1. Human body systems

2. Nervous Integumentary Respiratory Digestive Excretory Skeletal
Eleven Organ Systems
Each organ system has its own function in the body
Nervous
Integumentary
Respiratory
Digestive
Excretory
Skeletal
Muscular
Circulatory
Endocrine
Reproductive
Lymphatic/ immune

3. Nervous system Organs: Brain, Spinal cord, peripheral nerves
Function: Recognize & coordinates the body’s response to changes in its environment

4. Integumentary Organs: Skin, hair, nails, sweet & oil glands
Function: Serves as a barrier against infection & injury, helps regulate body temperature

5. Respiratory system
Organs: nose, pharynx, larynx, trachea, bronchi, bronchioles, lungs
Function: Provide oxygen & remove carbon dioxide

6. Digestive system
Organs: Mouth, pharynx, esophagus, stomach, small & large intestines, rectum
Function: Converts food into simple molecules, absorbers food, eliminates waste

7. Excretory
Organs: skin, lungs, kidneys, ureters, urinary bladder, urethra
Function: eliminates waste, toxins from the body

8. Skeletal Organs: bones, cartilage, ligaments, tendons
Function: support the body, protects internal organs, blood cell formation

9. Muscular system
Organs: skeletal muscles, smooth muscles, cardiac muscles
Function: works with skeletal system to produce voluntary movement, helps to circulate blood & move food through the digestive system

10. Circulatory Organs: Heart, blood vessels, blood
Function: bring oxygen, nutrients, and hormones to cells, fight infection, remove cell waste, regulates temperature

11. Endocrine
Organs: Hypothalamus, pituitary, thyroid, parathyroid, adrenals, pancreases, ovaries (female), testes (male)
Function: controls growth, development, and metabolism, maintains homeostasis

12. Reproductive
Organs: male - testes, epididymis, vas deferens, urethra, penis. Female – ovaries, fallopian tubes, uterus, vagina
Function: produce reproductive cells. In females nurtures & protects embryo

13. Lymphatic/ immune
Organs: white blood cells, thymus, spleen, lymph nodes, lymph vessels
Function: helps protect body from disease, collects fluid lost from blood vessels & returns it to circulatory system

14. Feedback Loops The body must self moderate – Maintain homeostasis.
Two types of feedback loops:
Negative
Positive
Negative feedback counteracts condition
Positive feedback amplifies condition
Negative more common.
Pair share: Can you think of a body function that might require a feed back loop?

15. Negative Feedback
Prevents body from moving away from a set point significantly.
Allows body to self-correct.
Ex: controlling tempurature
Negative Feedback Loop

16. Positive Feedback Accentuates disturbance. Examples:
Blood clotting
Nursing a baby causes production of milk
Closely regulated by negative feedback loops.
Positive Feedback Loop

17. Review What system is the heart a part of?
Which system is the brain a part of?
What does the excretory system do?
Name 2 sets of systems that are closely associated with each other.