Veins

Q. What will happen if there were no valves in the veins?

1. The flow of blood in the veins become unidirectional.
2. There will be backflow of blood.
3. Oxygenated and deoxygenated blood will mix.
4. Blood will flow under high pressure.

Q. Which of the following are characteristics of veins?

1. Carry oxygen rich blood
2. Thin walled
3. They have valves
4. Carry carbon dioxide rich blood

Q.

Veins have valves which allow blood to flow only in one direction. Arteries do not have valves. Yet the blood flows in one direction only. Can you explain why?

Q. Why are veins blue in color

Q. Which of the following blood vessel carries carbon dioxide rich blood from heart to the lungs?

1. Aorta
2. Pulmonary artery
3. Capillaries
4. Pulmonary vein

Q. Which of the following blood vessels carry blood rich in carbon dioxide?

1. Arteries
2. Veins
3. Pulmonary artery
4. Pulmonary vein

Q. What is the function of veins? Why do veins have valves? [2 MARKS]

Q.

What is lymph? Write its two important functions.

Q.

What is the role of globin protein in hemoglobin?

Q.

The blood vessel which carries blood rich in carbon dioxide is known as __.

Q.

What are the functions of lymph in the body?

Q.

Give the specific function of hydathodes and xylem.

Q.

___ carry oxygen rich blood from the heart to all parts of the body.

Q.

Do veins have thick walls?

Q.

Veins allow blood to flow only towards the ______.

Q. What pulmonary artery and vein

Q.

The blood cells which protect the body from infection are

1. RBCs

2. Platelets

3. WBCs

4. All the above

Q.

What is the role of veins?

Q.

What is lymph? How is it formed?

Q. 5ml oxygen is delivered by 100ml of blood to tissues during normal physiological conditions. Where does the rest 15ml go?

Q.

Name the type of white blood corpuscles.

Q.

Human blood is red because of

1. WBC

2. RBC

3. Platelets

4. Hemoglobin

Q. Veins have valves which allow blood to flow only in one direction. Arteries do not have valves. Yet the blood flows in one direction only. Can you explain why?

Q.

Which organ is called graveyard of RBCs?

Q. Which of the following is/are true regarding function of pulmonary arteries?

1. Pulmonary arteries help the heart to receive oxygenated blood from the lungs.
2. Pulmonary arteries help the heart to transport blood to lungs for oxygenation.
3. Pulmonary arteries are not part of the circulatory system.
4. Pulmonary arteries help the heart to pump deoxygenated blood to all parts of the body.

Q.

Veins carry oxygenated blood.

1. True
2. False

Q. Which of the following blood vessels carry blood rich in carbon dioxide?

1. Arteries
2. Veins
3. Pulmonary artery
4. Pulmonary vein

Q.

Lymph is

1. Yellow

2. Red

3. White

4. Not colored

Q.

Give scientific reasons for the following statements.
(i) Mature erythrocytes within human lack nucleus and mitochondria.
(ii) Blood flows in arteries with spurts and high pressure.

Q.

Blood flowing through arteries and veins have the same amount of dissolved oxygen.

1. False

2. True