Body Systems Introduction and Circulatory System

Biological Structures

Biological Structure

parts within a living organism or cell

Examples:

Kidney, lung, mitochondria, chloroplast

It that makes up a living thing, or a living

thing itself

Order of Biological Structures

From Smallest to Largest

Organelle Cell Tissue Organ Organ System Organism

Order of Biological Structures

Draw a picture that helps you remember the order of Biological Structures

Order of Biological Structures Organism- a living unit/species that is completely

functional with all necessary parts

System-a group of related body parts that work

together to form a specific function

Organ- part of an organism that has a specific vital

function (ex: heart, lungs, etc.)

Tissue- specialized cells and their products forming a

certain material in the body

Cells- the smallest unit of life

Benefits of Specialized Cells

Specialized Cells-multicellular organisms have cells that can become specialized for a specific task

Example: Kidney Cells, Heart Cells, Lung Cells This allows for specialized body parts: kidneys,

heart, and lungs. Organisms with specialized cells live longer. Why do you think this is?

Benefits of having Specialized Cells

Benefits:

1. Organism has specific and unique parts

2. Species can be both male and female

3. Organism can have specific body

systems (Excretory, Digestive, etc.)

4. They tend to live longer because the cells

can focus on one task

12 Body Systems Integumentary Skeletal Lymphatic Immune Reproductive Endocrine

Circulatory Digestive Excretory Respiratory Nervous Muscular

Circulatory System Organs/Parts: Heart Blood vessels: arteries and veinso Function: Circulates blood throughout the body

Circulatory System Continued Heart- A hollow,

muscular organ that pumps blood throughout the circulatory system

http://www.youtube.com/watch?v=oE8tGkP5_tc

Circulatory System Continued Arteries:

carries blood Away from heart Oxygenated blood Carried under great pressure

Circulatory System Continued Veins: Carries de-oxygenated blood (CO2)

towards the heart Not under a lot of pressure; has valves

to work against gravity

Circulatory System Continued

Why is the artery so much thicker than the vein?

Key Ideas