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Health Science 1 > Muscular System Packet 1- Test 7 > Flashcards

Muscular System Packet 1- Test 7 Flashcards

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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

A

Striated

18
Q

Is the muscles in the skeletal system multinucleated

A

Yes

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

A

True

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
Q

Where is the cardiac muscle located

A

The walls of the heart

26
Q

Why does the cardiac muscle contract

A

To circulate blood

27
Q

Does a cardiac muscle have striations

A

Yes

28
Q

How do the cells look in a cardiac muscle

A

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

29
Q

T/F
The cardiac muscle has a centrally located nucleus

A

True

30
Q

Whole muscle structure of the belly

A

Fleshy body of muscle between slender point of attachments

31
Q

What is Fascia (Type of facia)

A

Layers of tough connective tissue surrounding large skeletal muscles

32
Q

What is Endomysium (Type of facia)

A

Surrounds individual muscle fibers

33
Q

What is Perimysium (Type of facia)

A

Surrounds small bundles of fibers

34
Q

What is Fascicles (Type of facia)

A

Bundles of muscle fibers

35
Q

What is Epimysium (Type of facia)

A

Outer layer of fascia

36
Q

What is a tendon (Type of facia)

A

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

37
Q

What is Sarcolemma (Muscle Fiber Structure)

A

cell membrane of a muscle fiber

38
Q

What is Sarcoplasm (Muscle Fiber Structure)

A

Muscle cell cytoplasm

39
Q

What are Myofilaments

A

Contractile elements of each muscular fiber (actin and myosin)

40
Q

What are Transverse Tubules (Muscle Fiber Structure)

A

Points of cell membrane

41
Q
A

Health Science 1 (16 decks)

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