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1.4d Circulatory System

Transport substances around the bodyo Carries nutrients from the intestines to cellso carries oxygen from the lungs to cellso carries carbon dioxide from cells to the lungso carries waste from body tissues to kidneys to be filtered

3 necessary components:o Blood o Heart o Blood vessels

Blood:

Cell Function

Red Blood Cells transports oxygen throughout the body

White Blood Cells Fight infections by destroying invading bacteria/viruses

Platelets

Assist in blood clotting

Plasma Protein-rich liquid that carries the blood

Heart Three different types of tissue

o muscle tissue

o Nerve tissue

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o Connective tissue

Blood Vessels tubes that transport blood throughout body

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Vessel Function Example

ArteryCarry blood AWAY from the heart

Aorta

VeinCarry blood BACK TO the heart

Superior/inferior vena cava

Capillary-Narrow vessels, one cell thick-Location of Gas exchange-Bridge between arteries and veins

Nervous SystemCENTRAL NERVOUS SYSTEM

Consists of the brain and the spinal cord

PERIPHERAL NERVOUS SYSTEM

Neurons with long extensions connect the central nervous system to the rest of the body

FUNCTION

messages are carried from:o One area of the brain to anothero The brain to body tissueso Body tissues to the brain

Unit 3: Biology Date:______________________

NEURONS

Cary electrical impulses throughout the body DO NOT go through cell division