1. Human Body
Chapter 27

2. 27.1 Structure & Function Anatomy= study of the structure
Physiology = the study of the function
Knowing the structure allows understanding of function

3. Levels of Body Structure
Cell= single unit
Tissue= many similar cells working together to perform a similar function
Organ= several tissues that together perform a task
Organ System= multiple organs performing a vital function
Organism

4. http://68. 90. 81. 6/ScienceTAKS/Integration/Major%20Organ%20Systems

5. 27.2 Tissues
Cells make up various types of tissues based on function

6. Epithelial Sheets of tightly packed cells
Line the surface of body and internal organs
Protect organs and tissues they cover Many types
Ciliated – catch mucus
Smooth
Thin/Flat

7. Connective Tissue Holds tissues together Provides support
Cushions, insulates and connects organs
Most common type = loose
Ex: Bone, cartilage, blood & fat

8. Nervous Communication system for the organisms
Neuron = basic unit (nerve cell)
Transmits signals over long distances

10. Muscle Enables movement Aids in digestion and circulation Composed of:
Connective, nervous, and muscle tissues
3 Types:
Skeletal- under your control
Attached to bones
Involuntary- not under your control
Cardiac
Smooth = involuntary in most other organs
Ex: Move food in intestine

12. HWK
System
Major structures
Functions
Circulatory
Digestive
Nervous