Muscular System

Question 1

Skeletal muscle(voluntary)

Answer 1

Skeletal muscle fibers are multinucleated structures that compose the skeletal muscle.

Question 2

Cardiac muscle(involuntary)

Answer 2

Cardiac muscle are only found in the heart

Question 3

Smooth muscle(involuntary)

Answer 3

Smooth muscles are called so because they do not have striations. These can be found in hollow organs such as bladder, stomach, uterus, intestines, and passageways of circulatory system.

Question 4

Exicability

Answer 4

Able to send electrical waves (action potential) along the entire length

Question 5

Elasticity

Answer 5

Having the ability to recoil back to its original length

Question 6

Extensibility

Answer 6

Allows muscles to stretch or extend

Question 7

Contractility

Answer 7

Allows muscles to pull on its attachment and shorten

Question 8

Fascicle

Answer 8

The muscle fibers that are arranged in bundles

Question 9

Epimysium

Answer 9

Outermost layer, surrounds entire muscle

Question 10

Perimysium

Answer 10

Separates and surrounds fascicles

Question 11

Endomysium

Answer 11

Surrounds each individual muscle fiber

Question 12

Sarcolemma

Answer 12

Muscle fiber membrane

Question 13

Myofibril

Answer 13

Individual parallel muscle fibers (made up of actin and myosin)

Question 14

Sarcoplasm

Answer 14

Inner material surrounding the myofibril (equivalent to the cell’s cytoplasm)

Question 15

Actin

Answer 15

Thin filaments

Question 16

Myosin

Answer 16

Thick filaments

Question 17

subclavius

Answer 17

Stabilizes clavicle during movement by depressing it. Target motion- depression

Question 18

Serratus anterior

Answer 18

Moves arm from side of body to front of body; assists with inhalation. Target motion- Scapula- protracts ribs: elevates

Question 19

Trapezlus

Answer 19

Elevates shoulders(shrugging); pulls shoulder blades together; tilts head backwards. Target motion-Scapula: rotates inferiorly, retracts, elevates, and depresses; spine: extends

Question 20

Rhomboid major

Answer 20

Stabalizes scapula during pectoral girdle movement. Target motion- retracts; rotates inferiorly

Question 21

Pectoralls major

Answer 21

Brings elbows together: moves elbow up(ex. uppercut punch) target motion- flexion; abduction, medial rotation

Question 22

Latissimus dorsi

Answer 22

Moves elbow back(ex. elbowing someone standing behind you) spreads elbows apart. target motion- Humerus; extension, abduction, and medial rotation; scapula; depression

Question 23

Deltoid

Answer 23

Lifts arms at the shoulder. Target motion- abduction; flexion, extensions; medial and lateral rotation.

Question 24

Supraspinatus

Answer 24

Rotates the elbow outwards, as during a tennis swing. target motion- abduction

Question 25

Teres major

Answer 25

Assists the intraspinatus in rotating the elbow outwards. target motion- extension, adduction

Question 26

Biceps brachii

Answer 26

Performs a bicep curl; also allows palm of hand to point toward body while flexing. Target motion- flexion, supination

Question 27

Triceps brachii

Answer 27

Extends forearm, as during a punch. Target motion- extension

Question 28

Pronator teres

Answer 28

Turns hands palm-down. Target motion- pronation

Question 29

Supinator

Answer 29

Turns hand palm-up. Target motion- supination