Muscular System

Question 1

Actin (thin) filaments are attached to a Z line, which is located in the middle of what trigonometry of the striations?

Answer 1

I band

Question 2

During muscle contractions, the sarcomeres shorten because _________

Answer 2

Thick and thin filament slide past one another, increasing their overlap

Question 3

What is the origin of brachioradalis?

Answer 3

Distal lateral humerus

Question 4

Some abdominal muscles are attached to a band of connective tissues that extend from the xiphoid process of the sternum to the pubic symhysis called ______ _________.

Answer 4

Linea Alba

Question 5

What are the actions of the tensor fasciae latae?

Answer 5

Abducts thigh and flex hip

Question 6

Numerous openings in the sarcolemma of a muscle fiber lead down into structures called the ______.

Answer 6

Transverse tubules

Question 7

What is the insertion of the brachioradalis?

Answer 7

Distal lateral radius

Question 8

In excitation-contraction coupling, the protein called _______ moves to expose binding sites on the actin filaments that can form from cross-bridges.

Answer 8

Tropomyosin

Question 9

A bundle of skeletal muscle fibers enclosed by a perimysium forms a(n) _________ within the muscle.

Answer 9

Fascicle

Question 10

What is the primary action of the supraspinatus muscle?

Answer 10

Abducts arm

Question 11

The bicep brachii is ______ to the brachialis muscle.

Answer 11

Superficial