1. Human Body Systems
Body systems work together and depend on one another
Subtitle

2. How Is the Body Organized?
Cells
Tissues
Organs
Organ Systems

3. Cells The smallest unit of life
Individual cells in multicellular organisms tend to be specialized.
Specialized cells are uniquely suited to perform a particular function.
Bone Cell
Blood Cell
Nerve Cell

4. Tissues Come together to make
A group of cells that work together to perform a specific function in the body
ex: many muscle cells join to make up muscle tissue
Come together to make
Muscle cells

5. Organ
Two or more tissues working together to perform a specific job. Ex: brain, stomach, intestine, heart, lungs, skin, ears
In order for the heart to work, blood tissue, muscle tissue, and nerve tissues work together.

6. Organ System Skin/Integumentary Cardiovascular/Circulatory Muscular
Different organs working together to perform a particular job make up an organ system
there are 11 organ systems in the human body:
Skin/Integumentary
Cardiovascular/Circulatory
Muscular
Skeletal
Nervous
Respiratory
Digestive
Urinary
Reproductive
Lymphatic/Immune
Endocrine (hormones)
bones + cartilage
+ ligaments + joints
= Skeletal System

8. Skin, nails, & hair Integumentary System
The largest organ of the human body.
Skin covers the body & prevents water loss
Protects against injuries & infections

9. Muscular System There are about 600 muscles in the body.
Muscles work with bones for movement.
Muscles work by contracting and relaxing.
Body has three types of muscles:
Skeletal muscle
Smooth muscle
Cardiac muscle

10. Skeletal System The skeletal system Provides shape and support
Allows the body to move
Protects the internal organs
Produces blood cells

11. Cardiovascular System
The cardiovascular system
Consists of heart, blood vessels, & blood
Carries nutrients and oxygen to cells
Removes waste from the cells

12. Respiratory System The respiratory system
Moves oxygen from outside into the body
Removes carbon dioxide from the body
Nose, pharynx, trachea, bronchi, and lungs are all organs of respiratory system

13. Digestive system The digestive system
Breaks down food into nutrients (digestion)
Absorbs nutrients into blood stream (absorption)
Eliminates waste from the body
Starts at the mouth and ends at anus

15. Urinary System The urinary system
Collects liquid waste produced by the cells
Removes the waste from the body (excretion)
Filtering waste produces urine.
The two kidneys, ureters, urinary bladder, and urethra, are the organs of urinary system.
Kidney
Ureter
Bladder

16. Nervous System The nervous system
Consists of the brain, spinal cord, and neurons
Receives information about inside & outside of the body
Responds to the received information
Helps maintain homeostasis
Human body temp:
37 C (98.6 F)

17. Immune System
Immune system defends the body against pathogens (bacteria & viruses)
The cells of the immune system recognize the different kind of pathogen and destroy them.

18. Endocrine System The endocrine system
controls the body’s daily activities
Controls growth and development
Produces chemicals named hormones
Hormones order organs what to do

19. Reproductive System
The male and female reproductive system produce sex cells and sex hormones.
Female reproductive system nourishes the developing fetus and gives birth.