Explain Aerobic Energy System - Correct Answers - The main body system that produces energy for

Unit 5, Aerobic Fitness and Training SFBFC with Complete Solutions Explain Aerobic Energy System - Correct Answers - The main body system that produces energy for activity lasting more than 3 to 4 minutes

• Improves the bodies ability to take in, transport, and use oxygen.
• Improves the body composition (reduces body fat), blood lipid profiles, and reduces the risk of

developing heart disease.Two types of Body Adaptations (Changes) - Correct Answers - Immediate

• Long-term

Explain Immediate Adaptations - Correct Answers - Changes which occur over the course of a couple of weeks when beginning a cardiovascular training program

• Primary Short-term Changes - Correct Answers - Decrease in heart rate at rest or when exercising is

the most noticeable change that can be detected by the individual.

• Increase in blood flow
• Heart becomes stronger and develops a more forceful contraction, allowing more blood to be

pumped.Genetic Influence on Training - Correct Answers - Some individuals may see more dramatic

improvements than others due to:

• Cardiopulmonary system that is better adapted to deliver large amounts of oxygen to the muscle.
• High percentage of Type I muscle fibers that effectively use the oxygen that is delivered to them.

Type I muscle fibers are those that are able to contract repeatedly with low force for long periods of time without fatigue. 1 / 2

Long-Term Physiological Changes - Correct Answers Changes which occur after more than 16 weeks of training.

• Increased number of red blood cells
• Increased plasma volume of the blood
• Increased arterial-venous oxygen difference
• Increased capillary density and an increase number of mitochondria in the muscle cells
• Increased mitochondrial density in muscle cells
• Decreased in resting heart rate
• Weight Loss

Red Blood Cells - Correct Answers - Most of the oxygen carried through the blood is bound to Hemoglobin which is a protein found in red blood cells.

• Aerobic Training = More red blood cells = increased hemoglobin concentration = more oxygen to

the working cells in the body.Plasma Volume - Correct Answers - The liquid part of the blood, the greater the volume the thinner the blood becomes. Making it faster for oxygen to be delivered to the working cells.Arterial-Venous Oxygen Difference - Correct Answers - The measurement of how much oxygen a tissue (muscle) is able to remove from the blood.

• The improved ability to extract oxygen from the blood occurs primarily because of an increase in

the number of capillaries that supply the muscle and more mitochondria in the muscle cells.

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