,BIOD 121 Module 5 Exam | Essentials in
Nutrition | Portage Learning | Q & A 2026
Edition
1. Which of the following best defines physical fitness?
A) The ability to lift heavy weights for a short period
B) The ability to perform moderate to vigorous activity without excess fatigue
C) The ability to run a marathon in under four hours
D) The ability to maintain a stable body weight over time
Correct Answer: The ability to perform moderate to vigorous activity without excess fatigue
Rationale: Physical fitness is defined as the capacity to carry out moderate to vigorous physical activities
without experiencing excessive fatigue. This definition encompasses cardiovascular endurance, muscular
strength, and overall stamina. The other options describe specific athletic achievements or weight
maintenance, not the broad concept of physical fitness.
2. What is the primary source of fuel for muscles during high-intensity, short-duration activities?
A) Fat
B) Protein
C) Carbohydrate
D) Alcohol
Correct Answer: Carbohydrate
Rationale: During high-intensity, short-duration activities, muscles primarily rely on carbohydrates
(glycogen) for quick energy production through anaerobic metabolism. Fat is the main fuel source for
low-intensity, long-duration activities. Protein is not a primary fuel source for exercise.
,3. As the level of physical fitness increases, the type of fuel used by the muscles changes. Improved
fitness translates into increased utilization of which fuel for muscle energy?
A) Carbohydrate
B) Protein
C) Fat
D) Alcohol
Correct Answer: Fat
Rationale: With improved fitness, the body becomes more efficient at utilizing fat for fuel during
exercise. This adaptation spares glycogen and allows for prolonged endurance. The question references
the module's key concept: "As the level of fitness increases... Improved translates into increased
utilization of fat for muscle fuel."
4. Regular physical activity provides all of the following benefits EXCEPT:
A) Improved immune function and blood glucose control
B) Increased risk of certain cancers
C) Lower blood pressure and weight loss/control
D) Reduced stress and improved sleep
Correct Answer: Increased risk of certain cancers
Rationale: Regular physical activity is associated with a reduced risk of certain cancers, not an increased
risk. Other benefits include improved cardiovascular function, reduced stress, lower blood pressure,
weight control, improved sleep, enhanced immune function, better blood glucose control, and a slowing
of the aging process.
5. According to the Healthy People program, which of the following is an objective related to physical
activity?
A) To increase the number of adults who consume 8 cups of water daily
B) To double the number of adults who engaged in at least 30 minutes of activity daily
C) To reduce the number of adults who participate in resistance training
, D) To increase the consumption of sports beverages
Correct Answer: To double the number of adults who engaged in at least 30 minutes of activity daily
Rationale: The Healthy People program includes objectives to promote physical activity, such as
doubling the number of adults who engage in at least 30 minutes of daily activity. This is part of a
broader national effort to improve public health through increased physical fitness.
6. What is the recommended starting duration for daily exercise when initiating a new routine?
A) 60 minutes
B) 45 minutes
C) 30 minutes
D) 15 minutes
Correct Answer: 30 minutes
Rationale: When initiating an exercise routine, it is recommended to start with 30 minutes daily, not 60
minutes. Beginning with a manageable duration helps prevent injury, reduce the risk of burnout, and
establish a sustainable habit that can be gradually increased over time.
7. Which of the following statements about heart rate is TRUE?
A) Heart rate is the number of breaths taken per minute
B) Heart rate is the number of beats of one's heart per minute
C) Heart rate is the maximum number of times the heart can beat in one minute
D) Heart rate is the number of calories burned per minute during exercise
Correct Answer: Heart rate is the number of beats of one's heart per minute
Rationale: Heart rate (HR) is defined as the number of times the heart beats per minute. It is a vital sign
used to assess cardiovascular function and exercise intensity. The maximum heart rate is calculated
differently, and heart rate is not a measure of respiratory rate or calorie expenditure.
Nutrition | Portage Learning | Q & A 2026
Edition
1. Which of the following best defines physical fitness?
A) The ability to lift heavy weights for a short period
B) The ability to perform moderate to vigorous activity without excess fatigue
C) The ability to run a marathon in under four hours
D) The ability to maintain a stable body weight over time
Correct Answer: The ability to perform moderate to vigorous activity without excess fatigue
Rationale: Physical fitness is defined as the capacity to carry out moderate to vigorous physical activities
without experiencing excessive fatigue. This definition encompasses cardiovascular endurance, muscular
strength, and overall stamina. The other options describe specific athletic achievements or weight
maintenance, not the broad concept of physical fitness.
2. What is the primary source of fuel for muscles during high-intensity, short-duration activities?
A) Fat
B) Protein
C) Carbohydrate
D) Alcohol
Correct Answer: Carbohydrate
Rationale: During high-intensity, short-duration activities, muscles primarily rely on carbohydrates
(glycogen) for quick energy production through anaerobic metabolism. Fat is the main fuel source for
low-intensity, long-duration activities. Protein is not a primary fuel source for exercise.
,3. As the level of physical fitness increases, the type of fuel used by the muscles changes. Improved
fitness translates into increased utilization of which fuel for muscle energy?
A) Carbohydrate
B) Protein
C) Fat
D) Alcohol
Correct Answer: Fat
Rationale: With improved fitness, the body becomes more efficient at utilizing fat for fuel during
exercise. This adaptation spares glycogen and allows for prolonged endurance. The question references
the module's key concept: "As the level of fitness increases... Improved translates into increased
utilization of fat for muscle fuel."
4. Regular physical activity provides all of the following benefits EXCEPT:
A) Improved immune function and blood glucose control
B) Increased risk of certain cancers
C) Lower blood pressure and weight loss/control
D) Reduced stress and improved sleep
Correct Answer: Increased risk of certain cancers
Rationale: Regular physical activity is associated with a reduced risk of certain cancers, not an increased
risk. Other benefits include improved cardiovascular function, reduced stress, lower blood pressure,
weight control, improved sleep, enhanced immune function, better blood glucose control, and a slowing
of the aging process.
5. According to the Healthy People program, which of the following is an objective related to physical
activity?
A) To increase the number of adults who consume 8 cups of water daily
B) To double the number of adults who engaged in at least 30 minutes of activity daily
C) To reduce the number of adults who participate in resistance training
, D) To increase the consumption of sports beverages
Correct Answer: To double the number of adults who engaged in at least 30 minutes of activity daily
Rationale: The Healthy People program includes objectives to promote physical activity, such as
doubling the number of adults who engage in at least 30 minutes of daily activity. This is part of a
broader national effort to improve public health through increased physical fitness.
6. What is the recommended starting duration for daily exercise when initiating a new routine?
A) 60 minutes
B) 45 minutes
C) 30 minutes
D) 15 minutes
Correct Answer: 30 minutes
Rationale: When initiating an exercise routine, it is recommended to start with 30 minutes daily, not 60
minutes. Beginning with a manageable duration helps prevent injury, reduce the risk of burnout, and
establish a sustainable habit that can be gradually increased over time.
7. Which of the following statements about heart rate is TRUE?
A) Heart rate is the number of breaths taken per minute
B) Heart rate is the number of beats of one's heart per minute
C) Heart rate is the maximum number of times the heart can beat in one minute
D) Heart rate is the number of calories burned per minute during exercise
Correct Answer: Heart rate is the number of beats of one's heart per minute
Rationale: Heart rate (HR) is defined as the number of times the heart beats per minute. It is a vital sign
used to assess cardiovascular function and exercise intensity. The maximum heart rate is calculated
differently, and heart rate is not a measure of respiratory rate or calorie expenditure.
