Which of the following organ systems perform interrelated functions within the human body?
i. excretory and digestive
ii. circulatory and respiratory
iii. reproductive and endocrine
iv. skeletal and muscular

answer: i don't know

explanation:

you need to provide a picture, otherwise i can't tell you.

if you can provide one, i'd be more than happy to you with this!

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.