SCIENCE EXERCISE I.3 HUMAN CIRCULATORY SYSTEM (GRADE 5)
Heart structure:
HEART
1.
The main parts of our circulatory system are _________________________________________
2.
The function of heart = __________________________________________________________
3.
The function of right ventricle = ____________________________________________________
The function of left ventricle = _____________________________________________________
4.
The heart has __________ chambers: two on top called ___________ and two on the bottom
called _________________
BLOOD
5.
The blood carries ___________, ______________, and __________ to and from all parts of body.
6.
The liquid component of blood = _____________________
7.
Function of plasma: ____________________________________________________________
8.
All cells in the blood are made in the ______________________________
9.
______________, __________________, and __________________ also make antibodies
when it needs.
10. Different kinds of blood cells and their main job:
a. red blood cells (_________________)  __________________________ to all parts of body.
b. white blood cells (_________________)  _____________ the body from _______________
c. platelets (____________________)  stop ___________________ and _________ wounds.
BLOOD VESSELS
11. Three types of blood vessels and its function:
a. ___________________________  _____________________________________________
___________________________________________________________________________
b. ___________________________  _____________________________________________
___________________________________________________________________________
c. ___________________________  _____________________________________________
___________________________________________________________________________
PULSE
12. The number of pulses in a minute is our _____________________ / _______________________
13. Some factors that affect our heart rate: _________, ________________, ___________________
ILLNESSES RELATED TO OUR CIRCULATORY SYSTEM
arteriosclerosis
stroke
anaemia
hypertension
leukaemia
heart failure
heart attack
14. Cancer of blood or cancer of bone marrow. White blood cells multiply abnormally in the bone
marrow.  _____________________________________
15. Blood flow to a part of the heart is blocked, often because of blood clot. Causes damage to the
heart muscle, which can be fatal if not treated promptly.  ______________________________
16. Heart is unable to pump blood efficiently to meet the body’s needs. Causes fatigue, shortness of
breath, and fluid build-up in the lungs, legs, or other parts of the body.  ____________________
17. Also known as high blood pressure. When the force of blood against the artery walls is consistently
too high. Can damage blood vessels and lead to heart disease, stroke, kidney problems. May be
caused by a diet high in fat or salt, being overweight, or lack of exercise. 
_______________________
18. When the amount of red blood cells in our body is low, causing lack of oxygen carried to our body.
Often caused by lack of iron in our diet or large amount of blood loss.  _____________________
19. Blood flow to brain is interrupted. Can cause brain damage, speech difficulties, other long-term
complications.  __________________________
20. Condition when arteries become narrowed and hardened due to build-up of plaq (fat, cholesterol,
etc).  _______________________________
KEEPING OUR CIRCULATORY SYSTEM HEALTHY
21. Ways to keep our circulatory system healthy:

_________________________________________________________________________
_________________________________________________________________________

_________________________________________________________________________
_________________________________________________________________________

_________________________________________________________________________
_________________________________________________________________________

_________________________________________________________________________
_________________________________________________________________________
RELATIONSHIP BETWEEN DIGESTIVE, RESPIRATORY, CIRCULATORY SYSTEM
22. What happens if digestive system does not work? What will happen to the other system?
23. What happens if respiratory system does not work? What will happen to the other system?
24. What happens if circulatory system does not work? What will happen to the other system?