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There’s the cardiac muscle, which is very special. Other muscles have cramps
when it’s worn out or have anaerobic respiration (doesn't have enough oxygen).
1) The structure of the heart: the position of the two atriums (left and right)
and two ventricles (left and right). The septum (separating the heart in
two halves) on the diagram as well. 4 major arteries and veins coming
from the heart.
Atriums are larger than ventricles. A valve is something that allows fluids
to move in just one way.
2) A diagram of the circulation path around the human body showing the
pulmonary circuit. One loop goes to the lungs and back to the heart. The
same blood goes to the rest of the body. We have 4 rooms/chambers in
the heart.
Right atrium brings the blood from the body, which goes to the right
ventricle. Then, it goes to the pulmonary circuit and into the lungs. Then,
it goes to the left atrium and goes to the left ventricle. Next, the left
ventricle sends the blood to the body. The blood was pumped into the
capillaries, and then the capillaries leak out the blood. Then, blood from
the body goes to the right atrium. That’s the idea of the figure 8.
Atriums and the ventricles are the 2 beats our heart makes. Atriums beat
louder/harder than the ventricles.
3) A capillary bed, a vein which contains the blue blood (dioxinated) goes
into the heart and arteries take blood away from the heart. Capillary beds
surround the heart. It supplies a lot of blood and it’s coming from the
lungs.
Capillary means that the tube is so thin that pressure and force doesn’t
work so well inside it.
Veins will leak blood because there are capillaries in the veins. Blood is
under the pressure from the heart into the capillaries, but there’s no
pressure inside the capillaries. Veins have valves while the arteries don’t.
Arteries are under pressure though.
How is blood maintained? Double beats, atriums and ventricles, pressure
and no pressure.
How does the heart beat? Medulla oblongata sends the heart when we
exercise to beat faster, but not every second. The heart controls its own
beat/rhythm. A heart murmur is when a heart isn’t right and it’s
dangerous.
Node means a point. A node in the heart muscle. A sinoatrial node. Pace
maker is an electron device that can shock the heart and it helps the
beating of a murmured heart.
1) Draw the structure of the heart – septum, left and right ventricles, left
and right atrium
2) Figure 8 – map or write out the direction that blood flows:
3) Draw the capillary bed surrounding the muscle showing what’s
diffusing in (oxygen) and what’s diffusing out. Draw the capillary bed
surrounding the lungs (putting in oxygen into the capillaries)