The human body
Body systems work together: the circulatory system carries oxygen, the digestive system extracts nutrients and the urinary system filters the blood.
About: The human body
Body systems work together: the circulatory system carries oxygen, the digestive system extracts nutrients and the urinary system filters the blood.
Worked examples
Which organ pumps blood through the body?
Answer: Heart. The heart is a muscle that beats about 60 to 100 times per minute at rest.
What is the main job of red blood cells?
Answer: Carry oxygen. Hemoglobin in red cells binds oxygen in the lungs and delivers it to tissues.
Where are most nutrients absorbed?
Answer: Small intestine. The villi of the small intestine greatly increase the absorbing surface.