Muscular System Packet 1- Test 7 Flashcards

1
Q

How many muscles are in the muscular system?

A

Over 600

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2
Q

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

A

False
About 40%

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3
Q

What does the muscular system do?

A
  • 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
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4
Q

What are the four common traits that all muscles have

A
  • Excitability/ Irritability
  • Contractability
  • Extensibility
  • Elasticity
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5
Q

What is muscle tone

A

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

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6
Q

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

A

True

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7
Q

What is Excitability/ Irritability

A
  • The ability to respond to a stimulus, such as a nerve or hormone
  • Muscles can be stimulated electrically, mechanically, or chemically
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8
Q

What is contractability

A
  • The ability to shorten and produce movement when stimulated
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9
Q

What is extensibility

A
  • The ability to be stretched and lengthen, (AKA: Flexibility)
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10
Q

What is elasticity

A
  • The ability to return to its original shape after contracting or stretching
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11
Q

What are the three MAIN types of muscles

A
  • Cardiac
  • Visceral
  • Skeletal
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12
Q

Where do skeletal bones attach

A

The bones by tendons

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13
Q

Are muscles in the skeletal system voluntary or involuntary contractions?

A

USUALLY voluntary

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14
Q

What does voluntary mean

A

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

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15
Q

What does involuntary mean

A

You DON’T have to think about moving a muscle

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16
Q

T/F
The skeletal system helps produce body movement

A

True

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17
Q

Are the skeletal system muscles striated or non-striated

18
Q

Is the muscles in the skeletal system multinucleated

19
Q

What are the two bands in a striated muscle

A

Light and Dark

20
Q

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

A

False; It has a darker area called the Z disc

21
Q

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

22
Q

Where are the visceral Muscles

A

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

23
Q

Why do visceral muscles contract

A

To produce movement in the organs it’s located in

24
Q

Are visceral muscles multinucleated

A

No, they have only one nucleus

25
Where is the cardiac muscle located
The walls of the heart
26
Why does the cardiac muscle contract
To circulate blood
27
Does a cardiac muscle have striations
Yes
28
How do the cells look in a cardiac muscle
The cells are long and branching, and fit closely together at junctions
29
T/F The cardiac muscle has a centrally located nucleus
True
30
Whole muscle structure of the belly
Fleshy body of muscle between slender point of attachments
31
What is Fascia (Type of facia)
Layers of tough connective tissue surrounding large skeletal muscles
32
What is Endomysium (Type of facia)
Surrounds individual muscle fibers
33
What is Perimysium (Type of facia)
Surrounds small bundles of fibers
34
What is Fascicles (Type of facia)
Bundles of muscle fibers
35
What is Epimysium (Type of facia)
Outer layer of fascia
36
What is a tendon (Type of facia)
A strong, cordlike fascia that extends toward and attaches to bone
37
What is Sarcolemma (Muscle Fiber Structure)
cell membrane of a muscle fiber
38
What is Sarcoplasm (Muscle Fiber Structure)
Muscle cell cytoplasm
39
What are Myofilaments
Contractile elements of each muscular fiber (actin and myosin)
40
What are Transverse Tubules (Muscle Fiber Structure)
Points of cell membrane
41