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Questions and Answers
Why does muscle activity slow down and fatigue set in?
Why does muscle activity slow down and fatigue set in?
Which of the following is NOT a form of carbohydrate?
Which of the following is NOT a form of carbohydrate?
Which of the following is the storage form of glucose in mammals?
Which of the following is the storage form of glucose in mammals?
Which of the following is a monosaccharide?
Which of the following is a monosaccharide?
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What is the primary fuel for energy in the brain?
What is the primary fuel for energy in the brain?
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What is the role of ATP in muscle contraction?
What is the role of ATP in muscle contraction?
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How are disaccharides formed?
How are disaccharides formed?
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What is the role of metabolism in muscle contraction?
What is the role of metabolism in muscle contraction?
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What is the primary function of catabolism?
What is the primary function of catabolism?
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Which of the following is NOT a byproduct of metabolism?
Which of the following is NOT a byproduct of metabolism?
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Which energy system is primarily responsible for providing energy for high-intensity efforts lasting 10 seconds or less?
Which energy system is primarily responsible for providing energy for high-intensity efforts lasting 10 seconds or less?
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What is the main difference between anaerobic glycolysis and aerobic metabolism in terms of their ATP production capacity?
What is the main difference between anaerobic glycolysis and aerobic metabolism in terms of their ATP production capacity?
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Which of the following statements accurately describes the relationship between the speed of ATP production and the capacity for ATP production?
Which of the following statements accurately describes the relationship between the speed of ATP production and the capacity for ATP production?
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Why is the ATP-PC system considered a short-term energy system?
Why is the ATP-PC system considered a short-term energy system?
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What impact does the location of PC within the muscle have on the rate of ATP formation?
What impact does the location of PC within the muscle have on the rate of ATP formation?
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During short-term, high-intensity exercise, which of the following is NOT a benefit of elevated intramuscular ATP and PC levels?
During short-term, high-intensity exercise, which of the following is NOT a benefit of elevated intramuscular ATP and PC levels?
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What is the primary product of glycolysis in the absence of oxygen?
What is the primary product of glycolysis in the absence of oxygen?
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Where does glycolysis take place within the muscle cell?
Where does glycolysis take place within the muscle cell?
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Which of the following is NOT a benefit of chronic creatine supplementation in athletes?
Which of the following is NOT a benefit of chronic creatine supplementation in athletes?
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What is the primary function of creatine kinase in muscle cells?
What is the primary function of creatine kinase in muscle cells?
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Which of the following is NOT a major metabolic substrate used by the body to produce energy?
Which of the following is NOT a major metabolic substrate used by the body to produce energy?
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When the body breaks down carbohydrates for energy, what is the primary simple sugar that is produced?
When the body breaks down carbohydrates for energy, what is the primary simple sugar that is produced?
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Which of the following energy systems is primarily used for short, high-intensity activities like sprinting?
Which of the following energy systems is primarily used for short, high-intensity activities like sprinting?
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Which of the following is a positive feature of the glycolytic pathway?
Which of the following is a positive feature of the glycolytic pathway?
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What is the primary function of the electron transport chain in relation to energy production?
What is the primary function of the electron transport chain in relation to energy production?
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During periods of rest, which of the following energy substrates is primarily used by the body?
During periods of rest, which of the following energy substrates is primarily used by the body?
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How does the body obtain energy from the food we eat?
How does the body obtain energy from the food we eat?
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Which enzyme is considered a rate limiter in glycolysis?
Which enzyme is considered a rate limiter in glycolysis?
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What is the primary energy source for a 3-second sprint?
What is the primary energy source for a 3-second sprint?
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How does improved buffering capacity impact athletic performance during high-intensity exercise?
How does improved buffering capacity impact athletic performance during high-intensity exercise?
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Which type of training tends to result in a longer duration of ATP-PC system utilization during exercise?
Which type of training tends to result in a longer duration of ATP-PC system utilization during exercise?
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What is the primary reason why endurance training can increase the time it takes to exhaust the ATP-PC system?
What is the primary reason why endurance training can increase the time it takes to exhaust the ATP-PC system?
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Which of the following is a product of glycogenolysis?
Which of the following is a product of glycogenolysis?
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What is the main energy source for the brain?
What is the main energy source for the brain?
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What is the main function of lipolysis?
What is the main function of lipolysis?
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Which of the following is NOT a consequence of prolonged exercise?
Which of the following is NOT a consequence of prolonged exercise?
