Answer:
The correct answer is glands.
Explanation:
It is known that brain monitors movement, therefore, one can definitely correlate movement of muscles with the brain that comprises the role of sensory and motor neurons. When a stimulus is obtained by the sensory organs, it is transmitted by the sensory neuron to the brain and from their information is further conducted to the effector organs like muscles by the motor neuron. The glands are the group of cells, which takes part in the secretions when instigated by any particular hormone.
It would be a catalyst. They help increase the rate of chemical reactions.
Solidified, solidifying. 1. to make solid; make into a hard or compact mass; change from a liquid or gaseous to a solid form. 2. to unite firmly or consolidate.
