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The Heart & its Functions

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taylor pedersen

on 14 January 2014

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Transcript of The Heart & its Functions

The Heart & its Functions

-Song: The Heart Song By: ParrMr
-Heart and its Functions Note
-Heart Diagram: Fill in the Blank Note
-Medical Conditions & Technology
-Medical Role Play Activity
-Student Review

By: Nicole and Taylor

Function of the Heart
The heart is a large muscle that is roughly the same size as your clenched fist, and is located between your lungs.

The heart is made to pump oxygen-poor blood to your lungs and oxygen-rich blood to your entire body.

When your heart contracts, blood is pumped out.
4 Chambers of the Heart
4 Chambers Continued
The right and left atrium take in the returning blood and pump it to the left and right ventricles, which then pump the blood out of the aorta back throughout the body.
Security System of the Heart
The atrioventricular valves, located between the atria and ventricles, prevent blood from flowing back into the heart and mixing oxygenated and oxygen-poor blood.

The pulmonary valve is located by the right ventricle and the pulmonary artery.
The aortic valve is located by the left ventricle and the aorta.
The Tricuspid valve is located on the right side of the heart. It is the also the gatekeeper for oxygen-rich and poor blood.
The Mitral valve is located on the left side of the heart. It is the gatekeeper for oxygen-rich and poor blood.
"Lub Dubbiness"
With each heartbeat your valves close to prevent blood from flowing backwards.
The sound comes from the opening and closing of those valves.

"Lub Dubbiness"
The "lub" sound is when your atrioventricular valves closing.
The "dub" sound is when your pulmonary and aortic valves close.
2 Circuits of Blood Flow
1) Pulmonary Circuit- the circuit where blood travels from the right side of the heart through the lungs to pick up oxygen and release carbon dioxide, then travels to the left side of the heart through the pulmonary veins.
2 Circuits of
Blood Flow
2) Systemic circuit- circuit where oxygen-rich blood from the lungs gathers in the left atrium and is then pumped to the left ventricle and through the aorta to all of the systems to the body.
Vena (veins) + Cava (hollow) = Vena Cava
Superior Vena Cava- veins entering the heart from the upper body.

Inferior Vena Cava- veins entering the heart from the lower body.

After the blood is replenished with oxygen in the lungs, blood is returned to the heart through the pulmonary veins and left atruim.
Vena Cava
Blood Supply for the
Coronary- means crowned, in Latin

Coronary Arteries- cover the surface of the heart like a crown and supply the heart muscle with the necessary nutrients.
The Heartbeat
Don't puppies make your heartbeat faster?
Heartbeat Regulation
The average teenager's heart beats over 100 000 times everyday!!
The heart rate of each individual is affected by their age, fitness, and emotions.
The region of your heart, known as the pacemaker, sets the rate at which your heart contracts.
Sometimes the natural pacemaker in your heart doesn't work or stops working. Doctors have made an artificial pacemaker that is surgically put in and this acts as the natural one, regulating your heartbeat.
Chemical Balance
The pacemaker ensures that the heart beats in a rhythmic cycle.
The atria contract, and blood is forced into the ventricles, which are relaxed.
Then the ventricles contract, pumping blood into arteries, while the atria are relaxed.
This cycle repeats about every second when you are resting.
Please do not laugh
...feel free to sing along....
-Song: The Heart Song By: ParrMr
-Heart and its Functions Fill in the Blank Note
-Quick Review
-Medical Conditions & Technology
-Medical Role Play Activity
-Student Review
Blood flowing through body.
The pacemaker is controlled by both the nervous system and the endocrine system (makes hormones).
2 sets of opposing nerves control the pacemaker by speeding it up or slowing down.
Hormones are secreted into the blood and also control the pacemaker.
Ex: The hormone epinephrine, also called adrenaline, increases the heart rate when the body is under stress.
Blood pressure can be measured using a press cuff, called a sphygmomanometer.
Blood Pressure
An inflatable cuff called a sphygmomanometer is wrapped around a person's arm. As air is pumped in, the cuff squeezes the arm and closes a large artery. As air is slowly released from the cuff, a stethoscope is used to detect the sound of blood flowing through the artery.
Measuring Blood Pressure
1) Systolic pressure- the highest recorded pressure in an artery when the ventricles contract.
2) Diastolic pressure- the lowest recorded pressure in an artery during the relaxation phase of the heart beat.
Blood Pressure
Blood pressure depends on 2 factors:
1) Cardiac Output- the amount of blood pumped by the heart each minute
2) Arterial Resistance- the elasticity in the arteries (expand instead of resisting flow). The pressure of the blood on the arterial walls increases.

Healthy blood pressure in a young adult varies between 120/80. A blood pressure consistently above 140/90 is considered high.
1) The function of the pacemaker is __________
2) A blood pressure cuff is called a ____________
3) ___________ pressure is the highest recorded blood pressure in an artery and ____________ pressure is the lowest recorded blood pressure.

1) The 2 circuits of blood flow are: _________ & ____________
2) Why does the heart make a "lub dub" sound?
3) __________ vena cava- veins entering the heart from the upper body. ____________ vena cava- veins entering the heart from the lower body.
Valves in the Heart
Chambers of the Heart
Heart Disease
High Blood Pressure
A chronic medical conditions in which the blood pressure is elevated. It is also referred to as high blood pressure or shortened to ht. The word hypertension normally refers to systemic, arterial hypertension.
The term for a variety of different diseases affecting the heart. As of 2007, it is the leading cause of death in the United States, England, Canada and Whales.

Fact- Heart diseases kill one person every 34 seconds in the United States alone!

A condition where the heart beats with an irregular or abnormal rhythm because of abnormal pacemaker beats.
A sudden disabling attack or loss of consciousness caused by an interruption in the flow of blood through the brain.
Heart Attack
A sudden and sometimes fatal occurrence of coronary thrombosis, typically resulting in the death of part of a heart muscle.
An Example of Heart Defects
A close friend of ours was born with a heart defect called Critical Aortic Stenosis. He was put on life support, intebated, sedated, and medicated.

He was on the transplant waiting list for a new heart at 5 days old.
When he was 22 days old he was given a new heart. This was a great miracle and Owen is now a happy, healthy 7 year old boy, thanks to SickKids Hospital.

Due to the heavy medications he received as an infant, Owen is hard of hearing in both ears and because of this he is a little behind in his speech. Thanks to new technology, he received hearing aids at the age of 1 and a half.

He calls his hearing aids his Magic Ears. He goes to a program called Echo at SickKids for his hearing and speech. His parents decided to have a Cocular Implant surgically implanted in his brain to allow him to clearly hear and progress faster in school.
Thanks to the new medical technologies there are new ways to face life through tough circumstances.
SickKids plays a huge part in many peoples lives and helps make situations like these easier by providing housing for many families through the Ronald McDonald House Charities.

Owens family is very grateful for the support they received in their time of need.
Be a Hero, Be a Donor
Thanks to Owens donor family, he is happy, healthy and progressing well in school.

1 organ donor can save up to 8 lives. You can make a HUGE difference in someones life by taking 2 minutes to sign up to be a donor.
This is Owen
The End
Any questions?
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