Proteins are primarily used for tissue repairs and synthesis. They are polymers of amino acids used to make hormones, enzymes and other chemicals of the body. Therefore proteins are only reserved for synthesis and repairs of tissues.
During extreme starvation periods when then is no source of carbohydrates and adipose tissues has been depleted/used up, proteins are alternatively used as source of energy in form of amino acids that enters the liver. Tissues such as muscles are protein degraded to provide the brain with energy in form of ketone bodies and glucose, thus the weight loss in people suffering from malnutrition.
The enzyme that would be most important for digesting a skinless chicken breast would be a PEPTIDASE. A skinless chicken breast is a proteinous food and peptidases are enzymes which break down proteins by hydrolysis of the peptide bonds which joined the amino acids of proteins together.
Answer: Stimulus is something that causes a reaction, either positive or negative in the body of an organism. Examples includes, HEAT, COLD, PRESSURE, PAIN
