The USDA created the food pyramid to encourage a healthy diet, but the USDA also has a mission to encourage agricultural products grown in the US. There can be a LOT of conflict between those two goals. So the food pyramid (ahem, I mean MyPlate) is not simply an objective summary of the available evidence.
The stretch reflex (myotatic reflex) is a muscle contraction in response to stretching within the muscle. It is a monosynaptic reflex which provides automatic regulation of skeletal muscle length. When a muscle lengthens, the muscle spindle is stretched and its nerve activity increases.
Tendon reflex (or T-reflex) may refer to: 1  A stretch reflex, when the stretch is created by a blow upon a muscle tendon. 2  This is the usual definition of the term. 3  A common example is the standard knee-jerk response when visiting the doctor. A stretch reflex, when the stretch is created by a blow upon a muscle tendon. 2  This is the usual definition of the term. 3  A common example is the standard knee-jerk response when visiting the doctor.