while training?
Answer: Brown

Situation: Two groups of soldiers started different training programs. Blue group did weight training for 3 months, while Brown group ran 3 miles a day for three months. The Captain observed different results on each group.

Question: Which group didn't have their cardiac muscles contract as fast while training?
Answer: Blue

Situation: Two groups of soldiers started different training programs. Blue group did weight training for 3 months, while Brown group ran 3 miles a day for three months. The Captain observed different results on each group.

Question: Which group didn't have their hearts pumping more blood while training?
Answer: Blue

Situation: Two groups of soldiers started different training programs. Blue group did weight training for 3 months, while Brown group ran 3 miles a day for three months. The Captain observed different results on each group.

Question: Which group had their hearts pumping more blood while training?
Answer: Brown

Situation: Two groups of soldiers started different training programs. Blue group did weight training for 3 months, while Brown group ran 3 miles a day for three months. The Captain observed different results on each group.

Question: Which group increased the strength of their cardiac muscle?
Answer: Brown

Situation: Two groups of soldiers started different training programs. Blue group did weight training for 3 months, while Brown group ran 3 miles a day for three months. The Captain observed different results on each group.

Question: Which group didn't increase the strength of their cardiac muscle as much as the other group?
Answer: Blue

Situation: Two groups of soldiers started different training programs. Blue group did weight training for 3 months, while Brown group ran 3 miles a day for three months. The Captain observed different results on each group.

Question: Which group didn't increase the efficiency of their cardiac muscle as much as the other group?
Answer: Blue

Situation: Two groups of soldiers started different training programs. Blue group did weight training for 3 months, while Brown group ran 3 miles a day for three months. The Captain observed different results on each group.

Question: Which group increased the efficiency of their cardiac muscle?
Answer: Brown

Situation: Danny started weight lifting two years ago, he wanted to be bigger. His brother Arnie preferred athletic competitions such as running, so he became a runner.

Question: Which brother had more skeletal muscles contract against a resisting force?
Answer: Danny

Situation: Danny started weight lifting two years ago, he wanted to be bigger. His brother Arnie preferred athletic competitions such as running, so he became a runner.

Question: Which brother had fewer skeletal muscles contract against a resisting force?
Answer: Arnie

Situation: Danny started weight lifting two years ago, he wanted to be bigger. His brother Arnie preferred athletic competitions such as running, so he became a runner.

Question: Which brother gradually increased the size of his muscles?
Answer: Danny

Situation: Danny started weight lifting two years ago, he wanted to be bigger. His brother Arnie preferred athletic competitions such as running, so he became a runner.

Question: Which brother gradually increased the strength of his muscles?
Answer: Danny

Situation: Danny started weight lifting two years ago, he wanted to be bigger. His brother Arnie preferred athletic competitions such as running, so he became a runner.

Question: Which brother increased the strength of his muscles less?
Answer: Arnie

Situation: Danny started weight lifting two years ago, he wanted to be bigger. His brother Arnie preferred athletic competitions such as running, so he became a runner.

Question: Which brother didn't increase the size of his muscles?
Answer: Arnie

Situation: Danny started weight lifting two years ago, he wanted to be bigger. His brother Arnie preferred athletic competitions such as running, so he became a runner.

Question: Which brother increased the strength of his cardiac muscle?
Answer: Arnie

Situation: Danny started weight lifting two years ago, he wanted to be bigger. His brother Arnie preferred athletic competitions such as running, so he became a runner.

Question: Which brother didn't increase the strength of his cardiac muscle?
Answer: Danny

Situation: Danny started weight lifting two years ago, he wanted to be bigger. His brother Arnie preferred athletic competitions such as running, so he became a runner.

Question: Which brother didn't increase the efficiency of his cardiac muscle?
Answer: Danny

Situation: Danny started weight lifting two years ago, he wanted to be bigger. His brother Arnie preferred athletic competitions such as running, so he became a runner.

