The Circulatory System

May 18, 2012pgs. 151-152

KnowWhat do you know about the circulatory System?

Evidence: Drawings pg 539 and 541 textbook– draw, label and color

“I don’t know anything.” is not an acceptable answer.Use complete sentences.

Functions

Clarifying ?s Information

Ex: Vitamins, minerals, nutrients, oxygen

Ex: carbon dioxide, ammonia, lactic acid

1. Transports/delivers necessary materials to muscles and organs

2. Eliminates waste

Circulatory System

3. Carries red/white blood cells through body; White blood cells help fight infections and red blood cells store oxygen.

The heart Hollow organ made mostly of muscle that pumps blood through the body. About the size of your fist. Blood flows only go one direction through heart.

Heart Structure Has four hollow cavities– chambers-- divided into the two upper chambers--atria and two lower chambers-- ventricles.

They are divided into left and right sides. Two sides are not connected; separated by a wall of muscle. The ventricles are connected by passageways to the atria.

passageways blocked by one way valves, which allow blood to only flow from the atria to the ventricles.

How the heart works

Clarifying ?s Information

Heart and circulatory system is a closed repeating pathway,

Phase 1:. Right ventricle pumps oxygen depleted blood to lungs. Left ventricle pumps oxygen enriched blood to head and body.

Circulatory System

Phase 2: Right atrium receives oxygen depleted blood from head and body. Left atrium receives oxygen enriched blood from lungs.

FYI: Warm blooded vertebrates (Birds/mammals) have four chambered hearts. Cold blooded vertebrates (except crocodilians) have three chambered hearts.

Then it all starts over again, and again, and again, and again …….

Clarifying ?s Information

- regulates the heart beating . Placed in the right atrium, to control heart rate.

Circulatory System

Arteries

- tiny vessels substances are exchanged between the blood and body cells

- blood vessels that carry blood away from the heart. Blood is under greater pressure, bright red.

Pacemaker

Capillaries

Veins - blood vessels that carry blood toward the heart. There is less pressure bluish because of carbon-dioxide content.

Pulse - Anywhere the arteries pass close to the skin, there is a pulse, you feel the heart beat.

Examples: wrist, neck, temple, behind the knees

Clarifying ?s InformationCirculatory System

1. passes through kidneys, wastes filtered out of blood

2. flows through liver, toxins (medicine, alcohol, chemicals) are filtered out of the blood.

3. flows through organs, muscles and other body parts, nutrients/oxygen delivered, wastes are picked up.

4. flows through the lungs, carbon dioxide is left, oxygen absorbed.

Blood flows from the heart to the aorta (body’s biggest artery), to smaller arteries, then to tiny capillaries.

From capillaries, the blood goes through small veins, then the largest vein- the superior vena-cava, back into heart.

Summary:

What does blood do?

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