Muscular System

Question 1

responds to stimulation from nerve impulses.

Properties of Muscle

Answer 1

Irritability (Electrical Excitability) -

Question 2

responds to stimuli by contracting lengthwise, or shortening.

Properties of Muscle

Answer 2

Contractility

Question 3

muscle can be stretched up to 30% of its resting length.

Properties of Muscle

Answer 3

Extensibility

Question 4

after being stretched, have a tendency to recoil to their original resting length.

Properties of Muscle

Answer 4

Elasticity

Question 5

that are attached to the skeleton and are responsible for voluntary body movements. The muscle fibers are multi-nucleated, transversely striated and are grouped in parallel bundles called fasciculi.

Classification of Muscles

Answer 5

Skeletal muscles

Question 6

occur mainly in blood vessels and tubular organs of the GI tract, reproductive, urinary and respiratory systems
- Under autonomic control - they are involuntary.
- Muscle fibers are unstriated and contain a single nucleus.

Classification of Muscles

Answer 6

Smooth muscles

Question 7

• found only in the wall of the heart
• Unique property of auto-rhythmicity;
• Contractions are involuntary and have an intrinsic rhythm
• Intercalated discs that help hold adjacent cells together and transmit the force of contraction from cell to cell
• Striated

Classification of Muscles

Answer 7

Cardiac muscle

Question 8

are dense connective tissue that attaches the muscle to bone.

Structure of Skeletal Muscles

Answer 8

Tendons

Question 9

the less moveable attachment of the muscle

Structure of Skeletal Muscles

Answer 9

Origin

Question 10

The more moveable bony attachment of the muscle.

Structure of Skeletal Muscles

Answer 10

Insertion

Question 11

the fleshy thick part of the muscle; also called the gaster.

Structure of Skeletal Muscles

Answer 11

Belly

Question 12

binds individual fibers together and supports capillaries and nerve endings

Associated Connective Tissue

Answer 12

Endomysium

Question 13

another sheath covering that binds groups of muscle fibers together into bundles called fasciculi o supports the nerves and blood vessels that serve the surrounding fasciculi

Associated Connective Tissue

Answer 13

Perimysium

Question 14

sheath covering the entire muscle

Associated Connective Tissue

Answer 14

Epimysium

Question 15

a fibrous connective tissue that covers the muscle and attaches to the skin.

Associated Connective Tissue

Answer 15

Fascia

Question 16

decreases the angle of the joint

Functional Groups of Muscle

Answer 16

Flexor

Question 17

increases the angle of the joint

Functional Groups of Muscle

Answer 17

Extensor

Question 18

pull a limb toward the median plane

Functional Groups of Muscle

Answer 18

Adductor

Question 19

move the limb away from the median plane

Functional Groups of Muscle

Answer 19

Abductor

Question 20

Muscles that encircle an opening; either striated or smooth

Functional Groups of Muscle

Answer 20

Sphincter

Question 21

muscles directly responsible for producing the desired action

Functional Groups of Muscle

Answer 21

Agonist

Question 22

directly opposite that of the agonists

Functional Groups of Muscle

Answer 22

Antagonist

Question 23

muscles that oppose any undesired action of the agonists

Functional Groups of Muscle

Answer 23

Synergists