Body Organization

 What do you do when it is cold outside? When it is hot? ◦ Shiver or sweat  Homeostasis is the maintenance of a stable internal environment ◦ Your body systems work together to ensure that your body maintains a stable internal environment

 Body Organization ◦ Cells ◦ Tissues ◦ Organs ◦ Organ Systems ◦ Organism

 We are multicellular organisms ◦ We are made up of over 1 trillion cells  We have many different types of cells ◦ Examples: Blood cells, muscle cells, bone cells  Every cell has a specific job it carries out

 Epithelial ◦ Covers and protects underlying tissue  Nervous ◦ Sends electrical messages throughout the body  Muscle ◦ Contracts and relaxes to produce movement  Connective ◦ Joins, supports, protects, and cushions bones (joints)

 Two or more tissues working together ◦ Examples: Heart, lung, kidney, brain

 The integumentary system includes your skin, hair, nails – these protect underlying tissue

 Your muscular system works with the bones in the skeletal system to help you move  You have over 800 muscles in your body! (of the 800, about 650 just move bones)

 The skeletal system provides a frame to support and protect your body parts  The skeleton contains 206 bones and weighs about 20 lbs (you actually have over 300 bones at birth but some fuse together as you grow)

 The cardiovascular system pumps blood through all of your blood vessels

 The nervous system receives and sends electrical messages throughout the brain and body

 The lymphatic system returns leaked fluid to blood vessels and helps get rid of germs that can harm you

 The digestive system breaks down food into nutrients that can be absorbed by the body

 The endocrine system contains glands that regulate body functions by sending out chemical signals (aka hormones)

 The respiratory system allows the body to absorb oxygen and release carbon dioxide

 The urinary system effectively removes wastes from the blood and regulates fluids

 Male ◦ The male reproductive system produces and delivers sperm  Female ◦ The female reproductive system produces eggs and can hold unborn babies

 You will be creating a Human Body Booklet  In order to find the information to fill this booklet you will be using textbooks and the literacy library books along with activities associated with each system  You and your desk partner will be working together on the same system at the same time

 You will have 5 days to complete your booklets (you will need to average 2 systems per class period)  This will count as a grade and your study guide for your human body quiz