quiz 1

Question 1

Tonic

Answer 1

Continual partial contraction; i.e. posture

Question 2

Isotonic

Answer 2

Muscle shortens but it’s tension increases; produce movement

Question 3

Isometric

Answer 3

Muscle length stays the same with increasing tension; no movement

Question 4

Twitch

Answer 4

Quick, jerky contraction in response to single stimulus; rare

Question 5

Tetanic

Answer 5

Sustained smooth contraction produced by a series of stimuli

Question 6

Treppe

Answer 6

Staircase phenomenon; muscles contract more forcefully after they have contracted a few times

Question 7

Fibrillation

Answer 7

Abnormal contraction where different muscle fibers contract at different times causing a “flutter”

Question 8

Convulsion

Answer 8

Uncoordinated tetanic contractions of varying groups of muscles

Question 9

General functions of muscular system

Answer 9

1. Movement
2. Posture
3. Heat production

Question 10

Reasons for names

Answer 10

1. It’s action
2. Direction of fibers
3. It’s location
4. Number of divisions
5. It’s shape, size
6. It’s points of attachment

Question 11

Characteristics of skeletal muscle tissue

Answer 11

1. voluntary
2. cells are called fibers
3. fibers are arranged in bundles called fascicles
4. Striated
5. Attached to bones via tendons
6. Supply the strongest contraction
7. mostly protein composed of filaments
8. many nuclei per fiber
9. many mitochondria per fiber
10. will fatigue
11. all or nothing law
12. graded response during contraction

Question 12

sarcolemma

Answer 12

cell membrane of muscle fiber

Question 13

sacroplasm

Answer 13

cytoplasm of muscle fiber

Question 14

sacroplasmic reticulum

Answer 14

analogous but not identical to endoplasmic reticulum of cells other than muscle fibers

Question 15

myofibrils

Answer 15

numerous fine fibers packed close together in sarcoplasm

Question 16

sarcomere

Answer 16

section of myofibril extending from one Z like to the next; each myofibril consists of many sarcomeres

Question 17

thick filaments

Answer 17

composed of myosin molecules; heads of myosin molecules help form cross bridges for contraction

Question 18

thin filaments

Answer 18

composed of actin, tropomyosin, and troponin molecules arranged in a complex fashion; alternate in myofibrils

Question 19

contraction

Answer 19

thick and thin filaments combine forming cross bridges. thin. filaments are pulled toward middle of sarcomere.

Question 20

origin

Answer 20

does not move

Question 21

prime

Answer 21

mover antagonist synergist

Question 22

inguinal canal

Answer 22

contains spermatozoa cords; hernia in men most prevalent

Question 23

femoral rings

Answer 23

hernia in females most prevalent

Question 24

bursae

Answer 24

small connective sacs lined with synovial membrane and containing synovial fluid

Question 25

subarcomial

Answer 25

between deltoid muscle and head of humerus and acromion process

Question 26

olecranon

Answer 26

between olecraneon process and skin; known as students elbow

Question 27

prepatellar

Answer 27

between patella and skin; inflammation called housemaids knee

Question 28

posture

Answer 28

position or alignment of body parts

Question 29

fibrosis

Answer 29

with advancing age some skeletal muscle fibers degenerate and are replaced with fibrous connective tissue

Question 30

nerve supply

Answer 30

one motorneuron, together with the skeletal muscle fibers it supplies is a motor unit.

Question 31

Reasons for names

Answer 31

1. It's action 2. Direction of fibers 3. It's location 4. Number of divisions 5. It's shape, size 6. It's points of attachment

Question 32

Characteristics of skeletal muscle tissue

Answer 32

1. voluntary 2. cells are called fibers 3. fibers are arranged in bundles called fascicles 4. Striated 5. Attached to bones via tendons 6. Supply the strongest contraction 7. mostly protein composed of filaments 8. many nuclei per fiber 9. many mitochondria per fiber 10. will fatigue 11. all or nothing law 12. graded response during contraction

Question 33

sarcolemma

Answer 33

cell membrane of muscle fiber

Question 34

sacroplasm

Answer 34

cytoplasm of muscle fiber

Question 35

sacroplasmic reticulum

Answer 35

analogous but not identical to endoplasmic reticulum of cells other than muscle fibers

Question 36

myofibrils

Answer 36

numerous fine fibers packed close together in sarcoplasm

Question 37

sarcomere

Answer 37

section of myofibril extending from one Z like to the next; each myofibril consists of many sarcomeres

Question 38

thick filaments

Answer 38

composed of myosin molecules; heads of myosin molecules help form cross bridges for contraction

Question 39

thin filaments

Answer 39

composed of actin, tropomyosin, and troponin molecules arranged in a complex fashion; thick filaments attach to Z lines, extend from them in toward center of sarcomeres; thick and thin filaments alternate in myofibrils

Question 40

contraction

Answer 40

thick and thin filaments combine forming cross bridges

Question 41

origin

Answer 41

does not move

Question 42

prime

Answer 42

mover antagonist synergist

Question 43

inguinal canal

Answer 43

contains spermatozoa cords; hernia in men most prevalent

Question 44

femoral rings

Answer 44

hernia in females most prevalent

Question 45

bursae

Answer 45

small connective sacs lined with synovial membrane and containing synovial fluid

Question 46

subarcomial

Answer 46

between deltoid muscle and head of humerus and acromion process

Question 47

olecranon

Answer 47

between olecraneon process and skin; known as students elbow

Question 48

prepatellar

Answer 48

between patella and skin; inflammation called housemaids knee

Question 49

posture

Answer 49

position or alignment of body parts

Question 50

fibrosis

Answer 50

with advancing age some skeletal muscle fibers degenerate and are replaced with fibrous connective tissue

Question 51

nerve supply

Answer 51

one motorneuron, together with the skeletal muscle fibers it supplies is a motor unit.