Circulatory System and Circulation

Q uestion one: Complete the following:

1- The circulatory system consists of ………, ………and ……… .

heart – blood vessels – blood  

2 - The heart consists of ……… chambers.

four  

3 - The heart consists of ……… sides.

two  

4 - The heart is a ……… muscular organ.

hollow  

5 - The upper room of heart is called ……… while the lower room is called ……… .

atrium – ventricle

6 - The ……… separates atrium from ventricle.

valve

7 - The heart pumps ……… to all body parts.

blood

8 - The heart pulses are called ……… .

heart beats

9 - The blood vessels are divided into ………, ……… and ……… .

arteries – veins – blood capillaries  

1 0- The artery transfers blood from ……… to ……… .

heart – body parts

1 1- The vein transfers blood from ……… to ……… .

body parts –  heart  

1 2- The blood capillaries spread in all ……… and ……… .

body cells – tissues

1 3- The blood capillaries join between ends of ……… and ……… .

arteries – veins

1 4- Blood consists of ………, ……… , ……… and ……… .

red blood cells – white blood cells – platelets – plasma

1 5- The blood is ……… liquid that transfers ……… and ……… to all body parts.

red – oxygen – digested food  

Q uestion two: Write one function for:

1- Heart

Pumping  blood to all body parts.

2 - Valve

Making blood move from atrium to ventricle only.  

3 - Blood platelets

Helping forming blood clot.

4 - Plasma

Transferring  digested food.  

5 - Red blood cells

Carrying oxygen for cells and get carbon dioxide out.  

6 - White blood cells

Attacking  microbes.  

7 - Arteries

Transferring  blood from heart to body parts.

8 - Vein

Transferring blood from body parts to heart  

9 - Blood capillaries

Transferring food and oxygen to all body cells and tissues.

Q uestion three: Give reasons for:

1- Heart acts as a pump.

Because it pushes blood to all body parts.  

2 - There is a valve between atrium and ventricle.

To make blood move in one direction (from atrium to ventricle).  

3 - Blood has many functions.

Because it transfers and delivers materials from cells to all body parts also defence and protection of body.  

4 - Ventricles have thicker walls.

Because it pushes the blood for distance more than atrium.

5 - We should avoid smoking.

Because it harms the circulatory system.

Q uestion four: Compare between:

1- Atrium and ventricle:

Atrium	Ventricle
Upper part of heart         Thin walls	Lower part of heart          Thicker walls

2 - Red blood cells and white blood cells:

RCB'S	WBC'S
Carry oxygen and carbon dioxide          Don’t have nuclei	Attack microbes            Have nuclei

3 - Artery and vein:

Artery	Vein
-         Carries blood from heart to body parts	-         Carries blood from body parts to heart

4 - Minor blood circulation and major blood circulation:

Minor	Major
Between heart and lungs	Between heart and body parts

5 - Plasma and blood platelets:

Plasma	Platelets
Yellow color cells carry digested food	Help stopping bleeding and make blood clots

Q uestion five: What happens if?

1- There is no valve in heart.

Blood will be mixed between ventricle and atrium.  

2 - No platelets in blood.

Wounds will bleed to death.

3 - Heart stops working.

Human will die.  

4 - No white blood cells in blood.

Microbes will attack body.