Myology Flashcards Preview

Myology Muscle Physiology > Myology > Flashcards

Flashcards in Myology Deck (23)
Loading flashcards...
0

Non-striated (smooth muscle)

Short, spindle -shaped cells
Involuntary muscle-no control
Cells can divide
Found in organs

1

Striated cardiac muscle

Stacked end to end
Involuntary muscle
Found in the heart
Too specialized to divide

2

Striated skeletal muscle

One multinucleated cell
Voluntary muscle
Cannot repair itself

3

Function of muscle tissue

Movement
Support and maintain posture
Heat production

4

Muscle belly

Vascular, reddish or meat-like appearance,
Lots of blood and cells,

5

Tendons

Avascular, tough, white, college fibers muscle to bone

6

Attachments

Origin-fixed end: least mobile during muscle contraction. Closer to midline
Shoulder

Insertion- mobile end: more movement during muscle contraction, further from the midline

7

Muscle cells myofibril

Striated skeletal myocyte- muscle cell or fiber

8

Endomysium

Loose connective tissue
Wrapping around Twinkie

9

Perimysium

Dense irregular connective tissue
Box

10

Epimysium

Dense irregular connective tissue
Crate

11

Facia

Dense irregular connective tissue
Big strong wrapping paper

12

The predominant structural feature of the muscle fiber is the presence of numerous ______

Myofibrils

13

Thick filament

Molecular motors
Myosin

14

Thin filament

Binding sites
Actin

15

Troponin-tropomyosin complex

Door. Wraps around thin

16

Sarcomere

Contraction between to z discs

17

Contraction

Thin gets pulled in together

18

Motor unit

Motor neuron and muscle cell

19

Motor neurons tell..

Muscle when to release calcium, which will loosen the tt- complex which then the thick can attach to the thin

20

Mechanics of muscle contraction (4)

1. Relaxed state- thick is not attached to thin receptor cites are blocked
2. Attachment- calcium enters tt- complex loosens myosin (thick) attaches
3. Power stroke- bind and pull moves thin closer together
4. Release and reset- ATP is released to reset myosin, tt-c binds back around thin myosin(thick) cannot attach

21

Without binding there is....

No movement

22

When ATP comes in ....

Calcium goes out