Organ Systems

In the human body, organ systems are groups of organs that work together to perform specific functions. There are 11 major organ systems in the human body, each with its own unique set of organs and functions.

1. Circulatory System

Organs: heart, blood vessels, blood

Function: transports oxygen, nutrients, and hormones to cells; removes waste products

2. Respiratory System

Organs: nose, trachea, lungs

Function: takes in oxygen and removes carbon dioxide from the body

3. Digestive System

Organs: mouth, esophagus, stomach, intestines

Function: breaks down food and absorbs nutrients

4. Nervous System

Organs: brain, spinal cord, nerves

Function: controls and coordinates body activities; responds to internal and external stimuli

5. Skeletal System

Organs: bones, cartilage, ligaments

Function: provides support and protection for the body; allows movement

6. Muscular System

Organs: muscles, tendons

Function: enables movement; maintains posture and generates heat

7. Excretory System

Organs: kidneys, bladder, ureters, urethra

Function: removes waste products from the body

8. Integumentary System

Organs: skin, hair, nails

Function: protects the body from external damage; regulates body temperature

9. Endocrine System

Organs: pituitary gland, thyroid gland, pancreas

Function: regulates body functions through the secretion of hormones

10. Immune System

Organs: spleen, thymus, lymph nodes

Function: defends the body against pathogens and foreign substances

11. Reproductive System

Organs: ovaries, testes, uterus

Function: produces and carries offspring

Study Guide

1. What are the organs of the circulatory system and their functions?
2. Describe the function of the respiratory system.
3. List the organs of the digestive system and explain their role in the process of digestion.
4. How does the nervous system control and coordinate body activities?
5. Discuss the functions of the skeletal system and its importance in supporting the body.
6. Explain the role of the muscular system in enabling movement and maintaining posture.
7. Identify the organs of the excretory system and their function in removing waste products from the body.
8. What are the functions of the integumentary system in protecting the body?
9. Describe the role of the endocrine system in regulating body functions.
10. Discuss the function of the immune system in defending the body against pathogens.
11. Explain the reproductive system and its role in the production of offspring.

[Organ Systems] Related Worksheets and Study Guides:

• Organ systemsScience • Fourth Grade