Ms Sarita Tejwani
KV Ujjain
Index
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The Circulatory System
Functions of the Circulatory System
Components of Circulatory System
The Heart
The blood vessels
Artery-Vein Comparison
Internal structure of human heart
Double circulation
The cardiac cycle
Blood pressure
Measuring blood pressure- Sphygmomanometer
References
Functions of the Circulatory System
• To carry digested food from the small intestine to all body parts.
• To carry oxygen from the lungs to the rest of the body.
• To aid in the disposal of all wastes from the body.
• To distribute heat.
• To fight diseases.
Components of
circulatory system
s
e
l
s
Heart
Blood
Blood vessels
The Heart
•Location – left side of chest cavity
•Size- As big as closed fist
•Mass-between 250 and 350 grams
The blood vessels
Artery-Vein Comparison
Veins
Transport blood towards the heart
Arteries
Transport blood away from the heart
Carry De-oxygenated Blood
Carry Oxygenated Blood
(except in the case of the Pulmonary (except in the case of the Pulmonary
Vein)
Artery)
Have relatively wide lumens
Have relatively narrow lumens
Transports blood
under lower pressure (than arteries)
Transports blood under higher
pressure (than veins)
Have valves
Do not have valves
Internal structure of human heart
1. The heart is divided into four main chambers:
The upper chambers - left and right atria -receiving
chambers
Two lower chambers - right and left ventriclesdischarging chambers.[
2. Septum-thick wall of muscle separating the right
side and the left side of the heart
3. Pericardium-double-walled protective sac
4. Valves – Tricuspid and bicuspid
5. Aorta – Main artery
6. Pulmonary artery and pulmonary vein
Double circulation
Pulmonary circulation
Deoxygenated blood is pumped
to the lungs via pulmonary
artery and oxygenated blood
returned to the heart via
the pulmonary vein.
Systemic circulation
Systemic circulation is the
circulation of the blood to all
parts of the body except the
lungs
The cardiac cycle
RA
Path of blood circulation
Blood pressure
Force that blood exert against the wall of a vessel
Systolic pressure
The pressure of blood
during ventricular
systole (contraction)
120 mm of Hg
Diastolic pressure
The pressure of blood in artery
during ventricular diastole
(relaxation)
80 mm of Hg
Measuring blood pressure- Sphygmomanometer
Recapitulation
References
•leavingbio.net
•en.wikipedia.org
•library.thinkquest.org
•https://en.wikipedia.org/wiki/Circulatory_system
•https://en.wikipedia.org/wiki/Circulatory_system
•http://biology.clc.uc.edu/courses/bio105/circulat.htm