Chapter 16
Human Body Systems
The human body is a busy place! Even when you are sitting
down and reading a book, your body's organ systems are
actively carrying out their jobs. Your heart beats an average
of 70 times each minute, pumping blood to all parts of your
body. Your lungs repeatedly take in and expel air. Your skin
is constantly shedding dead cells and growing new ones. Your
digestive system is working on the last meal you ate. Even
when you sleep, your body's systems are at work. Read this
chapter to learn all about how circulation, respiration,
reproduction, digestion, and other systems work in the
human body.
- What serves as your body's internal
transportation system? - How does a developing fetus get food and oxygen
from the mother? - Is skin considered an organ?