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.

  • Skin: Our body is covered by skin. Our skin protects our body and keeps us clean.

  • 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.

  • 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.
  • Intestines: Digested food goes into the intestine, then the intestine absorbs them and makes poop.  The length of the intestine is 8m.

  • Heart: Our heart pumps our blood around our whole body. Our heartbeat never stops until we die.
  • 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: