Fill in the blanks.

1. The heart is divided into ______________ (two/four) chambers.
2. The throbbing feeling of the artery near the wrist is called ____________ (pulse/heartbeat)
3. Blood is a special kind of fluid that flows in the tabular structure called ___________ (blood-vessels/pipes).
4. The red colour of blood is due to the presence of a pigment called ____________ (haemoglobin/chlorophyll).
5. ____________ (WBCs/platelets) help in clotting of blood to prevent blood loss.

State True or False.

1. The blood circulates throughout the body through a network of tubes called the blood vessels.
2. The blood vessels that carry blood away from the heart to different parts of the body are called veins.
3. The smallest blood vessels are called capillaries.
4. Superior vena cava brings blood from those organs of the body that lie above the heart.
5. Arteries branch out into smaller network of blood vessels called arterioles.

Tick (√) the correct answer.

1. The transporation of substances in our body is carried out by this organ system.
   1. Circulatory system
   2. Respiratory system
   3. Digestive system
   4. None of these
2. The two upper chambers of the heart are called _____________.
   1. ventricles
   2. aorta
   3. atria
   4. capillaries
3. Which of the following is not a part of circulatory system?
   1. Heart
   2. Blood vessels
   3. Blood
   4. Kidneys
4. Blood flows in the tubular structures called _____________.
   1. blood vessels
   2. atria
   3. ventricles
   4. None of these
5. These helps in blood clotting.
   1. WBCs
   2. Platelets
   3. RBCs
   4. None of these
6. These build immune system of our body.
   1. RBCs
   2. WBCs
   3. Platelets
   4. All of these
7. The normal human pulse rate is _______________ beats per minute.
   1. 60 to 65
   2. 95 to 100
   3. 60 to 100
   4. 40 to 100

State True or False. Correct the false statement.

1. Blood does not remove waste from the body.
2. Superior vena cava brings blood from those organs of the body that lie below the heart.
3. The smallest blood vessles are called aorta.
4. Blood vessels are of two types only - arteries and veins.
5. The red blood cells help in building immune system of the body.
6. Arteries carry oxygen-rich blood from heart to different parts of the body.

Guess, who am I?

1. The part of the circulatory system that carries essential nutrients and oxygen to different organs. It also plays a vital role in removing waste products from these organs.
2. The throbbing feeling of the artery near the wrist.
3. The pigment present in blood that gives it the red colour.
4. The smaller blood vessels that branch out from arteries.
5. The vein that brings blood from those organs of the body that lie above the heart.
6. The blood vessels that carry blood away from the heart to different parts of the body.
7. The smallest blood vessel.