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Which of the purpose of myelination?

Which of the following synarthrotic, synchondrosis joints is found only in young, growing people?

The rapid transmission of an action potential along a myelinated axon, in which the electrical impulse jumps from one node of Ranvier to the next, increasing conduction speed.

The pubic symphysis is a cartilaginous joint. What is the primary purpose of this fibrocartilage?

Which ion is responsible for repolarization? 

Within a sarcomere, which structure anchors the thin filaments (actin) and elastic filaments (titin) in place, defining the boundary of each sarcomere?

A muscle originates on the anterior pelvis and inserts on the tibial tuberosity, crossing both the hip and knee joints. Based on its attachments, which actions would you expect this muscle to perform?

What is the main functional advantage of having transverse (T) tubules in skeletal muscle fibers?

The rotator cuff consists of 4 muscles that hold the head of the humerus in the glenoid cavity. These muscles together act as:

What is a sphincter muscle?