Myology And Muscle Physiology

Question 0

Which 1 the 3 muscles are voluntary?

where are all 3 muscles found?

Answer 0

1. ) Smooth muscle- found in visceral organs throughout the body.
   - involuntary
   - Cells can divide and regenerate
2. ) Striated Cardiac muscle- found in wall of the heart.
   - Involuntary
3. ) Striated skeletal muscle- form the powerful contracting muscles of that musculoskeletal system. (Found were bones are)
   - Voluntary
   - Cannot repair self

Question 1

What are 3 types of muscle tissues?

Answer 1

1. Non-striated muscle (known as smooth muscle)
2. Striated Cardiac muscle
3. Striated skeletal muscle

Question 2

What are the 3 functions of muscle tissue?

Answer 2

• produces movement
• supports and maintains posture
• heat production

Question 3

what are the 2 different macro muscles of the body?

What are their functions?

Answer 3

1. ) Muscle belly- the body of the muscle( Vascular)
   - has lots of cells
2. ) Tendons- attaches the muscle belly to the bone (Avascular)
   - has collagen fibers

Question 4

What are the names of the 2 attachments and where are they located?

Answer 4

1. ) Origin- Fixed end
   - Least mobile
   - closest to the midline
2. ) Insertion- Mobile end
   - Most movement
   - Further from midline

Question 5

What are the 5 different names of the Microanatomy of the muscle?

Answer 5

1. ) Muscle cell / Myofibril
2. ) Endomysium
3. ) Perimysium
4. ) Epimysium
5. ) Fascia

Question 6

What are the functions of the 5 microanatomy muscles?

Answer 6

1. ) Muscle cell /myofibril- the middle (the Twinkie)
2. ) Endomysium- first wrapping around the cell (rapper around the Twinkie)
3. ) Perimysium-the protective case (the box around the Twinkies)
4. ) Epimysium- outer wrapping around the bundles(the crate Twinkie boxes are in)
5. ) Fascia- the envelope that wraps around the region of muscles. (The wrapping around the crate of the Twinkies)

Question 7

What are the 3 microstructures of the muscle fiber?

What are their function?

Answer 7

1. ) thick filament- molecular motors, myosin molecules, myosin tail and myosin head
2. ) thin filament- binding sites for molecular motors, actin molecules, molecular binding sites
3. ) Troponin-Tropmyosin complex- wraps around the thin filament

Question 8

What is sarcomere?

Answer 8

The basic function unit of that contractile system within striated muscle tissue.
It is defined by the region between the two z-discs.

Question 9

Neuromuscular junction and the motor unit

Answer 9

Motor unit:

Motor neuron
        \+
Muscle cell
     (Cell)
     ~>
Release of calcium 
        ~>
Release of TT complex
Movement 
         ~>
ATP= Reset
(ATP flushes out calcium)