Ch 9: Intro To Muscular System

Question 1

What are the functions of muscular system

Answer 1

• movement of body (skeletal)
• posture (erector)
• respiration ( diaphram and accessory muscles)
• body heat (shivering)
• communication (gap junctions)
• constriction or organs and vessels (smooth muscle)
• contract of heart (cardiac muscle)

Question 2

What is excitability?

Answer 2

Capacity of muscle to respond to stimulis from nerve

Question 3

What is contractability?

Answer 3

Ability to move a muscle to shorten with force

Question 4

What is elasticity

Answer 4

Muscles recoils to original length after stretched

Question 5

What is extensibility

Answer 5

Muscle can be stretched to o its normal resting length and beyond to a limited degree

Question 6

Location of skeletal

Answer 6

Attached to bone

Question 7

Location of smooth muscle

Answer 7

Hollow organs, blood vessels

Question 8

Location of cardiac muscle

Answer 8

Heart

Question 9

Shape of skeletal

Answer 9

Very long and had striations (strips)

Question 10

Shape of smooth muscle

Answer 10

Spindle shape

Question 11

Shape of cardiac muscle

Answer 11

Striation and branched (stripes)

Question 12

Control of skeletal muscles

Answer 12

Voluntary and involuntary

Question 13

Control of smooth

Answer 13

Involuntary

Question 14

Control of cardiac

Answer 14

Involuntary

Question 15

Muscle fiber

Answer 15

Single muscle cell

Question 16

Endomysium

Answer 16

Surrounds muscle fiber

Question 17

Perimysium

Answer 17

Surrounds fasciculi

Question 18

Epimysium

Answer 18

Surrounds muscle

Question 19

Muscular fascia

Answer 19

Surrounds individual muscles and groups

Question 20

What are two myofilaments

Answer 20

• thick and thin

Question 21

What is thick myofilaments

Answer 21

Myosin

Question 22

Thin myofilaments

Answer 22

• actin
• tropomyosin
• troponin

Question 23

What is sacromeres

Answer 23

• contracting muscle fiber cell
• one Z-disks to the other Z-disks

Question 24

What are the characteristics of Thick myofilaments

Answer 24

• many elongated
• myosin head
• rod portion
• hinge region of myosin

Question 25

What are the characteristics of thin myofilaments

Answer 25

• actin
• contain active site
• tropomyosin
• troponin
• protein

Question 26

What is tropomyosin

Answer 26

Blocks in active site during relaxation

Question 27

Troponin

Answer 27

Binds to G-actin protein & tropomyosin

Question 28

Protein in thin myofilaments

Answer 28

Binds to ca 2+

Question 29

Sacromere

Answer 29

• H-zone: m- line and thick filaments only
• A-band: m-line and H-zone, and thick & thin filament
• m- line: m-line
• I-band: is light band and Z-disk and thin filaments

Question 30

During muscle contraction length of thick & thin filaments, what happens?

Answer 30

It doesn’t change

Question 31

H-zone and I-band

Answer 31

Change during muscle contraction