In the figure, which represents a saddle joint? 
Definitions:
Optimum Temperature
The temperature at which a particular enzyme or metabolic process achieves its highest rate of activity.
Pancreatic Amylase
An enzyme produced by the pancreas that helps in the digestion of carbohydrates by breaking them down into simple sugars.
Salivary Amylase
An enzyme found in saliva that initiates the digestive process by breaking down starch into simpler sugars.
Biological Catalysts
Enzymes that speed up chemical reactions in the body without being consumed in the process.
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