Study Notes on Enzymes, Cellular Respiration, and Metabolic Reactions

Enzymes and Cellular Reactions

  • Enzymes

    • Proteins that speed up reactions by facilitating catalytic reactions.

Cellular Respiration Overview

  • First step of cellular respiration: Inhalation of oxygen.

  • Purpose of metabolism:

    • Remove waste

    • Produce energy

    • Main end products: Carbon dioxide and water.

    • Excess energy is lost as heat.

Energy and Entropy

  • Energy lost as heat represents entropy, which is considered useless energy.

Water Retention and Health Implications

  • Importance of not retaining water:

    • Retained water can lead to swelling (edema), coma, or death.

    • Retaining feces can lead to infection.

Constipation

  • Caused by poor diet lacking in fiber and vegetables.

  • Excessive consumption of animal products can worsen constipation.

Anabolic and Catabolic Reactions

  • Anabolic Reactions:

    • Dehydration synthesis.

    • Building larger molecules from smaller ones; water is released as a by-product when making bonds.

  • Catabolic Reactions:

    • Hydrolysis (breaking down of molecules with the addition of water).

    • Release energy (ATP) when breaking down substances.

Energy Types

  • Endothermic: Requires energy (heat).

  • Exothermic: Releases energy (heat).

  • Coupled Reactions: Anabolic and catabolic processes occur simultaneously, with energy and materials being exchanged between them.

ATP (Adenosine Triphosphate)

  • Continuous production as long as the body is alive.

  • Structure: Contains adenosine and three phosphate groups.

  • When ATP is broken down:

    • Energy is released.

    • Converts to ADP (Adenosine Diphosphate) and inorganic phosphate (P_i).

Organic vs Inorganic Compounds

  • Organic Compounds: Must contain carbon (and usually hydrogen).

  • Example: Glucose is organic; Carbon dioxide is inorganic as it lacks suitable carbon bonding.

Summary of ATP Cycle

  • Break down food for energy (cellular respiration).

  • Energy from ATP is used for cellular processes.

  • Essential to understand the mechanisms of energy transfer in metabolism for effective functioning of bodily systems.