Motor Physiology Flashcards Preview

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Flashcards in Motor Physiology Deck (12):
0

Tethers myosin to Z lines (scaffholding), binds Z lines to M line

Titin

1

Stabilizes sarcolemme & prevents contraction-induced rupture

Dystrophin

2

Binds actin to Z lines

Actinin, Cap2 protein

3

Binds Z lines to sarcolemma

Desmin

4

Act as a molecular ruler that sets the length of actin during assembly

Nebulin

5

What is the distance achieved in each cross-bridge cycle?

10 nanometers

6

Small motor units are recruited first before big motor units

Size principle

7

Multiple fiber summation

Spatial summation

8

Frequency summation

Temporal summation

9

Each contraction occurs after complete relaxation producing stronger contraction each time

Staircase (Treppe) effect

10

Basis for treppe effect

Ca2 accumulation, pH changes, increased temperature

11

Complete fusion of individual muscle contraction when Ca is all used up

Tetany