Question: Which brother increased the efficiency of his cardiac muscle?
Answer: Arnie

Situation: Bill and Bob were two brothers. they were both into physical exercise, but Bill chose weight lifting, and Bob running.

Question: Which brother had more muscles contract against a resisting force?
Answer: Bill

Situation: Bill and Bob were two brothers. they were both into physical exercise, but Bill chose weight lifting, and Bob running.

Question: Which brother had fewer muscles contract against a resisting force?
Answer: Bob

Situation: Bill and Bob were two brothers. they were both into physical exercise, but Bill chose weight lifting, and Bob running.

Question: Which brother had to do continuous exercise to maintain form?
Answer: Bill

Situation: Bill and Bob were two brothers. they were both into physical exercise, but Bill chose weight lifting, and Bob running.

Question: Which brother didn't have to do continuous exercise to maintain form?
Answer: Bob

Situation: Bill and Bob were two brothers. they were both into physical exercise, but Bill chose weight lifting, and Bob running.

Question: Which brother had bigger muscles?
Answer: Bill

Situation: Bill and Bob were two brothers. they were both into physical exercise, but Bill chose weight lifting, and Bob running.

Question: Which brother had smaller muscles?
Answer: Bob

Situation: Bill and Bob were two brothers. they were both into physical exercise, but Bill chose weight lifting, and Bob running.

Question: Which brother had stronger muscles?
Answer: Bill

Situation: Bill and Bob were two brothers. they were both into physical exercise, but Bill chose weight lifting, and Bob running.

Question: Which brother had more enduring muscles?
Answer: Bob

Situation: Bill and Bob were two brothers. they were both into physical exercise, but Bill chose weight lifting, and Bob running.

Question: Which brother used his cardiac muscle in a more efficient way?
Answer: Bob

Situation: Bill and Bob were two brothers. they were both into physical exercise, but Bill chose weight lifting, and Bob running.

Question: Which brother used his cardiac muscle in a less efficient way?
Answer: Bill

Situation: Two groups of athletes started new training routines this year.  Group A started weight lifting for three months, while Group B, did running exercises.

Question: Which group's skeletal muscles contract against a resisting force?
Answer: Group A

Situation: Two groups of athletes started new training routines this year.  Group A started weight lifting for three months, while Group B, did running exercises.

Question: Which group's cardiac muscle contracts faster?
Answer: Group B

Situation: Two groups of athletes started new training routines this year.  Group A started weight lifting for three months, while Group B, did running exercises.

Question: Which group will get increased muscle size and strength?
Answer: Group A

Situation: Two groups of athletes started new training routines this year.  Group A started weight lifting for three months, while Group B, did running exercises.

Question: Which group will not get increased muscle size?
Answer: Group B

Situation: Two groups of athletes started new training routines this year.  Group A started weight lifting for three months, while Group B, did running exercises.

Question: Which group's skeletal muscles do not contract against a resisting force?
Answer: Group B

Situation: Two groups of athletes started new training routines this year.  Group A started weight lifting for three months, while Group B, did running exercises.

Question: Which group's cardiac muscle contracts slower?
Answer: Group B

Situation: Two groups of athletes started new training routines this year.  Group A started weight lifting for three months, while Group B, did running exercises.

Question: Which group's hearts will pump more blood?
Answer: Group B

Situation: Two groups of athletes started new training routines this year.  Group A started weight lifting for three months, while Group B, did running exercises.

Question: Which group's hearts will pump less blood?
Answer: Group A

Situation: Two groups of athletes started new training routines this year.  Group A started weight lifting for three months, while Group B, did running exercises.

Question: Which group's method of exercise contributed to increased strength and efficiency?
Answer: Group B

Situation: Two groups of athletes started new training routines this year.  Group A started weight lifting for three months, while Group B, did running exercises.

Question: Which group's method of exercise did not contribue to increased efficiency?
Answer: Group A