Which body system makes hormones?	Endocrine
How many bones does a typical adult skeleton have?	206
Which organ pumps blood around the body?	Heart
Which organs filter waste out of the blood to make urine?	Kidneys
Which muscle under the lungs helps you breathe?	Diaphragm
What is the largest organ of the human body?	Skin
Where are most nutrients from food absorbed?	Small intestine
The brain and spinal cord make up the...	Central nervous system
Which type of muscle is found only in the heart?	Cardiac muscle
Tiny air sacs in the lungs where oxygen enters the blood:	Alveoli
Which blood cells fight infection?	White blood cells
Which blood vessels carry blood away from the heart?	Arteries
What is the main job of red bone marrow?	Making blood cells
Which organ makes bile to help digest fat?	Liver
The thymus and spleen belong to which system?	Lymphatic and immune