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circulatory system (Heart (Structure of the heart (Divided into four…
circulatory system
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Heart
A hollow, muscular organ that pumps blood throughout the body,Pumps oxygenated blood to the body, and Pumps deoxygenated blood to the lungs
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Deoxygenated blood flows from the right atrium into the right ventricle and is pumped into the pulmonary arteries that lead to the lungs.
Oxygenated blood flows from the lungs to the left atrium of the heart
how does the heart beat
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The signal travels to another area in the heart called the atrioventricular node, causing both ventricles to contract.
The atria contract, filling the ventricles with blood.
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Pulse:The alternating expansion and relaxation of the artery wall caused by contraction of the left ventricle
Blood Pressure:A measure of how much pressure is exerted against the vessel walls by the blood
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Blood
cell
WBC
- have nucleus
- multible types
- responsible for the immune system
RBC
- they have no nucleus
thats why they live 120 days only
- look like concave
- red in color because they have a pigment called hemoglobe
contain Fe, binds to O2
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