1. Intro to Anatomy
Ch. 35-1

2. Organization of the Human Body (Review)
Cells: Basic unit of structure and function
Tissues: Group of cells that perform a single fxn
4 types: epithelial, connective, nervous, muscle
What are these tissues’ functions?
Organs: Different types of tissues that work together to perform a closely related function (e.g. eye, liver)
Organ Systems: Group of organs that perform closely related function (e.g. circulatory, respiratory, digestive)
Epithelial – glands and surface coverings (internal and external)
Connective – support for body and connects its part
Nervous – transmits impulses all over body
Muscle – connected to bone to allow movement

3. Human Organ Systems Overview
Nervous System
Structures: Brain, spinal cord, peripheral nerves
Function: Recognizes and coordinates the body’s response to changes in its internal and external environments
epithelial

4. Use pgs. 892-893 to complete these notes in your spiral notebook (due TOMORROW)
Integumentary System
Structures:
Function:
Skeletal System
Muscular System
epithelial

5. Circulatory System Structures: Function: Respiratory System
Digestive System
Excretory System
epithelial

6. Immune/Lymphatic Systems
Endocrine System
Structures:
Function:
Reproductive Systems
Immune/Lymphatic Systems
All 11 systems work together to maintain homeostasis
epithelial

7. Homeostasis
Definition: the process by which organisms keep internal conditions relatively constant despite changes in their external environments.
Requires the integration of all organ systems at the same time
Nervous system in conjunction with the endocrine system (hormones) is responsible for this integration
Homeostasis is maintained by feedback inhibition (negative feedback)
Your body’s response results in decreasing the effect of the stimulus
Ex: body temperature

8. Feedback inhibition (DRAW) Brain slows down cellular activity
Examples of Feedback Inhibition
Feedback inhibition (DRAW)
Section 35-1
Skin Temperature
Drops Below 37ºC
Sensed by
This feedback inhibits the production of chemicals that speed up cellular activity and keeps the body from getting too hot.
Brain slows down cellular activity
Brain
Cells to increase
activity
Body temp. rises
Signals