BLOOD CIRCULATORY SYSTEM CLASS X

Ms Sarita TejwaniKV Ujjain

Index

• 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.

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Components of circulatory system

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   Arteries  

Transport blood towards the heart Transport blood away from the heart

Carry De-oxygenated Blood(except in the case of the Pulmonary Vein)

Carry Oxygenated Blood (except in the case of the Pulmonary 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 chambersTwo lower chambers - right and left ventricles-discharging 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 Systemic circulation

Deoxygenated blood is pumped to the lungs via pulmonary artery and oxygenated blood returned to the heart via the pulmonary vein.

Systemic circulation is the circulation of the blood to all parts of the body except the lungs

RA

The cardiac cycle

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 pressureThe pressure of blood in artery

during ventricular diastole (relaxation)

80 mm of Hg

Measuring blood pressure- Sphygmomanometer

Recapitulation

Quiz blood circulation.htm

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

Thank You