Which of the following is a main function of the circulatory system? A.
To break down nutrients into a simpler form
B.
To transport oxygen to tissues throughout the body
C.
To send signals to the nervous system
D.
To produce hormones for reproduction

What is the significance of the protein-lined pits? a. protein attracts other proteins needed for atp synthesis within the cell. b. protein-lined pits are able to transport one molecule at a time down the concentration gradient within the cell. c. the polarity of proteins allows other polar molecules to attach and be transported in the cell by transport channels. d. receptors within the pits allow ligands to fuse and be transported into the cell by endocytosis.