Human Body Systems An Introduction Remember the human

Human Body Systems An Introduction

• Remember, the human body is organized in several levels, from the simplest to the most complex. . . • Cells – the basic unit of life • Tissues – clusters of similar cells performing a similar function. Contains all one type of cell • Organs – made of tissues that perform one specific function. Contains different types of cells • Organ Systems – groups of organs that perform a specific purpose in the human body • ***The purpose of the 11 organ systems is for the human body to maintain homeostasis.

Digestive System • Purpose: to break down food particles into smaller micromolecules that can be absorbed into the bloodstream and used by the cells of the body.

Excretory System • Purpose: to rid the body of wastes, including excess water and salts

Respiratory System • Purpose: to provide the body with a fresh supply of oxygen for cellular respiration and remove the waste product carbon dioxide

Circulatory System • Purpose: to deliver oxygen, food, and other molecules to the various cells. Removes waste products, like CO 2, from cells. Circulates materials around the body

Nervous System • Purpose: to coordinate the body’s response to changes in its internal and external environment

Sensory Nerves allow us to feel; hot, cold, pressure, pain. Motor Nerves allow us to move muscles

Endocrine System • Purpose: to control growth, development, metabolism and reproduction through the production and secretion of hormones

Skeletal System • Purpose: to provide structure and support to the human body • Bones are where new blood cells are made (in the bone marrow)

Muscular System • Purpose: works with the skeletal and nervous system to produce movement, also helps to circulate blood through the human body

Immune (& Lymphatic) System • Purpose: to destroy and remove infectious diseases ( bacteria and viruses) from the human body

Integumentary System • Purpose: to act as a barrier to protect the body from the outside world. It also keeps the body from dehydrating, protects against disease and helps regulate body temperature. • The main organs of this system consists of the skin, hair, nails & glands

Reproductive System • The Reproductive System: Allows organisms to reproduce and pass their characteristics on to offspring