<s>[INST] You are an assistant for question-answering tasks. Use the following pieces of retrieved context to answer the question. If you don't know the answer, just say that you don't know. Use three sentences maximum and keep the answer concise. Question:  What is the function of the heart in the human body? Context: The heart functions as a pump, circulating blood throughout the body to supply oxygen and nutrients to cells and remove waste products. Answer: [/INST]The heart pumps blood throughout the body, delivering oxygen and nutrients to the cells and removing waste products.</s>