The Circulatory SystemLet’s get moving on….

Your Transportation System!!

Transportation Blood transports materials throughout the body

Oxygen -from lungs/respiratory system to the body cells

Nutrients -from intestines/digestive system to body cells

Heat -waste from cellular respiration to skin/integumentary for release

Waste- like CO2 from cells to the lungs/respiratory system for expulsion and toxins/urea to kidneys to be filtered out

Major Organs of the Circulatory System

Heart: cardiac muscle that pumps blood; heart rate controlled by brain

There are four chambers in the heart:2 upper atria (atrium) that receive blood2 lower ventricles that pump blood

So….about how many times does your heart beat??

A minute = 60-80An hour = 4000A day = 100,000A year = 37,000,000A life time (70 years ) = 2,500,000,000

Blood vessels• Vascular tissue: veins/arteries/capillaries-the

“tubes” or vessels through which the blood flows

• Veins- carry oxygen depleted blood TO the heart

• Arteries- carry oxygen rich blood AWAY from the heart the all the cells in the body

• Capillaries-very thin vessels where materials are transferred from cells into and out of the bloodstream usually through diffusion

• There are about 60,000 miles of blood vessels in your body…enough blood vessels to stretch around the equator 2.5 times!!

Capillaries• The smallest blood vessels in the

body• Links between arteries and veins• Capillaries deliver oxygen and

nutrients (digested food) to every cell in the body and remove the carbon dioxide and other wastes.

Blood ComponentsRed Blood Cell: contain a protein

hemoglobin that binds with oxygen and carries it to cells in the body

White Blood Cells: leukocytes- fight pathogens (disease causing substances) in the body, different types do different jobs, produce antibodies which are proteins that recognize and attack specific pathogens

Platelets: small pieces of cytoplasm that adhere to broken blood vessels and tissues to form a plug to stop bleeding; help clot the blood

Plasma: liquid portion of the bloodPlasma is 90% water

The heart and lung connection…….

• Blood is pumped from the heart to the ___________

• In the lungs, the ____________________ pick up oxygen from the ______________(lungs)

• The OXYGENATED blood returns to the HEART.

• The oxygenated blood is pumped to the __________ of the body

RED BLOOD CELLS

LUNGS

ALVEOLI

CELLS

• The cells use the oxygen to carry out ________________________

• The waste product of cellular respiration is _____________________

• CO2 diffuses out of the CELLS and into the BLOODSTREAM.

CELLULAR RESPIRATION

CARBON DIOXIDE

The blood is pumped to the heart, from the heart to the lungs, and from the lungs CO2 is expelled from the body. While in the lungs, the blood cells pick up oxygen and start all over again!!!

Pathway of Blood through the Heart

1. Oxygen depleted blood from the body enters the right atrium (superior and inferior vena cava)

2. Blood flows into the right ventricle

3. Blood is pumped from the right ventricle to the lungs to drop off CO2 and pick up oxygen(pulmonary artery)

4. Oxygen rich blood returns to the heart through the left atrium (pulmonary vein)5. Blood flows into the left ventricle6. Oxygen rich blood is pumped from the left ventricle through the aorta and out to the body

The Pathway of Blood Through the Heart

Valves: structures in the heart and veins that open and close to prevent blood from flowing backwards

Heart Valves

Vein Valves

Let’s keep the blood flowing…..

Circulatory System fun….