Intro to Anatomy Ch. 35-1.

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Intro to Anatomy Ch. 35-1

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

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

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

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

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

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

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