Muscle contraction mechanism

1.

MUSCLE CONTRACTION
MECHANISM

2.

TREE KINDS OF LEVERS
EQUILIBRIUM LEVER
FORCE LEVER
SPEED LEVER

3.

LEVERS IN ORGANISM

4.

LEVERS IN ORGANISM

5.

Joint
load
Joint
load
weight
weight
Muscle force
weight
Muscle force
Muscle force
ПРАВИЛО ВАЖЕЛЯ
Muscle force
=500N 500х3,5=50х35
Joint
load
weight

6.

Skeletal muscles

7.

SKELETAL MUSCLE STRUCTURE
FIBER
D=1мкм
D=6nм l=1мкм
actin
myosin
D=16nм l=1,5мкм
myofibril
D=10-100мкм
Sarcomere

8.

MECHANISM OF CONTRACTION

9.

Са2+ IONS

10.

SARCOMERE CONTRACTION

11.

SARCOMERE LENGTH & FORCE CORELLATION
FORCE
LENGTH
SINGLE BRIDGE

12.

DYNAMIC WORK, ISOTONIC &
AUXOTONIC CONTRACTION
ISOTONIC CONTRACTION
DYNAMIC WORK

13.

ISOTONIC CONTRACTION

14.

STATIC WORK
ISOMETRIC CONTRACTION
ISOMETRIC CONTRACTION
S = 0, A = F S = 0
STATIC WORK

15.

ISOMETRIC CONTRACTION

16.

MUSCLE CONTRACTION RATES

17.

MUSCLE ELECTROSTIMULATION

18.

MUSCLE STRUCTURE & FUNCTIONING