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The Cardiovascular System

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by

Robert Williford

on 7 May 2014

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Transcript of The Cardiovascular System

The cardiovascular system transports materials to and from your cells. Cardio means "heart" and vascular means "vessel". This system consists of the heart, blood, and blood vessels.
The Cardiovascular System
Blood
is a connective tissue made of two parts: cell parts and plasma.
Plasma
- the liquid part of blood that is made of water, minerals, nutrients, sugars, proteins, and other substances.
Cell parts -
red blood cells, white blood cells, and platelets.

Red blood cells - the job of each red blood cell is to carry oxygen to the rest of the body. Each red blood cell contains hemoglobin which clings to oxygen molecules.

White blood cells - these protect us from harmful pathogens. They can release antibodies which are chemicals specifically designed to kill different viruses and bacteria.

Platelets - pieces of cells created in the bone marrow that are designed to clog any openings in blood vessels.
What is Blood?
Heart -
a muscular organ that pumps oxygen poor blood to the lungs and oxygen rich blood to the rest of the body. It consists of four chambers. The two top chambers are called atria and the two bottom chambers are called ventricles.
Have a Heart
Arteries -
blood vessels that direct blood away from the heart. Arteries have thick elastic walls to handle the high pressure from the heart pumping blood directly through them.

Capillaries -
the smallest blood vessels in the body. One hair is ten times wider than a capillary. These for blood cells to pass single file through the blood vessel.

Veins -
after leaving capillaries blood enters veins to be directed back to the heart.
Blood Vessels
Pulmonary circulation -
the circulation of blood between your heart and lungs.

Systemic circulation -
the circulation of blood between the heart and the rest of the body.
The Flow of Blood Through the Body
blood pressure -
the force exerted by blood on the inside walls of a blood vessel.
Blood Flows Under Pressure
Cardiovascular problems
Blood Type - your red blood cells have certain chemicals, called antigens, on the surface of them and the liquid part of your blood contains antibodies which attack certain types of blood cells. This is why you can only be given certain types of blood and have your body accept it.
Causes - smoking, high levels of cholesterol in blood, stress, heredity, and other factors.
Atherosclerosis -
when fatty materials, such as cholesterol, build up on the inside of blood vessels.This is the leading cause of death in the United States.

Hypertension -
abnormally high blood pressure caused by atherosclerosis. Dangerously high blood pressure causes the heart to work harder which puts to much pressure on blood vessels putting them a risk for rupturing. If a blood vessel in the brain becomes clogged or ruptures parts of the brain wont get oxygen so they die. This is called a
stroke.
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