IB Sports, exercise and health science Topic A.2.3.1 ATP Production and Substrate Metabolism Revision Notes (SL/HL)

IB Sports, exercise and health science Topic A.2.3.1 ATP Production and Substrate Metabolism Revision Notes (SL/HL) | RevisionDojo

Written by official IB examiners

Metabolism

Definition

Metabolism

The total sum of all chemical reactions occurring in the body, including energy production and storage.

Metabolism refers to all chemical reactions that occur in the body to maintain life.
These reactions can be categorized into two main types:
1. Catabolism: The breakdown of molecules to release energy (e.g., breaking down glucose for ATP production).
2. Anabolism: The building of complex molecules using energy (e.g., muscle protein synthesis after exercise).

Definition

Anabolism

The metabolic process that builds complex molecules from simpler ones, using energy (e.g., muscle protein synthesis).

Definition

Catabolism

The metabolic process that breaks down complex molecules to release energy (e.g., breaking down glucose to produce ATP).

Note

When food is eaten, the body breaks it down through catabolism to extract glucose and other nutrients, which are then used to produce ATP.

Example

When eating food, the body metabolizes carbohydrates into glucose, which can be used for immediate energy or stored as glycogen.
During exercise, stored glycogen is broken down (catabolism) to provide ATP for muscle contractions.

Hint

Memory hook: Anabolism Adds, Catabolism Cuts.
Both phases run constantly, with ATP linking them: catabolism captures the energy released, anabolism uses it to build.

Mitochondria

Mitochondria are organelles found in cells that are responsible for producing ATP through aerobic metabolism.
They are often referred to as the "powerhouses of the cell" because they generate most of the body's ATP.

Mitochondria are the main site of aerobic ATP production

Site of aerobic metabolism: Mitochondria contain the biochemical pathways of the Krebs cycle and electron transport chain. These pathways produce ATP efficiently.
Mitochondria require oxygen to generate ATP.
Mitochondria metabolise carbohydrates and fats, so they are essential for endurance activities.

Example

A marathon runner relies on mitochondria to efficiently produce ATP over long distances.
Their training improves mitochondrial density and efficiency, increasing aerobic endurance.

Aerobic ATP production includes these major steps:
Glycolysis (in cytoplasm): breaks glucose into pyruvate.
Krebs Cycle (in mitochondria): further breaks down pyruvate to release high-energy electrons.
Electron Transport Chain (ETC) (in mitochondria): transfers electrons and produces ATP.

Definition

Krebs cycle

A series of biochemical reactions occurring in the mitochondria that further break down pyruvate to release high-energy electrons, contributing to ATP production.

Definition

Electron Transport Chain (ETC)

A series of protein complexes in the mitochondria that transfer electrons to produce ATP during aerobic metabolism.

ATP is the body's energy currency

ATP (adenosine triphosphate) is a high-energy molecule that stores and supplies energy for biological functions.
Adenosine group: an adenine base joined to a ribose sugar.
Three phosphate groups: attached in a chain to the adenosine.
Energy-rich bonds: the bonds between the phosphate groups store usable energy; breaking the last phosphate releases a large amount of energy for cellular work.

How ATP provides energy

ATP releases energy when the third phosphate bond breaks, converting ATP into ADP (adenosine diphosphate) + Pi (inorganic phosphate).
This energy powers muscle contractions, nerve transmission, and biochemical reactions.
ATP → ADP + Pi + Energy
Pi = inorganic phosphate

Nice try, unfortunately this paywall isn't as easy to bypass as you think. Want to help devleop the site? Join the team at https://revisiondojo.com/join-us. exercitation voluptate cillum ullamco excepteur sint officia do tempor Lorem irure minim Lorem elit id voluptate reprehenderit voluptate laboris in nostrud qui non Lorem nostrud laborum culpa sit occaecat reprehenderit

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit.

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

Unlock the rest of this chapter with a free account

Metabolism

Definition

Metabolism

The total sum of all chemical reactions occurring in the body, including energy production and storage.

Metabolism refers to all chemical reactions that occur in the body to maintain life.
These reactions can be categorized into two main types:
1. Catabolism: The breakdown of molecules to release energy (e.g., breaking down glucose for ATP production).
2. Anabolism: The building of complex molecules using energy (e.g., muscle protein synthesis after exercise).

