Human Mechanism is a Microcosmic unit of the larger Macrocosmos and there is a 1-1 correspondence between them. Watch the below video.
Let us understand why Human Mechanism is made the way it is and is a vehicle of the DIVINE Consciousness.
Mapping Consciousness and Humans
At first there was pure consciousness which is called SHI-VA (that which is not), the Universal Consciousness.
Then arose a desire to experience itself which it does by movement of MahaPrana or the Primal Energy or SHAKTI.
Similarly, the Human Mechanism is driven by Individual Consciousness or Soul. There is a desire to experience itself which is facilitated by movement of PRANA (a subset of MahaPrana).
Evolution of Human Being
By performing Yoga & Meditation Practices, we are trying to utilize and tame this Prana in the Microcosmic Unit of the human body.
This is done so that Kundalini Shakti, at the Mooladhara Chakra combines with SHI-VA at the Sahasrara Chakra. This leads to a state of SuperConsciousness.
This is what evolution of human being means which is anyway going to happen over next 2-3 million years.
By performing Yoga & Meditation, we are just speeding up this process of Human Evolution. For example, 10 years of Kriya Yoga is equivalent to 1 million years of human evolution.
So, the Divine Consciousness wants to fully experience itself through the Superconscious state of a Human Being. Human Mechanism is a vehicle of the DIVINE.