Each member of the governing board of any park district before entering upon the duties of each such member's office shall take and subscribe an oath to well and faithfully discharge the member's duties, which oath shall be filed with the secretary of the board. The members of such governing board shall constitute the corporate authority for such district and a majority of such members shall constitute a quorum for said board and any meeting thereof. The members of such governing board shall act as such without compensation, and each member of the board shall be a legal voter of and reside within such district.