The force accompanying the movement of Delta into the signaling cell stretches the Notch protein on the responding cell and allowing access by ADAM 10, which cleaves the Notch extracellular domain

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#Id: 8400

#XL - Q Biochemistry

In skeletal muscle cells, 

a low cytosolic Ca+2 level is maintained by a unique Ca+2 ATPase that continually pumps Ca+2 ions from

the cytosol containing the myofibrils into the SR, establishes a reservoir of Ca+2 in the SR.

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#Id: 8399

#XL - Q Biochemistry

The structure of the sarcomere is maintained by a number of accessory proteins: 

1. CapZ 

2.Tropomodulin

3.Titin 

4.Nebulin

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#Id: 8398

#XL - Q Biochemistry

In the presence of ATP and Ca+2 , the myosin heads extending from the thick

filaments walk toward the (+) ends of the thin filaments.

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#Id: 8397

#XL - Q Biochemistry

Z disk 

Thin actin filaments are assembled with their (+) ends embedded in a densely staining structure

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#Id: 8396

#XL - Q Biochemistry

Each sarcomere contains two major types of filaments: 

Thick filaments (myosin II)

Thin filaments (actin and associated proteins)

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#Id: 8395

#XL - Q Biochemistry

Sarcomere

Within each skeletal muscle cell are many myofibrils consisting of a repeating array of a specialized structure