Final Exam review pt 1

What percentage of VO2 max is considered low intensity during exercise?

• 25-30%

• 40-50%

• 60-75%

• 80-90%

Answer explanation

Low intensity exercise is typically defined as 25-30% of VO2 max. This range allows for light activity, making it suitable for warm-ups or recovery sessions.

During moderate intensity exercise, what is the approximate energy source distribution?

• 1/2 from muscle glycogen, 1/2 from fat

• 1/3 from muscle glycogen, 2/3 from fat

• 3/4 from muscle glycogen, 1/4 from fat

• All from muscle glycogen

Answer explanation

During moderate intensity exercise, energy is derived equally from muscle glycogen and fat, making the correct choice 1/2 from muscle glycogen, 1/2 from fat. This balance supports sustained performance.

What limits the use of fat at higher intensities during exercise?

• Excessive blood flow

• Insufficient oxygen and slow transfer of fatty acids into mitochondria

• High levels of glucose

• Rapid transfer of fatty acids into mitochondria

Answer explanation

At higher exercise intensities, the body requires more oxygen, which limits the ability to oxidize fat. Additionally, the slow transfer of fatty acids into mitochondria further restricts fat utilization, making glucose a more accessible energy source.

What is the primary fuel source during high-intensity exercise at 85% VO2 max?

• Fats

• Proteins

• Carbohydrates

• Vitamins

Answer explanation

During high-intensity exercise at 85% VO2 max, the body primarily relies on carbohydrates for energy. This is because carbohydrates can be rapidly metabolized to meet the high energy demands of such intense activity.

What happens to blood glucose levels during prolonged high-intensity exercise?

• They increase significantly

• They remain constant

• They drop

• They double

Answer explanation

During prolonged high-intensity exercise, the body utilizes glucose for energy, leading to a decrease in blood glucose levels. Therefore, the correct answer is that they drop.

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-3

What is a consequence of lactate buildup in the blood during high-intensity exercise?

• Increased energy

• Fatigue

• Improved endurance

• Enhanced strength

Answer explanation

Lactate buildup during high-intensity exercise leads to fatigue as it causes muscle acidosis, impairing performance and reducing the ability to sustain effort.

How is hypoglycemia delayed during prolonged exercise?

• By increased fat intake

• By gluconeogenesis in the liver

• By protein supplements

• By increased carbohydrate intake

Answer explanation

During prolonged exercise, hypoglycemia is delayed primarily by gluconeogenesis in the liver, which produces glucose from non-carbohydrate sources, helping to maintain blood sugar levels.

What happens when energy intake is greater than energy output?

• Weight Loss

• Weight Gain

• Weight Maintenance

• No Change

Answer explanation

When energy intake exceeds energy output, the body stores the excess energy as fat, leading to weight gain. This is because the surplus energy is not used for immediate needs and accumulates over time.

Which of the following describes a neutral energy balance?

• Energy Intake > Energy Output

• Energy Intake < Energy Output

• Energy Intake ~ Energy Output

• Energy Output = 0

Answer explanation

A neutral energy balance occurs when energy intake is approximately equal to energy output, meaning the body maintains its weight. Therefore, the correct choice is 'Energy Intake ~ Energy Output'.

What is a potential consequence of a negative energy balance?

• Weight Gain

• Weight Maintenance

• Weight Loss

• Increased Muscle Mass

Answer explanation

A negative energy balance occurs when energy expenditure exceeds energy intake, leading to weight loss as the body utilizes stored fat for energy.