Muscular Structure

Question 1

What makes up a Triad in a muscle cell

Answer 1

2 terminal cisternae + 1 Transverse tubule

Question 2

Sarcolemma

Answer 2

Membrane of a single muscle cell/fiber

Question 3

Transverse Tubules (T-tubule)

Answer 3

maintain property of muscle fiber membrane

Carry signals from nerves deep into muscle fiber through its lumen

Question 4

Terminal Cisternae

Answer 4

Store + release calcium

Question 5

Sarcoplasmic Reticulum

Answer 5

Store + release calcium

Question 6

What is a Muscle Fiber made of?

Answer 6

Made of myofibrils

Very long → thus called “Fibers” and not cells

Question 7

What is a Fascicle?

Answer 7

Bundle of muscle fibers

Question 8

What is Endomysium?

Answer 8

Layer of deep fascia
Surrounds an individual muscle fiber

Question 9

What is Epimysium?

Answer 9

Layer of deep fascia that Surrounds whole muscle

Question 10

What is Fasia?

Answer 10

Dense irregular connective tissue deep to the skin.

Question 11

What are the two kinds of Fasia

Answer 11

→ Superficial Fasia: thin spider-weby dense connective tissue beneath skin

→ Deep(Muscular) Fasia: epimysium, perimysium, endomysium

Question 12

What is the Perimysium

Answer 12

Part of deep muscular fasia
Forms fesicle
Surrounds bunches of muscle fibers

Question 13

What is a myofibril?

Answer 13

Contractile proteins grouped within muscle cell

Example: The myofibrils in muscle cells are responsible for muscle contraction.

Question 14

What is a sarcomere

Answer 14

Structural, functional contractile unit of a muscle cell

Space from one Z-disc to another Z-disc

Question 15

M line

Answer 15

Midsection of A band

Question 16

A Band (Dark Band)

Answer 16

Made of thick filaments

Question 17

Sarcomere

Answer 17

Structural, functional contractile unit of a muscle cell

Question 18

I Band (Light Band)

Answer 18

Thin filaments + Z disc

Question 19

H Zone

Answer 19

Space where contraction occurs, disappears during contraction

Question 20

What are the two types of myofilaments?

Answer 20

Thick filaments
Thin filaments

Question 21

Contractile proteins

Answer 21

myosin and actin

they do the work

Question 22

Regulatory proteins

Answer 22

tropomyosin and troponin

involved in the start/stop contraction

Question 23

Explain Thick filaments

Answer 23

Made of Myosin
Cross bridges- have actin binding sites
ATP binds to myosin head

Question 24

ExplainThin filaments

Answer 24

Made of Actin
Contain Tropomyosin and Troponin

Question 25

Function of tropomyosin

Answer 25

Block myosin binding site

Question 26

Function of troponin

Answer 26

Binds to Acton, tropomyosin and calcium

Question 27

Troponin-Tropomyosin complex

Answer 27

When bound with calcium, troponin complex changes shape