The diagram shows a section through a liver lobule.

Which statement about liver structure and function is correct?
Blood flows through the sinusoid WWW in the direction from VVV towards YYY and ZZZ.
Bile synthesized by hepatocytes enters WWW and is transported to the gall bladder.
Soluble proteins synthesized by hepatocytes are secreted into the blood within WWW.
Vessel ZZZ carries blood arriving directly from the small intestine.