Chapter 6 Pt. 1

Question 1

What are the traits that all muscles share?

Answer 1

1) are excitable
2) are contractile
3) are extensile
4) are elastic

Question 2

Contraction of skeletal muscles generates _____

Answer 2

heat

Question 3

What are synergistic muscles?

Answer 3

muscles that must contract at the same time to cause a certain movement

Question 4

What are antagonistic pairs?

Answer 4

produce a movement when one of the pair contracts and the other relaxes

Question 5

Most muscles are ___________ pairs

Answer 5

antagonistic

Question 6

When antagonistic muscle _________ an opposing action must relax.

Answer 6

contracts

Question 7

When antagonistic muscle contracts an opposing action must ______.

Answer 7

relax

Question 8

Most of the major muscles we use for locomotion, manipulation, and other voluntary movements are attached to ______

Answer 8

bones

Question 9

What are tendons?

Answer 9

a band of connective tissue

Question 10

What is an origin?

Answer 10

the end attached to the bone that remains relatively stationary during a movement

Question 11

What is insertion?

Answer 11

the end attached to the bone that moves

Question 12

What are some major muscles of the body?

Answer 12

1) triceps brachii
2) pectoralis major
3) serratus anterior
4) external oblique
5) rectus abdominis
6) adductor longus
7) sartorius
8) quadriceps femoris
9) tibialis anterior
10) biceps brachii
11) deltoid
12) trapezius
13) latissimus dorsi
14) gluteus maximus
15) hamstring group
16) gastrocnemius

Question 13

Which major muscle is this: straightens arms at elbow

Answer 13

triceps brachii

Question 14

Which major muscle is this: flexes and rotates arm

Answer 14

pectoralis major

Question 15

Which major muscle is this: helps raise arm, draws shoulder blade forward; useful in pushing

Answer 15

serratus anterior

Question 16

Which major muscle is this: assists in lateral twisting of body, compresses abdomen

Answer 16

external oblique

Question 17

Which major muscle is this: compresses abdomen and chest, bends backbone

Answer 17

rectus abdominis

Question 18

Which major muscle is this: rotates thigh laterally, flexes thigh, draws thigh toward body

Answer 18

adductor longus

Question 19

Which major muscle is this: bends lower leg at knee, bends and rotates thigh at hip

Answer 19

sartorius

Question 20

Which major muscle is this: flexes thigh at hips, extends log at knee

Answer 20

quadriceps femoris

Question 21

Which major muscle is this: flexes foot toward knee

Answer 21

tibialis anterior

Question 22

Which major muscle is this: bends forearm at elbow, rotates hand

Answer 22

biceps brachii

Question 23

Which major muscle is this: raises arm

Answer 23

deltoid

Question 24

Which major muscle is this: raises, turns, and lower the shoulder; turns head

Answer 24

trapezius

Question 25

Which major muscle is this: rotates and draws arm backward; helps in climbing

Answer 25

latissimus dorsi

Question 26

Which major muscle is this: extends and rotates thigh when walking or climbing

Answer 26

gluteus maximus

Question 27

Which major muscle is this: draws thigh backward, bends knee

Answer 27

hamstring group

Question 28

Which major muscle is this: extends foot away from knee; bends lower leg at knee

Answer 28

gastrocnemius

Question 29

What are fascicles?

Answer 29

smaller bundles that form the muscles

Question 30

Each _______ is wrapped in its own connective tissue sheath

Answer 30

fascicle

Question 31

Each fascicle is wrapped in its own __________ ______ ______

Answer 31

connective tissue sheath

Question 32

What are muscle fibers?

Answer 32

the actual muscle cells

Question 33

What is striated (striped) muscle?

Answer 33

muscles that have pronounced bands that look like stripes

Question 34

Striated (striped) muscle is also known as ________ _______

Answer 34

skeletal muscle

Question 35

Striations are caused by the orderly arrangement of many elongated _________

Answer 35

myofibrils

Question 36

What are myofibrils?

Answer 36

specialized bundles of proteins within the muscle cell

Question 37

Each myofibrils contains 2 types of the long protein filaments called ____________.

Answer 37

myofilaments

Question 38

Each myofibrils contains what 2 types of myofilaments?

Answer 38

1) Myosin filaments

2) Actin filaments

Question 39

Which type of myofilament is this:

thicker

Answer 39

Myosin filaments

Question 40

Which type of myofilament is this:

a greater number of thinner

Answer 40

Actin filaments

Question 41

Each myofibril has tens of thousands of contractile units called ___________

Answer 41

sarcomeres

Question 42

The ends of each sarcomere are marked by dark bands of protein known as __ _____

Answer 42

Z lines