Quiz 6: The Muscular System

Question 1

According to the sliding filament theory, how does muscle contraction occur?

Answer 1

Myosin heads form cross bridges and pull thin filaments, causing them to slide

Question 2

The heads of the myosin myofilaments are called ________ when they link the thick and thin filaments together during skeletal muscle contraction.

Answer 2

Cross bridges

Question 3

Muscle tissue has the ability to shorten when adequately stimulated, a characteristic known as ________.

Answer 3

Contractility

Question 4

One neuron and all the skeletal muscles it stimulates is known as a ________.

Answer 4

Motor unit

Question 5

Muscles that perform opposite actions to one another are termed ________.

Answer 5

Antagonists

Question 6

The point of muscle attachment to an immovable or less movable bone is known as the ________.

Answer 6

Origin

Question 7

What is the unstoppable electrical current that travels down the length of the entire surface of a sarcolemma?

Answer 7

Action potential

Question 8

A smooth, sustained contraction, with no evidence of relaxation, is called ________.

Answer 8

Fused, or complete, tetanus

Question 9

What organelle wraps and surrounds the myofibril and stores calcium?

Answer 9

Sarcoplasmic reticulum

Question 10

Contractions in which muscles shorten and produce movement are known as ________.

Answer 10

Isotonic contractions