Definition

Anabolism

The metabolic process that builds complex molecules from simpler ones, using energy (e.g., muscle protein synthesis).

Definition

Catabolism

The metabolic process that breaks down complex molecules to release energy (e.g., breaking down glucose to produce ATP).

Note

When food is eaten, the body breaks it down through catabolism to extract glucose and other nutrients, which are then used to produce ATP.

Example

When eating food, the body metabolizes carbohydrates into glucose, which can be used for immediate energy or stored as glycogen.
During exercise, stored glycogen is broken down (catabolism) to provide ATP for muscle contractions.

Hint

Memory hook: Anabolism Adds, Catabolism Cuts.
Both phases run constantly, with ATP linking them: catabolism captures the energy released, anabolism uses it to build.

Mitochondria

Mitochondria are organelles found in cells that are responsible for producing ATP through aerobic metabolism.
They are often referred to as the "powerhouses of the cell" because they generate most of the body's ATP.

Mitochondria are the main site of aerobic ATP production

Site of aerobic metabolism: Mitochondria contain the biochemical pathways of the Krebs cycle and electron transport chain. These pathways produce ATP efficiently.
Mitochondria require oxygen to generate ATP.
Mitochondria metabolise carbohydrates and fats, so they are essential for endurance activities.

Example

A marathon runner relies on mitochondria to efficiently produce ATP over long distances.
Their training improves mitochondrial density and efficiency, increasing aerobic endurance.

Aerobic ATP production includes these major steps:
Glycolysis (in cytoplasm): breaks glucose into pyruvate.
Krebs Cycle (in mitochondria): further breaks down pyruvate to release high-energy electrons.
Electron Transport Chain (ETC) (in mitochondria): transfers electrons and produces ATP.

Definition

Krebs cycle

A series of biochemical reactions occurring in the mitochondria that further break down pyruvate to release high-energy electrons, contributing to ATP production.

Definition

Electron Transport Chain (ETC)

A series of protein complexes in the mitochondria that transfer electrons to produce ATP during aerobic metabolism.

ATP is the body's energy currency

ATP (adenosine triphosphate) is a high-energy molecule that stores and supplies energy for biological functions.
Adenosine group: an adenine base joined to a ribose sugar.
Three phosphate groups: attached in a chain to the adenosine.
Energy-rich bonds: the bonds between the phosphate groups store usable energy; breaking the last phosphate releases a large amount of energy for cellular work.

How ATP provides energy

ATP releases energy when the third phosphate bond breaks, converting ATP into ADP (adenosine diphosphate) + Pi (inorganic phosphate).
This energy powers muscle contractions, nerve transmission, and biochemical reactions.
ATP → ADP + Pi + Energy
Pi = inorganic phosphate

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A.1 Communication3 subtopics

A.2 Hydration and nutrition3 subtopics

A.3 Response3 subtopics

B.1 Generating movement in the body4 subtopics

B.2 Forces, motion and movement3 subtopics

B.3 Injury2 subtopics

C.1 Individual differences2 subtopics

C.2 Motor learning2 subtopics

C.3 Motivation3 subtopics

C.4 Stress and coping2 subtopics

C.5 Psychological skills2 subtopics

IB Sports, exercise and health science A.2.3.1 ATP Production and Substrate Metabolism Notes

A.1 Communication3 subtopics

A.2 Hydration and nutrition3 subtopics

A.3 Response3 subtopics

B.1 Generating movement in the body4 subtopics

B.2 Forces, motion and movement3 subtopics

B.3 Injury2 subtopics

C.1 Individual differences2 subtopics

C.2 Motor learning2 subtopics

C.3 Motivation3 subtopics

C.4 Stress and coping2 subtopics

C.5 Psychological skills2 subtopics

Metabolism

Mitochondria

Mitochondria are the main site of aerobic ATP production

ATP is the body's energy currency

How ATP provides energy

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Metabolism

Mitochondria

Mitochondria are the main site of aerobic ATP production

ATP is the body's energy currency

How ATP provides energy

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account