Muscular System

Question 1

(1) Types of muscle tissue and where can they be found in the body

Answer 1

Skeletal muscle (voluntary)- fibers are multinucleated structures that compose the skeletal muscle.

Question 2

(2) Types of muscle tissue and where can they be found in the body

Answer 2

Cardiac Muscle (involuntary)- only found in the heart

Question 3

(3) Types of muscle tissue and where can they be found in the body

Answer 3

Smooth muscle (involuntary)- 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

(1) Properties of muscles and definition

Answer 4

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

Question 5

(2) Properties of muscles and definition

Answer 5

Elasticity- Having the ability to recoil back to its original length

Question 6

(3) Properties of muscles and definition

Answer 6

Extensibility- Allows muscles to stretch or extend

Question 7

(4) Properties of muscles and definition

Answer 7

Contractility- 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

- Depression

Question 18

Serratus Anterior

Answer 18

• Moves arm from side of body to front of body; assists with inhalation
• Scapula: protracts, ribs: elevates

Question 19

Trapezius

Answer 19

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

Question 20

Rhomboid major

Answer 20

• Stabilizes scapula during pectoral girdle movement

- Retracts; rotates inferiorly

Question 21

Pectorallis major

Answer 21

• Brings elbow together; moves elbow up (as during an uppercut punch)
• Flexion; adduction; medial rotation

Question 22

Latissimus dorsi

Answer 22

• moves elbow back (as in elbowing someone standing behind you); spreads elbows apart
• humerus: extension, adduction, and medial rotation; scapula: depression

Question 23

Deltoid

Answer 23

• lifts arm at the shoulder

- abduction; flexion; extension; medial and lateral rotation

Question 24

Supraspinatus

Answer 24

• rotates the elbow outwards, as during a tennis swing

- abduction

Question 25

Teres major

Answer 25

• assists the infraspinatus in rotating the elbow outwards

- extension; abduction

Question 26

Biceps brachii

Answer 26

• performs a bicep curl; also allows palm of hand to point toward body while flexing
• flexion; supination

Question 27

Triceps brachii

Answer 27

• extends forearm, as during a punch

- extension

Question 28

Pronator teres

Answer 28

• turns hand palm-down

- pronation

Question 29

Supinator

Answer 29

• turns hand palm-up

- supination