creatin
Definition
- Noun:
- A nitrogenous organic acid: Creatin (also spelled creatine) is a naturally occurring compound, specifically an amino acid derivative, synthesized in the liver, kidneys, and pancreas.
- A metabolic compound in muscle tissue: It is not used to build proteins but is primarily stored in vertebrate muscle tissue, both in its free form and as phosphocreatine.
- An energy supplier: Its primary biological role is to supply rapid energy for muscle contraction by helping to regenerate adenosine triphosphate (ATP).
Usage Examples
- Noun:
- The body synthesizes creatin from amino acids.
- Athletes sometimes supplement with creatin to improve performance during high-intensity exercise.
- Phosphocreatine, a form of creatin, acts as a readily available energy reserve in muscles.
Advanced Usage
- "Creatine phosphate" / "Phosphocreatine": The high-energy, phosphorylated form of creatine stored in muscles, which directly donates a phosphate group to ADP to quickly resynthesize ATP.
- During a short sprint, muscles rely heavily on the breakdown of creatine phosphate for energy.
- "Creatine kinase": An enzyme that catalyzes the transfer of a phosphate group between creatine and ATP/ADP.
- Elevated levels of creatine kinase in the blood can indicate muscle damage.
Variants and Related Words
- Creatine (n): The more common modern spelling of "creatin".
- Phosphocreatine (n): The phosphorylated, energy-storing form of creatine in muscle cells.
- Creatinine (n): A waste product formed from the breakdown of creatine, filtered from the blood by the kidneys and excreted in urine.
Synonyms
- N(alpha)-methylguanidinoacetic acid: The systematic chemical name for creatine.
- Energy substrate: A substance used by the body to produce energy (describes its function).
Related Phrases / Compounds
- Creatine supplementation: The practice of consuming creatine, often as a monohydrate powder, to increase intramuscular stores.
- Extensive research supports the efficacy of creatine supplementation for strength and power athletes.
- Creatine shuttle: A theoretical model describing the movement of creatine and phosphocreatine within muscle cells to transport energy from mitochondria to sites of ATP consumption.
Noun
-
an amino acid that does not occur in proteins but is found in the muscle tissue of vertebrates both in the free form and as phosphocreatine; supplies energy for muscle contraction
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