Ch 10 Muscle tissue

Question 1

what are skeletal muscles

Answer 1

muscles that are attached to the skeletal system

This allows us to move

Question 2

what are the 5 functions of the skeletal muscles

Answer 2

1. to produce movement
2. maintain posture or body position
3. support soft tissues
4. guard the entrances and exits of the body
5. maintain body temp by generating body heat

Question 3

At each end of the muscle the collagen fibers of the epidymiusm parimysium and endomymysuim come together to form a

Answer 3

Tendon

Question 4

Muscle tissue one of the four basic tissue groups consists chiefly of cells that are highly specialized for

Answer 4

Contraction

Question 5

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

Answer 5

Calcium ions

Question 6

Since each myofibril is attached at either end of the muscle fiber when sarcomeres shorten the muscle fiber

Answer 6

Shortens

Question 7

Each skeletal muscle fiber is controlled by a motor neuron at a single

Answer 7

Sarcomere

Question 8

The plasma membrane of a skeletal muscle fiber is called

Answer 8

Sarcolemma

Question 9

The repeating unit of a skeletal muscle fiber is the

Answer 9

Sarcomere

Question 10

The region of the sarcomere that always contains thin filaments is the

Answer 10

iBand

Question 11

A resting muscle generates most of its ATP by

Answer 11

Aerobic metabolism

Question 12

Which of the following types of muscle fibers are best adapted for prolonged contractions such as standing all day

Answer 12

Slow fibers

Question 13

Thin filaments are mostly made of the protein

Answer 13

Actin

Question 14

The region of the sarcomere containing the thick filament is the

Answer 14

H band

Question 15

The increase in muscle tension that is produced by increasing the number of active motor units is called

Answer 15

Recruitment

Question 16

How would an elevated level of thyroid hormone in the body affect skeletal muscles

Answer 16

It would stimulate energy use in heat production

Question 17

The bundle of collagen fibers at the end of a skeletal muscle that attaches muscle to bone is called a

Answer 17

Tendon

Question 18

Repeating unit of striated myofibrils

Answer 18

Sarcomere

Question 19

When calcium ion binds to troponin

Answer 19

Tropomyosin rolls away from the active site

Question 20

After death muscle fibers run out of ATP and calcium begins to leak from the sarcoplasmic reticulum into the sarcoplasm this results in a condition known as

Answer 20

Rigor mortis

Question 21

The area of the a band that contains no thin filaments is the

Answer 21

H band

Question 22

When a skeletal muscle fiber contracts the zones of overlap get

Answer 22

Larger

Question 23

During the time when the action potential moves through the sarcolemma a muscle twitch is in

Answer 23

Latent period

Question 24

Because the cells of skeletal muscle are relatively large and cylindrical in shape, they are also known as __________.

Answer 24

fibers

Question 25

Skeletal muscle cells have more than one nucleus.

Answer 25

True

Question 26

Each muscle cell is surrounded by thin connective tissue called the __________.

Answer 26

endomysium

Question 27

A cordlike structure that connects a muscle to another muscle or bone is __________.

Answer 27

a tendon

Question 28

The neuron and muscle fiber membranes do NOT actually touch but are separated by a fluid-filled gap

Answer 28

True

Question 29

The contractile unit of muscle is the __________.

Answer 29

sarcomere

Question 30

What process directly inhibits acetylcholine (ACh) release after a Botox® injection?

Answer 30

exocytosis

Question 31

A muscle fiber is ________.

Answer 31

a muscle cell

Question 32

What is the correct order of structures as you move from outside a muscle cell, to deep inside it?

Answer 32

fiber, myofibril, myofilament

Question 33

The actual contractile units of muscles extend from Z disc to Z disc. They are ________

Answer 33

sarcomeres

Question 34

This contractile protein forms the thin filaments.

Answer 34

actin

Question 35

This contractile protein is shaped like a golf club.

Answer 35

myosin

Question 36

The dark band of skeletal muscle consists of ________

Answer 36

both thick and thin filament

Question 37

This indentation of the sarcolemma carries electrical signals deep into the muscle cells.

Answer 37

T tubule

Question 38

From gross to microscopic, the parts of a muscle are _______

Answer 38

muscle, fascicle, fiber

Question 39

Each of the elements that make up a skeletal muscle is surrounded by connective tissue. Which words below correctly pair the connective tissue layer with the corresponding muscle structure?

Answer 39

fascicle: perimysium

Question 40

This strong, cord-like structure attaches muscles to bones.

Answer 40

tendon

Question 41

The neuromuscular junction consists of ________.

Answer 41

the axon terminal coming into close proximity to a muscle fiber

Question 42

The space between the axon terminal and the sarcolemma of a muscle fiber is called the ________.

Answer 42

synaptic cleft

Question 43

A neuron and all the muscle fibers it stimulates is called a ________

Answer 43

motor unit

Question 44

Sarcomeres consist of ________.

Answer 44

orderly arrangements of actin and myosin

Question 45

The thick and thin filaments are made up of ________, respectively.

Answer 45

myosin and actin

Question 46

An aponeurosis is ________.

Answer 46

similar to a tendon in function

Question 47

The function of the neuromuscular junction is to ________.

Answer 47

convey a signal from the nervous system to skeletal muscle

Question 48

At the neuromuscular junction, the electrical signal of the nerve ________

Answer 48

causes the axon terminal to release acetylcholine (ACh)

Question 49

Acetylcholine (ACh) is the neurotransmitter of axon terminals at the neuromuscular junction. It ________

Answer 49

binds to receptors on the muscle membrane

Question 50

The I-band consists of ________

Answer 50

thin filaments

Question 51

A triad consists of ________.

Answer 51

terminal cisternae and T-tubules