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What is the main advantage of using fat as an energy source during exercise?
What is the main advantage of using fat as an energy source during exercise?
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What is the role of enzymes in biological processes?
What is the role of enzymes in biological processes?
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What is the difference between essential and nonessential amino acids?
What is the difference between essential and nonessential amino acids?
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Which of the following is a characteristic of an enzyme?
Which of the following is a characteristic of an enzyme?
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Flashcards
Metabolites
Metabolites
Three major substrates: carbs, fats, proteins converted to energy.
ATP-PC System
ATP-PC System
Energy production pathway using adenosine triphosphate and phosphocreatine.
Glycogenesis
Glycogenesis
The formation of glycogen from glucose.
Glycolysis
Glycolysis
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Phosphagen Pathway
Phosphagen Pathway
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Glycogenolysis
Glycogenolysis
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Carbohydrates for energy
Carbohydrates for energy
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Glycolytic Pathway
Glycolytic Pathway
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Lipolysis
Lipolysis
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Energy from Food
Energy from Food
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Triglycerides
Triglycerides
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Macronutrients
Macronutrients
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Energy systems
Energy systems
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Energy Sources in Exercise
Energy Sources in Exercise
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Essential amino acids
Essential amino acids
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Enzymes
Enzymes
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ATP
ATP
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Energy Release
Energy Release
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Muscle Contraction Needs
Muscle Contraction Needs
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Nutrient Breakdown
Nutrient Breakdown
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Carbohydrates
Carbohydrates
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Monosaccharides
Monosaccharides
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Polysaccharides
Polysaccharides
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Glycogen
Glycogen
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Creatine Loading
Creatine Loading
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Intramuscular ATP & PC
Intramuscular ATP & PC
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Creatine Kinase
Creatine Kinase
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Glycolysis Process
Glycolysis Process
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Lactate Formation
Lactate Formation
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Anabolism
Anabolism
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Catabolism
Catabolism
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Anaerobic metabolism
Anaerobic metabolism
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Aerobic metabolism
Aerobic metabolism
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Phosphocreatine (PCr) system
Phosphocreatine (PCr) system
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Metabolism byproducts
Metabolism byproducts
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Improved enzyme function
Improved enzyme function
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Glycogen phosphorylase
Glycogen phosphorylase
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Phosphofructokinase (PFK)
Phosphofructokinase (PFK)
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Buffering capabilities
Buffering capabilities
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ATP-PC vs. Glycolysis
ATP-PC vs. Glycolysis
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Study Notes
Essentials of Bioenergetics and Anaerobic Metabolic Pathways
- This chapter focuses on bioenergetics and anaerobic metabolic pathways.
- Students should be able to define major metabolic substrates and how they produce energy.
- Students will determine which metabolic substrates dominate during rest and various exercise types.
- They will also describe the production of energy from the adenosine triphosphate-phosphocreatine system and glycolysis.
- The positive and negative features of the energy pathways will be described. Students will explicate the adaptations of these systems with training.
Metabolism Applications
- Sprinters can only sprint all out for a brief period due to limitations in energy production.
- Marathoners can sustain a race pace for extended periods due to other energy production methods.
- Energy comes from chemical processes utilizing nutrients.
- Performance is limited by factors that can be overcome through methods like training.
Energy Needs
- Energy is required for muscle contraction, digestion, and reproduction.
What is Energy?
- Energy is the ability to do work.
- It is a capacity to do work and related to examples like a windmill.
- To make energy, food is converted in energy.
How do we get Energy?
- We get energy from food.
- Food is broken down to create energy.
Through Metabolism
- Metabolism is a series of chemical reactions in the cells.
- Bioenergetics is the process of converting food to usable energy.
- The reactions in the cell can use nutrients and stored energy.
Where does Energy Come From?
- The sun is the primary source of energy.
- Plants convert sunlight into carbohydrates.
- Animals consume plants and animals, breaking down carbohydrates, proteins, and fats to produce energy.
Energy Sources
- Chemical energy in food gets transformed into mechanical energy, leading to muscular contraction and movement.
- Macronutrients in food include carbohydrates, fats, and proteins
- Carbohydrates: Broken down into simple sugars (glucose, fructose, and galactose).
- Fats: Broken down into triglycerides and fatty acids.
- Proteins: Broken down to amino acids.
Adenosine Triphosphate (ATP)
- ATP is the energy currency in living beings.
- Breaking down phosphate bonds in ATP releases energy for biological work.
