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Norepinephrine binds to

Which of the following ligaments is found within the knee joint cavity, attaching near the front of the tibia and the back of the femur, in order to prevent the tibia from sliding too far forward?

Which of the following best describes an axon?

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?