Lecture #6

Question 1

Skeletal Muscle Function

Answer 1

Responsible for movement of body and all of its joints

Question 2

Skeletal Muscle Function

Answer 2

Muscle contraction produces force that causes joint movement

Question 3

Muscles Provide…

Answer 3

Protection
Dynamic stability joints
Posture and support
Produce body heat

Question 4

Muscle Shape

Answer 4

Cross Section Diameter

Question 5

Greater cross section diameter =

Answer 5

Greater force excertion

Question 6

Muscle Fiber Arrangements

Answer 6

Parallel and Pennate

Question 7

Parallel Fiber Arrangement

Answer 7

Fibers arranged parallel to muscle length

Question 8

Function of Parallel Fiber Arrangement

Answer 8

Produce greater range of movement than similar sized muscles w/pennate arrangement

Question 9

Parallel Muscle Categories

Answer 9

Flat
Fusiform
Strap
Radiate
Sphincter/Circular

Question 10

Flat Muscle Appearance

Answer 10

Usually thin and broad, originating from broad, fibrous, sheet-like aponeuroses

Question 11

Flat Muscle Functions

Answer 11

Spread there forces over a broad area

Question 12

Fusiform Muscle Appearance

Answer 12

Spindle-shaped with a central belly that tapers to tendons on each end

Question 13

Fusiform Muscle Function

Answer 13

Allows them to focus their power onto small, bony targets

Question 14

Strap Muscles Appearance

Answer 14

More uniform in diameter w/essentially all fibers arranged in a long parallel manner

Question 15

Strap Muscles Functions

Answer 15

Enables a focusing of power onto small, bony targets

Question 16

Radiate Muscles Appearance

Answer 16

Triangular, fan-shaped or convergent and have a combined arrangement of flat and fusiform

Question 17

Radiate Muscles Function

Answer 17

Originate on broad aponeuroses and converge onto a tendon

Question 18

Sphincter/Circular Muscles Appearance

Answer 18

Technically endless strap muscles

Question 19

Sphincter/Circular Muscles Function

Answer 19

Surround openings and function to close them upon contraction

Question 20

Pennate Fiber Arrangement

Answer 20

Shorter fibers and arranged obliquely to their tendons similar to a feather

Question 21

Pennate Fiber Arrangement Functions

Answer 21

Arrangement increases the cross-sectional area of the muscle, thereby increasing the power

Question 22

Pennate Muscle Fiber Categories

Answer 22

Unipennate
Bipennate
Multipennate

Question 23

Unipennate Muscles

Answer 23

Fibers run obliquely from a tendon on one side only

Question 24

Bipennate Muscles

Answer 24

Fibers run obliquely on both sides from a central tendon

Question 25

Multipennate Muscles

Answer 25

Have several tendons with fibers running diagonally between them

Question 26

Strongest Muscle Contractions

Answer 26

Uni/Bipennate Muscles

Question 27

Muscle Tissue Properties

Answer 27

Irritability/excitability, Contractility, Extensibility, Elasticity

Question 28

Irritability/Excitability

Answer 28

Muscle property of being sensitive or responsive to chemical, electrical, or mechanical stimuli

Question 29

Contractility

Answer 29

Ability of muscle to be passively stretched beyond its normal resting length

Question 30

Extensibility

Answer 30

Ability of muscle to be passively stretched beyond its normal resting length

Question 31

Elasticity

Answer 31

Ability of muscle to return to its original length following stretching