The Circulatory System Gr.10
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What is the primary function of the circulatory system?
Transports blood, oxygen, and nutrients to the body
How does the heart function in the circulatory system?
Contraction creates pressure that pushes blood through the body The heart is a muscular organ that contracts and relaxes to facilitate blood flow.
What role do valves play in the circulatory system?
Prevent blood from flowing backwards Valves are found along the blood vessels to ensure one-way flow of blood.
What is the role of the right atrium in the circulatory system?
Receives deoxygenated blood from the body through inferior and superior vena cava The right atrium is the first chamber that blood enters after returning from the body.
What does the right ventricle do?
Pumps deoxygenated blood to lungs through pulmonary artery This is essential for oxygenating the blood before it returns to the heart.
What is the function of the left atrium?
Receives oxygenated blood from lungs through pulmonary vein The left atrium is responsible for collecting blood that has been oxygenated in the lungs.
What does the left ventricle do?
Pumps oxygenated blood to body through aorta The left ventricle is the strongest chamber of the heart, responsible for distributing oxygen-rich blood.
What are the two main types of blood vessels in the circulatory system?
• Arteries: move blood away from heart • Veins: bring blood back to heart These vessels are essential for the circulation of blood throughout the body.
What are capillaries?
• Small • Thin-walled blood vessels • Bring blood close to tissues for exchange Capillaries are essential for nutrient and gas exchange in the body.
Approximately how many heart attacks occur in Canada every year?
70,000 Heart attacks are a significant health issue in Canada.
What are the main causes of heart disease?
• Hypertension • Arteriosclerosis Heart disease is one of the leading causes of death in Canada.
Define arteriosclerosis.
Thickening of the artery walls due to cholesterol or other fatty substances (called plaque) This condition can lead to serious cardiovascular issues.
What can form around plaque in arteries?
Blood clots Blood clots can lead to heart attacks or strokes.
A blood clot in the heart results in a ________.
heart attack This is a critical medical emergency.
A blood clot in the brain results in a ________.
stroke Strokes can lead to significant neurological damage.
What technique is used to widen blockages in arteries?
Angioplasty This involves inserting and inflating a balloon to open the vessel.
What type of circulatory system do insects have?
Open system In this system, blood empties into all parts of the body.
What type of circulatory system do mammals and birds have?
Closed system In this system, blood stays in arteries and veins.