According to Sigmund Freud, human personality is complex and has more than a single component. In his famous psychoanalytic theory of personality, personality is composed of three elements. These three elements of personality—known as the id, the ego, and the superego—work together to create complex human behaviors.
Each component not only adds its own unique contribution to personality, but all three elements interact in ways that have a powerful influence on each individual. Each of these three elements of personality emerges at different points in life.
The correct answer is: contractile vacuoles.
Paramecium is simple unicellular ciliate that lives in the water environments. It is often used as model organism in laboratory experiments because of its ability to easy conjugate and divide.
Osmoregulation of the paramecium is regulated by contractile vacuoles (one or more within the cell). Contractile vacuoles expel water from the cell in order to compensate for fluid absorbed by osmosis from its water surroundings.
Motor end plates are associated with muscle contraction definitely, and I would say also <em>neuron transmitter, </em>although I'm not sure about that one.
