creatin

Thân thiện

A scientist examines a creatin supplement in a laboratory.

Definition

1. 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.

Học thuật

Noun

1. 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

Từ đồng nghĩa

• creatine