Muscular System

Question 1

Functions of Muscle

Answer 1

Movement, Stability, control openings, heat production(85%), glycemic control

Question 2

Characteristics of muscle

Answer 2

Excitability, conductivity, contractility, extensibility, elasticity

Question 3

Types of muscle tissue

Answer 3

Smooth/Involuntary, Cardiac, Skeletal/Voluntary

Question 4

Smooth/Involuntary Muscle characteristics

Answer 4

uninucleated, fusiform shape, no striation, slow sustained contraction

Question 5

Cardiac Muscle characteristics

Answer 5

Uninucleated, branched cells, striations, interclated discs, autorhythmic

Question 6

Skeletal/Voluntary Characteristics

Answer 6

Multinicleated, long cells, striations, respond to nerve stimulation

Question 7

Myofiber

Answer 7

Skeletal muscle cell

Question 8

Sarcolemma

Answer 8

Cell membrane of muscle cell

Question 9

Sarcoplasmic Reticulum

Answer 9

Endoplasmoc Reticulum of muscle cell

Question 10

Terminal Cisterns

Answer 10

End savs on sarcoplasmic reticulum

Question 11

Transverse tubules

Answer 11

Inavginstions of sarcolemma

Question 12

Componets of muscle

Largest to Smallest

Answer 12

1. Muscle
2. Fasicles
3. Muscle fiber
4. Myofibrils
5. Myofilaments

Question 13

Sarcomere Componets

Answer 13

Actin filaments (Thin)
Myosin filaments (Thick)
Dystrophin: Links actin go sarcolemma
Troponin tropomyosin complex: Cover active sites on actin
Z disc

Question 14

Muscle Coverings (Smallest to Largest)

Answer 14

1. Sarcolemma
2. Endomysium
3. Permysium
4. Epimysium

Question 15

Sarcolemma(Covering functions)

Answer 15

Cell membrane to muscle fiber

Question 16

Endomysium

Answer 16

Areolar connective, surrounds myofiber

Question 17

Perimysium

Answer 17

Dense irregular connective, covers fasicles

Question 18

Epimysium

Answer 18

Dense irregular comnective, covers all muscle till tendon

Question 19

A band

Answer 19

Dark; myosin overlaps myosin/actin filaments

Question 20

H bands

Answer 20

Middle of A, ONLY myosin filament

Question 21

I band

Answer 21

Light, ONLY actin

Question 22

Z line

Answer 22

Attachment point for actin filaments, marks sarcomere

Question 23

Motor unit

Answer 23

• One somatic nerve fiber and all myofibers innervated by that nerve
• Somatic nerve fires and stimulates all myofibers
• Strength of contraction depends on how many units called