Please help! I promise to give brainiest to the person who helps!! How are the organs attached to the other body systems?

the body has levels of organisms that built on each other cells make up tissues, tissues make up organs, and organs make up organs system the function of an organs system

depends on the the integrated activity of it organs for instance digestive system organs corporate to process food

b is the best answer for this question.

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.