In a covalent bond, electrons are shared between atoms. In an ionic bond, electrons are transferred between atoms.

TLS Online TPP Program

#Id: 7762

#XL - Q Biochemistry

In a covalent bond, electrons are shared between atoms. In an ionic bond, electrons are transferred between atoms.

TLS Online TPP Program

#Id: 8402

#XL - Q Biochemistry

The arrival of a nerve impulse at a neuromuscular junction triggers an action potential in sarcolemma.

TLS Online TPP Program

#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.

TLS Online TPP Program

#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

TLS Online TPP Program

#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.

TLS Online TPP Program

#Id: 8397

#XL - Q Biochemistry

Z disk 

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

TLS Online TPP Program

#Id: 8396

#XL - Q Biochemistry

Each sarcomere contains two major types of filaments: 

Thick filaments (myosin II)

Thin filaments (actin and associated proteins)