Download The heart - circulatorysystem4E

The heart
Title:
Learning
outcomes:
The Heart
• 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.
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
There are 4 valves in the heart
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).
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.
The flow of blood around the body
• Arteries take blood
away from the heart.
• Veins take blood to the
heart.
Blood vessels
Why do they have different structures?
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.
Describe how blood circulates around
the body.
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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.
lub – dub
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.
blood pressure
Blood Pressure
Cardiac Conduction System
Types of Circulatory Systems
Watch video found at this link:
http://education-portal.com/academy/lesson/circulatory-system-i-types-of-circulatory-systems.html#lesson
Types of Circulatory Systems
Watch this video:
http://www.youtube.com/watch?v=5XqEQr-KsW8