Muscular System

Question 1

Types of muscle tissue and location in body

Answer 1

1. Skeletal Muscle (voluntary): Compose skeletal muscle
2. Cardiac Muscle (involuntary): Found in the heart
3. Smooth Muscle (involuntary): Hollow organs such as the bladder, stomach, uterus, intestines, and passageways of circulatory system

Question 2

Properties of muscles

Answer 2

1. Exicability: Able to send electrical waves along the entire length
2. Elasticity: Having the ability to recoil back to its original length
3. Extensibility: Allows muscles to stretch or extend
4. Contractility: Allows muscles to pull on its attachment and shorten

Question 3

Fascicle

Answer 3

The muscle fibers that are arranged in bundles

Question 4

Epimysium

Answer 4

Outermost layer, surrounds entire muscle

Question 5

Sarcolemma

Answer 5

Muscle fiber membrane

Question 6

Myofibril

Answer 6

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

Question 7

Sarcoplasm

Answer 7

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

Question 8

Actin

Answer 8

Thin filaments

Question 9

Myosin

Answer 9

Thick filaments

Question 10

Subclavius

Answer 10

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

Question 11

Serratus Anterior

Answer 11

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

Question 12

Trapezius

Answer 12

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

Question 13

Rhomboid Major

Answer 13

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

Question 14

Pectoralis Major

Answer 14

Brings elbows together, moves elbow up (as during an uppercut punch). Target motion- flexion; adduction, medial rotation

Question 15

Latissimus Dorsi

Answer 15

Moves elbows back (as in elbowing someone standing behind you); spreads elbows apart. Target motion- Humerus: extension, adduction and medial rotation

Question 16

Deltoid

Answer 16

Lifts arms at the shoulder. Target motion- Abduction; flexion; extension medial and lateral rotation

Question 17

Supraspinatus

Answer 17

Rotates the elbow outwards, as during a tennis swing. Target motion- Abduction

Question 18

Teres Major

Answer 18

Assists the infraspinatus in rotating the elbow outwards

Question 19

Biceps Brachii

Answer 19

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

Question 20

Triceps Brachii

Answer 20

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

Question 21

Pronator Teres

Answer 21

Turns hand palm-down. Target motion- Pronation

Question 22

Supinator

Answer 22

Turns hand palm-up. Target motion- Supination

Question 23

Perimysium

Answer 23

Separates and surronds fascicles

Question 24

Endomysium

Answer 24

Surrounds each individual muscle fiber