Curling into the “fetal position” ________ the intervertebral joints.

The functional unit of a skeletal muscle fiber is the

A ________ is a rigid structure that moves on a fixed point.

Bonus What is the main function of the quadriceps femoris group:

When a muscle fiber contracts, the I bands diminish in size, the H zones disappear, and the A bands move closer together but do not diminish in length.

A common injury to the ankle occurs by excessive turning of the sole inward, called

_____ – cylindrical structure that consists of myofilaments; actively shorten; when they contract the entire muscle cell shortens

Isometric contractions produce:

There is limited movement between the ribs and the sternum. Such joints are classified structurally as

When energy reserves in a muscle are exhausted and lactic acid levels increase, ________ occurs.