Calcium ions are necessary to activate the binding sites on the actin filaments. The ATP molecule is required each time the myosin head detaches from one side and re-attaches to another.
<h3>What do you mean by actin filaments?</h3>
It is microfilaments that are responsible for cell shape and cellular movements.
The calcium ions are released when there is depolarization of the sarcomere occurs. They then bind to troponin and restructure the complex that is exposing the binding sites to the myosin head.
The cellular importance of the motor proteins is ATP-dependent which forces the impulse to actin filaments, and then the myosin head detaches from the old binding sites of actin.
Therefore, Calcium ions are necessary to activate the binding sites on the actin filaments. The ATP molecule is required each time the myosin head detaches from one side and re-attaches to another.
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Answer. A
Explanation: The medications used in the treatment of PTSD helps to alter stressful situations in people with PTSD. These medications includes:
1. Antidepressants which helps symptoms of depression and anxiety.
2. Prazosin which helps to reduce nightmares in people with PTSD
The correct answer is blood type.
The blood type of the individual in determined by the genes they inherit from their parents, it has no environmental influence.
The skin color is determined by the genes, but the main reason behind the presence of the skin color is melanin pigments. The melanin pigments present in the skin can increase to a significant level, if the exposure to sun is more. So, it is not alone determined by the genes.
The athletic ability and the muscle mass are acquired by exercising and physical training. It has a little genetic influence, it is mainly determined by the amount of exercise a person do.
A is the most sensible answer
Lubricants, Magnetic Levitation, Ball Bearing
