HW and model answers of chapter 5 (p.16 to p.19)final revision grade 4

Grade 4
Continue, chapter 5
From page 16 to 19
HW of chapter 6 is page 22))

Model answers ch 5
Page 16
Q.7.MATCH:
B
A
F
E
D
C
G

Q.8.COMPLETE:
1-muscles and nerve
2-pairs
3-relaxes ,contracts
4-involuntary
5-adjust
6-Controls
7-nutrients
8-blood vessels ,intestine.
9-muscles,stomach
10-seven and 2.5 centimeters
11-large intestine
12-neurons

Q.9.GIVE REASON:
1-To use the nutrients in the food you eat.

2-Beacause there is a small wall of muscles separating the two pumps of the heart i.e. separating the two atria from the two ventricles. OR due to the existence of valves between atria and ventricles that allow movement of blood in one direction only from atria to ventricles .

3-To protect them .

4-Because in the first time of infection your body immune system has already formed antibodies against this pathogen so in the second time these antibodies will prevent the pathogen from causing the disease.



Q.10.MENTION THE ORGANS OF EACH SYSTEM:
1-Circulatory system:
Blood ,heart and blood vessels.

2-Respiratory system :
Nose ,mouth ,trachea , bronchial tube ,lungs ,diaphragm and air sacs

3-Central nervous system:
Brain and spinal cord

4-Digestive system :
Mouth ,esophagus ,stomach ,small intestine and large intestine.

Q.12.CHOOSE;
1-tissues
2-organ
3-skeletal
4-minerals
5-in pairs
6-involuntary

Q.13.COMPLETE THE LABEL

1-by order from top to down:
Cranium
Clavicle
Scapula
Sternum
Humerus
Ribs

2-from top to down:
Nose
Mouth
Trachea
lungs
Diaphragm


Page 18
Q.11.CHOOSE THE CORRECT ANSWER FROM THE LIST :
1-Your body would not be able to walk ,throw smile ,or sing without your muscular system.
2-immune system
3-organ system
4-nervous system .
5-Skeletal system
6-circulatory system
7-digestive system
8-respiratory system

Page 19
Q.12.COMPLETE:
1-spinal cord
2-three layers of connective tissue
3-blinking and pulling your hand away from hot surface
4-nerve cells
5-skull,layers of connective tissue and watery liquid
6-skin
7-bacteria and viruses
8-bacteria,virus

Best wishes