Muscular system

Question 1

A band

Answer 1

Middle band

Question 2

I band

Answer 2

Between A band and M line

Question 3

M line

Answer 3

Outer band

Question 4

Myosin

Answer 4

Thick filament

Question 5

Actin

Answer 5

Small, short horizontal bands

Question 6

Z line

Answer 6

Zig zag lines lateral to h zone

Question 7

H zone

Answer 7

small vertical bands in middle of fiber

Question 8

Thick filament name

Answer 8

Myosin

Question 9

Thin filament name

Answer 9

Actin

Question 9

Actin binding site

Answer 9

Bulb on myosin

Question 10

Tail

Answer 10

Extension of head

Question 11

Tropomyosin

Answer 11

Cord on actin

Question 12

Troponin

Answer 12

Small molecules

Question 12

Troponin

Answer 12

Small molecules

Question 13

What are the coupled proteins of muscles?

Answer 13

Actin and Myosin

Question 14

What are the 2 movements of muscles?

Answer 14

Contracting and relaxing

Question 15

What are the 3 types of muscles?

Answer 15

Skeletal, smooth, and cardiac

Question 16

How many muscles are there in the body?

Answer 16

639

Question 17

Each muscle has what 3 structures?

Answer 17

Artery, nerve, vein

Question 18

What is a muscle fiber? Where is it found? What is its purpose? What parts/organelles are involved?

Answer 18

Muscle cell, muscles, contract/relax, tropomyosin, troponin

Question 19

What is a fascicle? Where is it located?

Answer 19

Band of muscle fibers, muscle

Question 20

What are muscles made of?

Answer 20

Fascicles

Question 21

What are the 3 connective tissue sheets? Where are they located?

Answer 21

Epimysium (outside), perimysium (outside fascicles), endomysium (inside fascicles)

Question 22

Proteins change shape after ___________

Answer 22

binding

Question 23

Changing shapes allows proteins to ________/__________ with other stuff

Answer 23

bind/unbind

Question 24

What is a sarcomere? What proteins do they have?

Answer 24

Segment of muscle fiber, actin and myosin

Question 25

Actin is a ______ fiber

Answer 25

Thin

Question 26

Myosin is a ______ fiber

Answer 26

Thick

Question 27

What does the z line do?

Answer 27

Defines border of filaments

Question 28

What blocks the binding site on the actin filament?

Answer 28

Tropomysin and troponin

Question 29

What role does the multiple nuclei serve the muscle fiber?

Answer 29

More mitochondria

Question 30

What is the homologous structure for the endoplasmic reticulum, and what purpose does it have?

Answer 30

Sarcoplasmic reticulum, handles Ca++ to contract

Question 31

T Tubule purpose

Answer 31

Triggers movement by opening calcium channel

Question 32

What part of the actin filament does calcium bind to? What was blocking the binding site?

Answer 32

Troponin, actin, tropomyocin

Question 33

What molecule does myosin head bind to to become active?

Answer 33

ATP

Question 34

Sliding filament model

Answer 34

Myosin binds to ATP, myosin head extends and binds to actin and contracts

Question 35

How many ATPs are needed for each myosin head

Answer 35

1

Question 36

What is a cross bridge?

Answer 36

Where myosin and actin attach

Question 37

What is a power stroke?

Answer 37

Step after cross bridge causing release of energy

Question 38

Why do you need calcium for muscle contraction?

Answer 38

Allows actin and myosin to interact