The document discusses various topics related to muscle contraction including: clostridium botulinum which acts on acetylcholine receptor sites; muscle fiber gradation thresholds and maximums; isotonic contraction; wave summation; muscle fatigue caused by lactic acid buildup; Starling's law of the heart threshold; muscle warm up improving fiber gradation threshold phenomenon; and calcium, troponin, actin, and myosin roles in muscle contraction.

1. 1 2

2. 1. clostridium butolinum
ก. receptor site
ข. Ach receptor site
ค. Ach
ง.
cholinesterase
จ. cholinesterase

3. 2. gradation
ก. muscle fiber
ข. Threshold
ค.
ง. maximum
maximum
จ.

4. 3.
Isotonic contraction
ก.
ข.
ค.
ง.
จ.

5. 4.
ก.
ข.
ค.
ง.

6. 5. wave summation
ก.
ข.
ค.
ง.
จ.

7. 6. muscle fatigue
Lactic acid
C

8. 7. Starling’s law
Threshold

9. 8.

10. 9. warm up
fiber
gradation
phenomenon

11. 10.
Threshold
Ca++ Troponin
actin
Myosin
Myosin filament