Cross Bridge Formation

What will be an ideal response?


A) Calcium ion binds to troponin
B) Tropomyosin moves away revealing active site
C) Myosin head MUST BE ACTIVATED BEFORE - This occurs when ATP binds to the myosin head and is hydrolyzed to ADP and inorganic phosphate. The energy liberated from the hydrolysis of ATP activates the myosin head, forcing it into the cocked position.
In general 4 steps:
1- Cross Bridge Formation - activated myosin binds to actin forming a cross bridge
2- Power Stroke - ADP is released and the activated myosin head pivots, sliding the thin myofilament toward the center of the sarcomere
3- Cross Bridge Detachment - ATP binds to the myosin head weakening the bond with the active site and it detaches
4- Reactivaton - see step #3
This continues as long as the calcium binds to troponin, moving tropomyosin away from the active site.

Anatomy & Physiology

You might also like to view...

The structural classification of joints is based on the composition of the binding material and the presence or absence of a joint cavity

Indicate whether the statement is true or false

Anatomy & Physiology

Arteriosclerosis is one example of ectopic ossification, which means ________.

A. abnormal calcification of a tissue B. accumulation of collagenous fibers in blood vessels C. artery mineralization by osteoblasts D. ossification of an entire blood vessel E. the solubility product has been reached

Anatomy & Physiology

The pubic symphysis can be palpated as a hard prominence above the genitalia

Indicate whether the statement is true or false

Anatomy & Physiology

The nervous system exerts considerable control over the endocrine system, but hormones have no influence over the nervous system

Indicate whether the statement is true or false

Anatomy & Physiology