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The heart.

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Presentation on theme: "The heart."— Presentation transcript:

1 The heart

2 Title: The Heart Learning outcomes: Describe the role of the heart in the circulatory system. Explain the differences between arteries, veins and capillaries, by relating their structure to their function. Explain the role of coronary arteries. Describe what is coronary heart disease.

3 Keywords for the heart Atrium (ae-tree-um) – the first chamber into which blood enters. Ventricle (ven-trik-al)– the lower chambers of the heart. Blood is pumped from these. Arteries – Blood vessels that take blood away from the heart. Veins – Blood vessels that bring blood back to the heart. Capillaries – the smallest blood vessels. Where Oxygen and nutrients leave the blood and Coronary arteries – arteries that wrap around the heart


5 There are 4 valves in the heart

6 Double circulatory system
A double circulatory system separates the oxygenated and the deoxygenated blood. The pulmonary circuit pumps blood to the lungs. The systemic circuit pumps blood to the body systems (i.e. The head, limbs, and trunk).

7 Double circulatory system
The right ventricle pumps blood through the shorter pulmonary circuit. The left ventricle pumps blood through the longer systemic circuit. As a result, the left ventricle’s walls are thicker and stronger.

8 The flow of blood around the body
Arteries take blood away from the heart. Veins take blood to the heart.

9 Blood vessels

10 Why do they have different structures?

11 Coronary Arteries The heart is made of muscle cells.
Just like other cells in the body, these heart cells need a supply of oxygen and nutrients. Coronary arteries deliver blood containing oxygen and nutrients to the heart.

12 Describe how blood circulates around the body.
Heart pumps Cardiac muscle contracts Ventricles fill Blood forced out under pressure LHS of heart stronger Oxygenated blood pumped to organs of the body from LHS RHS pumps deoxygenated blood to the lungs Blood under pressure from the heart passes through arteries Blood returning to the heart flows through veins Blood moves from arteries to veins through capillaries.

13 lub – dub

14 cardiac cycle The cardiac cycle is the sequence of events that occurs when the heart beats. There are two phases: diastole and systole In the diastole phase, the heart ventricles are relaxed and fill with blood. In the systole phase, the ventricles contract and pump blood to the arteries.

15 blood pressure

16 Blood Pressure

17 Cardiac Conduction System

18 Types of Circulatory Systems
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19 Types of Circulatory Systems
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