CHAP 10 Quiz

Question 1

The three types of muscle tissue are

Answer 1

skeletal, cardiac and smooth

Question 2

A muscle can return to its original length when relaxed due to a quality of muscle tissue called

Answer 2

elasticity

Question 3

Muscle tissue can pull on its attachment points and shorten with force. This characteristic is called

Answer 3

contractility

Question 4

The fibers of this muscle are physically and electrically connected to each other so that the entire heart contracts as one unit (called a syncytium).

Answer 4

cardiac

Question 5

The fibers of this muscle are multinucleated. This type of muscle is

Answer 5

skeletal

Question 6

Which is the correct order of the connective tissue layers of a skeletal muscle, beginning with the deepest one?

Answer 6

endomysium, perimysium and epimysium

Question 7

This connective tissue layer of the skeletal muscles is found inside each fascicle and contains the extracellular fluid and nutrients to support the muscle fiber.

Answer 7

endomysium

Question 8

In skeletal muscle, the specialized smooth endoplasmic reticulum, which stores, releases, and retrieves calcium ions is called

Answer 8

sarcoplasmic reticulum

Question 9

These invaginations of the muscle cell membrane carry the action potential into the interior of the cell, and triggers the opening of calcium channels in the membrane of the adjacent sarcoplasmic reticulum (SR), causing Ca++ to diffuse out of the SR and into the sarcoplasm. These invaginations are known as the

Answer 9

T-tubules

Question 10

This protein covers the myosin-binding sites to prevent actin from binding to myosin. This protein is called

Answer 10

tropomyosin

Question 11

In general, a skeletal muscle is composed of

Answer 11

Veins, nerves, connective tissue sheaths and arteries.

Question 12

he neurons that stimulate muscle contraction are called ________ neurons.

Answer 12

motor

Question 13

Which letter is associated with the light band and contains only thin filaments?

Answer 13

I

Question 14

A motor unit consists of

Answer 14

a single motor neuron and the multiple muscle fibers it controls.

Question 15

The narrow space that separates the motor neuron and the skeletal muscle fiber in a neuromuscular junction is known as the

Answer 15

synaptic cleft

Question 16

When an action potential arrives at the knob of the motor neuron, calcium

Answer 16

enters through voltage-gated channels and triggers the release of transmitter

Question 17

The calcium ions involved in skeletal muscle contraction bind to a(n) ________ subunit.

Answer 17

troponin

Question 18

A power stroke involves

Answer 18

myosin head pulling a thin filament toward the center of the sarcomere

Question 19

The type of muscle fibers that are striated, form Y-shaped branches and are joined by intercalated discs are

Answer 19

cardiac

Question 20

In response to action potentials arriving along the transverse tubules, the sarcoplasmic reticulum releases

Answer 20

calcium ions