1. explain how sunlight is the primary source of enerav for vour own life

The sun provides the energy for plants which starts the whole food chain.

Explanation:

The human body has to remain a certain temperature. The sun provides that heat. I have to drink. The sun evaporates water so it can be redistributed in the form of rain. Your life is set by the movement of the sun.

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.