On about december 21 the hemisphere is tilted directly towars the sun

On about December 21 the Southern hemisphere is tilted directly towards the sun

Explanation:

On December 21st, the Southern Hemisphere is tilted towards the Sun receiving the most direct sunlight of the year during the longest day. The Northern Hemisphere is having its winter solistice, tipped away from the Sun, producing the shortest day of the year and a low Sun angle.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;