Rafiki Network Program
Introduction and Human Systems
Human Systems
Our bodies work a little differently for boys and girls.
Human system: muscle, skin, skeleton, body organs, cells, blood cells,
- Muscle: Our brains tell our muscles to move, and our muscles move our arms.
- Skeleton: Bones support us to stand, sit down, dance…everything. You are getting taller because your bones are becoming longer.
- Body organs: We have organs inside our bodies. (ex. Brain, lungs, stomach, intestines, heart, liver, bladders, kidneys) Each organ is made up of tissue. Tissue can be both hard or soft (ex. soft tissue: skin, hard tissue: bones) All tissue is made of millions of cells. Cells are the smallest piece of us.
- Cells: Cells contain DNA. There are 3 characters in our blood, Red Blood Cells(RBCs), White Blood Cells(WBCs), and platelets. RBCs carry oxygen from the lungs around the body. WBCs defend the body. Platelets help stop bleeding.
- Brain: The brain is an important organ to move our body or to think. It enables us to feel hot, cold, hard, soft, painful, happy, and sad.
- Lungs: Lungs are important for breathing.
- Stomach: The stomach stores food, digests it, and gradually sends it to the intestines.
- Intestines: Digested food goes into the intestine, then the intestine absorbs them and makes poop. The length of the intestine is 8m.
- Liver: Our liver is another really big, and really important organ. The liver gives us power from our food and keeps our bodies clean inside.
- Bladder: The urinary bladder holds up to about 500 milliliters of pee. You start to feel like peeing when it collects from 100 to 300 milliliters of urine.
- Kidneys: The urine (pee) comes from the kidneys. Kidneys make pee and they are connected to the urinary bladder through the tubes which are called ureters. After pee comes to the bladder, we pee into the toilet through another tube which is called the urethra. Our kidneys make urine to remove waste from our body system.
Urine (pee) Route: