5. Normal muscle contraction occurs in a series of steps, and they are as follows:
First, a motor neuron must have acetylcholine released in the synaptic cleft.
The acetylcholine is then able to bind with receptors found in the cell membrane.
This binding causes the Ca+/Na+ channels to open.
The terminal cisternae then releases calcium into the muscle fiber.
Calcium will begin to bind to troponin.
The troponin moves tropomyosin out of the way since it blocks the actin’s active site.
Next, actin uses myosin-ATPase to break down ATP to ADP and phosphate so that the myosin heads can attach to the actin.
The same myosin head will then form a bridge on the active site of the actin filament in order to
That bridge pulls in actin and pushes it over
First, a motor neuron must have acetylcholine released in the synaptic cleft.
The acetylcholine is then able to bind with receptors found in the cell membrane.
This binding causes the Ca+/Na+ channels to open.
The terminal cisternae then releases calcium into the muscle fiber.
Calcium will begin to bind to troponin.
The troponin moves tropomyosin out of the way since it blocks the actin’s active site.
Next, actin uses myosin-ATPase to break down ATP to ADP and phosphate so that the myosin heads can attach to the actin.
The same myosin head will then form a bridge on the active site of the actin filament in order to
That bridge pulls in actin and pushes it over