The ppt is used in lesson Form 5 Biology Chapter 1. Transport

1. The Transport System
In Humans
Heart

2. HEART

3.  Main function is to pump blood
throughout the whole body
 The right side of the contains
deoxygenated blood while the left side
contains oxygenated blood.


4. Three types of valves
 Tricuspid valve found between the right
atrium and ventricle.
 Bicuspid valve found between the left
atrium and ventricle.
 Semi- lunar valve found between the right
ventricle and the pulmonary arch as well as
between the left ventricle and the aortic
arch.

5. Aortic arch
Pulmonary artery
Vena cava
Left atrium
Right atrium
Left ventricle
Right ventricle
Median septum

6. Blood Circulation
 Deoxygenated blood from different parts
of the body is returned to the relaxed
right atrium.
 from the upper parts of the body via the
superior vena cava.
 From the other parts of the body via the
inferior vena cava.

7.  When the right atrium contracts
 tricuspid valve opens
 deoxygenated blood enters the relaxed right
ventricle
 When the right ventricle contracts
 Tricuspid valve closes to prevent the backflow of
blood into the atrium.
 Semi-lunar valve opens
 Blood enters the pulmonary arch which later divides
into two pulmonary arteries carrying the
deoxygenated blood to the lungs

8. BLOOD FLOW

9.  The pulmonary vein carries the oxygenated
blood from the lungs to the relaxed left atrium
 When the left atrium contracts
 bicuspid valve opens
 blood enters the relaxed ventricle. The left ventricle
now contracts
 bicuspid valve closes to prevent the backflow of blood
 semi-lunar valve opens
 blood enters the aortic arch and is transported to all parts of
the body (except the lungs)

10. BLOOD VESSELS:
 There are three types of blood vessels
namely:
 artery
 vein
 capillary

11.  Arteries :
 carry oxygenated blood away from the heart
except pulmonary artery.
 Veins :
 carry deoxygenated blood towards the heart
except pulmonary veins
 Capillary:
 connects artery and vein
 allows materials in blood to be exchanged with
the surrounding tissue

12. Blood circulation
Work sheet 2
 Fill in the blanks with the suaitable answer.
 1…………………. blood from different parts of the body
is returned to the relaxed right atrium.
 2. The pulmonary vein carries the ………….. blood from
the lungs to the relaxed left atrium.
 3. Three types of blood vessels are ………………,
…………….. and …………………
 4. ………………….. carry oxygenated blood away from
the heart.

13. 5. ……………………….. carry deoxygenated blood towards
the heart.