Muscular System Packet 1- Test 7

Question 1

How many muscles are in the muscular system?

Answer 1

Over 600

Question 2

T/F
About 60% of the human body weight comes from the muscles

Answer 2

False
About 40%

Question 3

What does the muscular system do?

Answer 3

• Helps with movement
• Supports posture
• Produces heat and energy
• Protects internal organs (not really though)
• Helps move blood, food, and waste products through the body
• Opens and Closes body openings

Question 4

What are the four common traits that all muscles have

Answer 4

• Excitability/ Irritability
• Contractability
• Extensibility
• Elasticity

Question 5

What is muscle tone

Answer 5

The ability for muscles to be slightly contracted at all times, even when not in use

Question 6

T/F
Tone allows a person to be in a state of readiness to act

Answer 6

True

Question 7

What is Excitability/ Irritability

Answer 7

• The ability to respond to a stimulus, such as a nerve or hormone
• Muscles can be stimulated electrically, mechanically, or chemically

Question 8

What is contractability

Answer 8

• The ability to shorten and produce movement when stimulated

Question 9

What is extensibility

Answer 9

• The ability to be stretched and lengthen, (AKA: Flexibility)

Question 10

What is elasticity

Answer 10

• The ability to return to its original shape after contracting or stretching

Question 11

What are the three MAIN types of muscles

Answer 11

• Cardiac
• Visceral
• Skeletal

Question 12

Where do skeletal bones attach

Answer 12

The bones by tendons

Question 13

Are muscles in the skeletal system voluntary or involuntary contractions?

Answer 13

USUALLY voluntary

Question 14

What does voluntary mean

Answer 14

You have to send a signal to your brain to move or do something

Question 15

What does involuntary mean

Answer 15

You DON’T have to think about moving a muscle

Question 16

T/F
The skeletal system helps produce body movement

Answer 16

True

Question 17

Are the skeletal system muscles striated or non-striated

Answer 17

Striated

Question 18

Is the muscles in the skeletal system multinucleated

Answer 18

Yes

Question 19

What are the two bands in a striated muscle

Answer 19

Light and Dark

Question 20

T/F
The light band on a striated muscle has a darker area called the H disk

Answer 20

False; It has a darker area called the Z disc

Question 21

T/F
The dark band has a lighter area called the H zone or bare zone

Answer 21

True

Question 22

Where are the visceral Muscles

Answer 22

In the walls of viscera, hollow organs, in the walls of blood vessels, and in the eyes

Question 23

Why do visceral muscles contract

Answer 23

To produce movement in the organs it’s located in

Question 24

Are visceral muscles multinucleated

Answer 24

No, they have only one nucleus

Question 25

Where is the cardiac muscle located

Answer 25

The walls of the heart

Question 26

Why does the cardiac muscle contract

Answer 26

To circulate blood

Question 27

Does a cardiac muscle have striations

Answer 27

Yes

Question 28

How do the cells look in a cardiac muscle

Answer 28

The cells are long and branching, and fit closely together at junctions

Question 29

T/F
The cardiac muscle has a centrally located nucleus

Answer 29

True

Question 30

Whole muscle structure of the belly

Answer 30

Fleshy body of muscle between slender point of attachments

Question 31

What is Fascia (Type of facia)

Answer 31

Layers of tough connective tissue surrounding large skeletal muscles

Question 32

What is Endomysium (Type of facia)

Answer 32

Surrounds individual muscle fibers

Question 33

What is Perimysium (Type of facia)

Answer 33

Surrounds small bundles of fibers

Question 34

What is Fascicles (Type of facia)

Answer 34

Bundles of muscle fibers

Question 35

What is Epimysium (Type of facia)

Answer 35

Outer layer of fascia

Question 36

What is a tendon (Type of facia)

Answer 36

A strong, cordlike fascia that extends toward and attaches to bone

Question 37

What is Sarcolemma (Muscle Fiber Structure)

Answer 37

cell membrane of a muscle fiber

Question 38

What is Sarcoplasm (Muscle Fiber Structure)

Answer 38

Muscle cell cytoplasm

Question 39

What are Myofilaments

Answer 39

Contractile elements of each muscular fiber (actin and myosin)

Question 40

What are Transverse Tubules (Muscle Fiber Structure)

Answer 40

Points of cell membrane