Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

3. Energy & Cell Processes

Introduction to Metabolism

Anatomy & Physiology

3. Energy & Cell Processes

Introduction to Metabolism

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1:44 minutes

Problem 12

Textbook Question

An average adult human requires 2,200 kcal of energy per day. Suppose your diet provides an average of 2,300 kcal per day. How many hours per week would you have to walk to burn off the extra calories? Swim? Run? (See Figure 6.4.)

Verified step by step guidance

Step 1: Calculate the extra calories consumed per day by subtracting the required calories from the provided calories: 2,300 kcal - 2,200 kcal.

Step 2: Multiply the extra calories per day by 7 to find the total extra calories consumed per week.

Step 3: Refer to Figure 6.4 to find the number of calories burned per hour for walking, swimming, and running.

Step 4: Divide the total extra calories per week by the number of calories burned per hour for each activity to find the hours needed per week for walking, swimming, and running.

Step 5: Summarize the hours per week required for each activity to burn off the extra calories.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Caloric Balance

Caloric balance refers to the relationship between calories consumed through diet and calories expended through physical activity and metabolism. To maintain weight, the number of calories consumed should equal the number of calories burned. In this scenario, the individual consumes 2,300 kcal daily, which exceeds the average requirement of 2,200 kcal, creating a surplus that needs to be addressed through physical activity.

Metabolic Equivalent of Task (MET)

MET is a unit that estimates the amount of energy expended during physical activities compared to resting. One MET is defined as the energy cost of sitting quietly, approximately 1 kcal/kg/hour. Activities like walking, swimming, and running have different MET values, which help determine how many calories are burned per hour based on the intensity of the activity and the individual's weight.

Energy Expenditure from Exercise

Energy expenditure from exercise quantifies the calories burned during physical activities. The figure provided illustrates the kcal burned per hour for various activities performed by a 67.5-kg person. By knowing the kcal burned for activities like walking, swimming, and running, one can calculate how many hours of each activity are needed to burn off the excess calories consumed, thus achieving a caloric deficit.