The Circulatory System. Miss Johnston. What is the Circulatory System?. The circulatory system pumps blood around the body. The blood contains oxygen. WRITE THIS DOWN. What is the role of the circulatory system. The role of the circulatory system is to carry materials to and from cells.
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The Circulatory System Miss Johnston
What is the Circulatory System? • The circulatory system pumps blood around the body. • The blood contains oxygen WRITE THIS DOWN
What is the role of the circulatory system • The role of the circulatory system is to carry materials to and from cells. • The many cells of our body need to be nourished with food and oxygen and have their waste products removed. • Heat is generated from our muscles and other organs and is transferred by the blood to keep us warm.
Heart Beat • Your Heart beats.. Every moment Of every day Of your life • What does a doctor use to listen to your heart? • A stethoscope
What is a pulse? • When the heart beats, it forces blood along tubes called arteries. • In some places we can feel the blood being forced along, this is called a PULSE.
Can you feel your pulse? • YOUR TURN • Where can we feel our pulse?
EXPERIMENT • Aim: To determine your resting heartbeat Work in pairs- one person counts for 30 secs using stopwatch, other person counts pulse • Try to feel the pulse in your wrist use your index and middle finger. (WHY?) • Count how many beats in a 30 seconds • How many beats in 60 seconds?
Whats your heart rate? • What is your heart rate? • Normal rates are about 60-100 beats per minute
How can we change our heart rate? • Exercise? • Run on the spot for 30 seconds • And then measure your pulse for 30 seconds • Work out your heart rate/ minute • Compare your resting heart rate with your running heart rate.
What components make up the circulatory system?? • Heart • Vein • Arteries • Capillaries
Blood Vessels Compare the three types of blood vessels
Arteries have the largest muscle layer • Veins have valves whereas arteries and capillaries don’t. • Capillaries are the thinnest and smallest and only have two layers of tissue. • How does this relates to their function?
Arteries pump blood away from the heart to the rest of the body, this is why they have the most muscle. • Capillaries are delicate networks where cells exchange materials. • Veins carry blood moving back to the heart.
The heart • Is a Muscle and Pump • It pumps blood around the body • The average adult has 5 litres of blood
The Circulation system The Lungs Blood takes up oxygen Goes to other parts of the body
Head and Arms Liver and Digestive Tract Kidneys Legs
Homework • Finish off heart model and stick in book • Label using arrows showing blood flow in the heart.