- It is the main energy carrier in the cell.
- Cells need a continuous supply of ATP to maintain function.
What does a Muscle Need?
- Muscle contraction requires a continuous supply of ATP.
- ATP production must match ATP demand to sustain the contraction process.
- Lacking ATP production can cause less intensity and fatigue and limit performance.
How is ATP Replaced?
- ATP is replaced through the breakdown of nutrients, using chemical reactions in the body.
ATP Supply
- Muscles store ATP in limited amounts, sufficient for 1-2 seconds of strenuous activity.
- The ATP-PC system is called the immediate system.
- This is the first system to be involved in ATP production when muscles need energy.
ATP-PC System
- The ATP-PC system is the immediate system of energy utilized.
- Phosphocreatine (PCr) is used to generate ATP.
- PCr is a high-energy compound stored in muscle cells.
- It provides a rapid burst of energy.
Comparing Energy Systems
- Different energy systems provide ATP at varying rates and capacities, suitable for different activities.
- The ATP-PC system provides energy most rapidly.
- Glycolysis provides energy less rapidly than the ATP-PC system.
- Aerobic metabolism (Cellular Respiration) is slowest and its contribution increases with longer activities.
Glycolysis
- Glycolysis is the breakdown of carbohydrates.
- Glycolysis occurs in the sarcoplasm of the muscle cells.
- It's an anaerobic process.
- Glycolysis does not need oxygen to breakdown carbohydrates.
- Glycolysis has 10-11 steps in the process
- During exercises, glycolysis produces high amounts of ATP quickly.
- Glycolysis produces only 2 ATPs and is limited by the accumulation of hydrogen ions, leading to a build-up of lactic acid and fatigue.
Glycolysis in the Absence of Oxygen
- In the absence of oxygen, pyruvate is converted to lactate.
- This conversion regenerates NAD+ so glycolysis can continue.
- Lactate can become beneficial to exercises because it leads to the continuation of glycolysis.
Glycolysis when Oxygen is Available
- In the presence of oxygen, pyruvate is further utilized for aerobic metabolism, producing more ATP.
- Pyruvate is converted to acetyl CoA.
Glycolysis Overview
- Anaerobic glycolysis is faster than aerobic glycolysis.
- Anaerobic glycolysis produces a lower concentration of ATP than aerobic glycolysis.
- Anaerobic glycolysis uses glucose or glycogen as a fuel.
- Aerobic glycolysis uses glucose or glycogen as a fuel to produce ATP in the presence of oxygen.
- In aerobic glycolysis, 2x Pyruvate becomes 2x Acetyl-CoA and produces H+ needed for ATP production in the mitochondria.
Glucose as a Substrate
- Glucose is a primary substrate for glycolysis that comes from blood and glycogen stores.
- It is catalyzed by hexokinase.
- Glycogen provides the glucose for glycolysis without using ATP.
Glycolysis: Key Points
- Glycolysis produces ATP quickly.
- Glycolysis has limited capacity due to acid accumulation.
- Glycolysis is the primary energy system during intense exercise lasting ~2-3 mins.
Common Adaptations
- Adaptations to exercise include improved enzyme function and substrate availability, to increase ATP production.
Glycolysis: Enzyme Adaptations
- Adaptations to exercise include changes in many glycolytic enzymes.
- The result of these changes is a higher availability of ATP from glycolysis.
- Key enzymes are glycogen phosphorylase, phosphofructokinase, and lactate dehydrogenase.
Glycolysis: Intramuscular
Adaptations
- Endurance training increases muscle glycogen stores.
- Weight and sprint training show mixed results regarding intramuscular glycogen adaptations.
Glycolysis: Buffering Adaptations
- Endurance and sprint training can increase cellular buffering capacities to reduce muscle acidity.
Interactions of Aerobic and Anaerobic Metabolism
- Anaerobic glycolysis is most significant for short, high-intensity exercises.
- Aerobic metabolism is most active during long-duration, low-intensity exercise.
3-Second Sprint
- A combination of metabolic pathways is involved
- The ATP-PC system is the predominant source of ATP.
- The percent of contribution from glycolysis and aerobic sources is low.
Other Important Points
- Various activities have different energy contributions
- The amount of contribution from one system depends on the activity.
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Description
Test your knowledge on muscle activity, carbohydrate forms, and energy metabolism. This quiz covers essential topics like ATP's role in muscle contraction and various energy systems. Challenge yourself to understand the intricacies of how energy is produced and utilized in muscles.