Circulation of Blood

Transportation

Our body is like a map on a big road. In that there are many small, big roads or transports. These takes you towards the important parts of your body. Leads us towards important places.

Human Circulatory system has 3 main parts.

• Blood Vessels – Kind of tubes through which blood flows.• Heart – To purify blood and pump it into body.• Blood– Transportation of Food constituents, oxygen and waste

material

Arteries

• Vessels which carry blood from heart to the different parts of the body.

• They have smaller diameter.• yaamaQyao JaDpaa nasataata.• Blood pressure is approximately 100 m Hg

Blood vessels

• Through skin like tunnel the network of the vessels is spread all over the body.

Veins

• Vessels which carry blood from all parts of the body towards heart.• Diameter is more.• yaamaQyao JaDpaa Asataata.• Blood pressure is approximately 2mm Hg.

Capillaries

• These are very fine blood vessels with thin wall .

• They join arteries and veins.• Their network is spread all over the body.

• Function: They facilitate the exchange of substances , oxygen and carbon dioxide

between them and cells.

Heart

• Heart is divided into 4 parts.

• Upper part: Right artria Left artria

• Lower Part : Right ventricleLeft ventricle

Lab Heart sounds are the noises generated by the

beating heart.Lab- When the blood in the heart is pushed in the body.

Dab – When the blood from the body is pumped into heart

Dab

Blood circulation in humans

Deoxygenated blood enters the right atria and from there it enters the right ventricle. Afterwards it is passed on to the lungs through lungs artery for purification. After that it moves back to left atria and then to the left ventricle. From there the oxygen rich blood is circulated to all the parts of the body.

• Heart beats are measured using stethoscope.

Average Heart Rate of some Mammals

28

200

50 30 9

7040

376

050

100150200250300350400

camel cat cow elephant greywhale

human lion mouse

Mammals

Hea

rtb

eats

per

min

ute

Heart Facts• Hold out your hand and make a fist. If you're a kid, your

heart is about the same size as your fist, and if you're an adult, it's about the same size as two fists.

• Your heart beats about 100,000 times in one day and about 35 million times in a year. During an average lifetime, the human heart will beat more than 2.5 billion times.

• Give a tennis ball a good, hard squeeze. You're using about the same amount of force your heart uses to pump blood out to the body. Even at rest, the muscles of the heart work hard--twice as hard as the leg muscles of a person sprinting.

What are the blood constituents?

• Plasma:

- The liquid part of the blood contains 90 % water, 7 % protiens and 3 % iron.

•Blood cells– They carry oxygen to all parts

of the body

• White blood corpuscles

• protects our body from attack of bacterias

Platelets:

– Creates blood clots– Helps in

freezing/clotting bleeding blood.

Blood groups

There are 4 types of blood groups in humans

A blood group

B blood group

AB blood group

O blood group