Muscular system

Question 1

Z line

Answer 1

Separates one sarcomere from another

Question 2

how do muscle fibers shorten during contraction

Answer 2

Myosin cross-bridges attach, rotate, and detach from actin filaments causing the ends of the sarcomere to be pulled closer together.

Question 3

What is the role of acetocholine in muscle contraction

Answer 3

to propagate the action potential across the neuromuscular junction

Question 4

Myosin is considered

Answer 4

the power plant and transfers energy. Thick myosin grabs thin actin filaments

Question 5

actin

Answer 5

thin filament

Question 6

what is the the relationship between oxygen and muscles in aerobic exercise

Answer 6

slow twitch muscles take oxygen from the blood

Question 7

approximately how many muscles are attached to the skeleton to aid in movement

Answer 7

700

Question 8

smooth muscles is also called

Answer 8

visceral tissue

Question 9

cardiac muscle

Answer 9

has branched structure and intercalated discs that allow electrical impulses which are conduction from cell to cell and allows heart to beat as one unit

Question 10

skeletal muscle is

Answer 10

multinucleated

Question 11

agonist

Answer 11

muscles that produce movement

Question 12

antagonist

Answer 12

muscle that produces opposite motion

Question 13

tendons

Answer 13

attach muscles to bone. Largest tendon in the body is the Achilles tendon. tendons can also absorb some I,pact that muscles take when moving

Question 14

sarcomere is the

Answer 14

contracting unit of a muscle delineated by bands of myosin and actin filaments

Question 15

muscle largest to smallest

Answer 15

Muscle fasicle, muscle fiber, myofibril, sarcomere, sarcomere contains actin and myosin

Question 16

ATP is used for

Answer 16

contraction and is necessary for relaxation of the muscle

Question 17

muscle strain comprises

Answer 17

the stretching or tearing of the muscle

Question 18

sprain

Answer 18

an injury to the accompanying support ligaments and tendons of a muscle

Question 19

tendonitis

Answer 19

inflammation of the tendon

Question 20

amyotrophic lateral sclerosis (ALS)

Answer 20

neuromuscular junction is compromised. commonly known as Lou Gehrig’s disease. Motor neurons degenerate and die leading to loss of voluntary muscle movement

Question 21

muscular dystrophy

Answer 21

group of genetic disorders in which abnormal genes interfere with the production of proteins needed to form healthy muscles. nerves are not affected but muscles progressively degenerate and weaken. Both voluntary and involuntary muscles are compromised

Question 22

shivering reflex triggered by

Answer 22

posterior hypothalamus

Question 23

flexion

Answer 23

decreases angle between two body parts normally in sagittal plane

Question 24

extension

Answer 24

increases angle between two body parts. normally in sagittal plane

Question 25

dorsiflexion

Answer 25

ankle flexion toes towards shin

Question 26

plantar flexion

Answer 26

ankle extension. toes towards ground

Question 27

adduction

Answer 27

moving towards the midline

Question 28

abduction

Answer 28

moving away from the midline

Question 29

elevation

Answer 29

scapula movement, shoulder shrug superior movement

Question 30

depression

Answer 30

scapula movement. shoulder shrug inferior movement

Question 31

inversion

Answer 31

bringing sole of foot to face inward

Question 32

eversion

Answer 32

bringing sole of foot to face outward

Question 33

circumduction

Answer 33

twisting wrists

Question 34

pronation

Answer 34

rotating hand and wrist medially from the bone

Question 35

supination

Answer 35

rotating hand and wrist laterally from the bone

Question 36

rotation

Answer 36

turning head left or right

Question 37

what is released when an action potential reaches a muscle fiber

Answer 37

calcium ions

Question 38

calcium ion function

Answer 38

bind to the myosin and actin which assists in the binding of myosin heads of the thick filaments to the actin molecules of the thin filaments