Upload
priscilla-charles
View
217
Download
0
Tags:
Embed Size (px)
Citation preview
Hook: Interesting Facts Science
There are 97,000km of blood vessels in every human
The aorta, which is largest artery located in the body, is about the diameter of a garden hose
The risk of cardiovascular disease is twice as high in women that snore regularly compared to women who do not snore
The right lung of a human is larger than the left one. This is because of the space and placement of the heart
The average life span of a single red blood cell is 120 days
The Circulatory System: Functions
The circulatory system is the transport system of the body.
Four main functions:
1. Transport of O2 and CO2.
2. Distribution of nutrients and transport of wastes.
3. Maintenance of body temperature.
4. Circulation of hormones.
The Circulatory System: Structure
There are 3 components of the circulatory system:
1. A fluid which carries materials (blood).
2. Spaces throughout the body where the fluid moves (blood vessels).
3. A pump to push fluid through spaces (heart).
The Circulatory System: Vessels
Arteries carry blood away from the heart, to the body.
Veins carry blood from the body, to the heart.
The Circulatory System: Vessels
Movement of Oxygenated Blood Through Vessels:
Large Smaller Smallest
Heart Arteries Arterioles Capillaries Tissues
Movement of Deoxygenated Blood Through Vessels:
Small Larger Largest
Tissues Capillaries Venules Veins Heart
The Circulatory System: Circuits
The circulatory system is actually two systems in one.
1.The Pulmonary Circuit
The right side of the heart pumps blood to the lungs.
The blood picks up oxygen from the lungs and returns it to the left side of the heart.
The Circulatory System: Circuits
2. The Systemic Circuit
The left side of the heart pumps oxygenated blood to the body’s system.
The blood returns to the right side of the heart without oxygen (deoxygenated).
The Circulatory System: The Heart
The mammalian heart is a double pump separated by a wall of muscle called the septum.
The heart consists of 4 chambers:
Left atrium and right atrium (upper chambers of the heart).
Left ventricle and right ventricle (lower chamber of the heart).
The Circulatory System: The Heart
The atria receive blood from the body.
The ventricles pump blood to the body.
Recall:
Pulmonary Circuit: Right ventricle pumps to the lungs; left atrium receives blood from the lungs.
Systemic Circuit: Left ventricle pumps to the body; right atrium receives blood from the body.
Blood Flow Review (Complete on work sheet)
Body Superior/Inferior Vena Cava Right Atrium Right Ventricle
Pulmonary Artery Lungs Pulmonary Vein Left Atrium Left Ventricle
Aorta Body
Blue: Deoxygenated bloodSuperior Vena Cava brings blood from the top of the body, Inferior
Vena Cava brings blood from the bottom of the body – largest vein in the body; Pulmonary Artery is the only artery in the body to
carry deoxygenated blood.Red: Oxygenated blood
The Aorta is the largest and strongest artery in the body; Pulmonary Vein is the only vein in the body to carry oxygenated blood.
No Notes - Blood Movement in the Heart
Deoxygenated blood from the body’s veins enters the right atrium of the heart.
It is then passes a valve and moves into the right ventricle.
From the right ventricle it is pumped to the lungs to receive oxygen and lose carbon dioxide
Blood Movement in the Heart
The oxygen rich blood then flows into the left atrium.
Passing another valve it moves into the left ventricle.
The blood is then pumped to the rest of the body through the aorta and into the arteries.
Oxygen is carried throughout the body.
Heart Attack
If too much cholesterol is ingested than plaque may build up
When excessive plaque builds up the artery may be clogged.
If the artery is clogged then little oxygen will move to the heart = Heart attack.
If lack of oxygen moves to the brain = Stroke
Blood Pressure
Blood pressure is the amount of pressure exerted by the heart on the blood. It varies between a maximum (systolic) and minimum (diastolic) pressure
Systolic pressure is the pressure exerted when the heart is pumping blood
Diastolic pressure is the pressure associated with the filling of the heart with blood
High and Low Blood Pressure
People with high blood pressure are said to have hypertension
People with low blood pressure are said to have hypotension