Please I needed pragraph

Identify the structure of the human heart which is a muscular chamber that pumps blood out of the heart and into the circulatory system.

Read this sentence. although the idea was foreign to me, i still thought i would give it a try.

Which sentence uses the denotative meaning of the word blue? i was feeling pretty blue when i lost my favorite earrings. i wore a blue scarf to complement the color of my eyes. the characters in the book all seemed rather blue. the movie’s ending always puts me in a blue mood.