Muscle Hisology

Question 1

What are the functions of Muscular tissue?

Answer 1

• Support the body
• Produce body movement
• Move substances in body
• Produce Heat
• Protect internal organs and stabilize joints

Question 2

What are the characteristics of muscle?

Answer 2

1. Excitable
2. Contractible
3. Extensible
4. Elastic

Question 3

What are Aerobic Type I red fibers?

Answer 3

Small, slow-twitch fibers.

Question 4

What are Anaerobic Type II White Fibers?

Answer 4

Large, Fast-twitch fibers.

Question 5

What are intermediate fibers?

Answer 5

Intermediate diameter, speed, and tension.

Question 6

What are the characteristics of Skeletal muscle? (Shape, nucleus, striation, control, T-System, Special features, Endomysium, regenerative

Answer 6

• Long cylindrical
• Multiple nucleus, peripheral
• Striated
• Voluntary
• Uses T-system.
• Endomysium present
• Regenerative

Question 7

What are the characteristics of Caridac muscle? (Shape, nucleus, striation, control, T-System, Special features, Endomysium, regenerative

Answer 7

• Branched
• Single nucleus usually, centered
• Striated
• Innvoluntary
• Intercalated Disks
• Uses T System
• not regenerative
• Endomysium present

Question 8

What are the characteristics of Smooth muscle? (Shape, nucleus, striation, control, T-System, Special features, Endomysium, regenerative

Answer 8

• Fusiform shape
• Single centered nucleus
• Non striated
• Uses Calmodulin
• Innvoluntary
• No Endomysium
• Regenerative
• No T-System

Question 9

what are other terms for muscle cell?

Answer 9

Myofiber, Myocyte.

Question 10

What are the 3 different CT that are in the muscle cells?

Answer 10

1. endomysium: Around individual muscle cells
2. Perimysium: Around Cell bundles.
3. Epimysium: around whole muscle.

Question 11

What are the muscle parts from smallest to largest?

Answer 11

Myofiliment
Myofibril
Myofiber
Fascicle
Muscle

Question 12

What can Dystrophin staining show?

Answer 12

Can show the distribution of endomysin attachment.

Question 13

What are thick filaments made up of?

Answer 13

Made of myosin, with 2 heavy and light chains.

Question 14

What are thin filaments made up of?

Answer 14

Made up of actin, Troponin, Tropomyosin.

Question 15

What is the pathway of muscle contraction?

Answer 15

1. ACh released
2. Action potential travels around muscle, and into muscle via T-tubules
3. Cysternae releases Ca
4. Ca binds to Troponin, which changes confirmation of Tropomyosin.
5. Actin active site is open and allows for binding and contraction.