Bleeding

Q.

What is diapedesis?

Q.

Write the main steps in the coagulation of blood in their correct sequence?

Q.

What would happen if the circulatory system stopped working?

Q. Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds?

Q.

The vitamin which is generally excreted in urine by humans is _____________.

Q. State the reason for the high hydrostatic pressure in the glomerulus

Q.

Blood vessels that carry blood from organs to the heart are called____.

Q.

Name the largest: a) artery b) vein in our body.

Q.

Arteries and veins are joined by a network of _________.

Q.

Why do veins have thin walls as compared to the arteries?

Q.

What percentage of blood are platelets?

Q.

The aorta is the largest artery in the body.

1. True

2. False

Q.

What is the colour of deoxgenatd blood of human body

Q. Choose the correct statement that describes arteries.

1. They have thick elastic walls, blood flows under high pressure; collect blood from different organs and bring it back to the heart.
   
2. They have thin walls with valves inside, blood flows under low pressure and carry blood away from the heart to various organs of the body.
   
3. They have thick elastic walls, blood flows under low pressure; carry blood from the heart to various organs of the body.
   
4. They have thick elastic walls without valves inside, blood flows under high pressure and carry blood away from the heart to different parts of the body.

Q.

What is the smallest vein?

Q.

Carbon dioxide is transported in the blood by:

1. Plasma

2. Platelets

3. Leucocytes

4. Thrombocytes

Q.

MODELING REAL LIFE
Platelets are cell-like particles in the blood that help form blood clots.

a. How many platelets are in 3 milliliters of blood? Write your answer in standard form.
b. An adult human body contains about 5 liters of blood. How many platelets are in an adult human body?

Q.

What is the role of platelets in the blood?

1. It helps in transport of oxygen.

2. It helps in transport of food.

3. It helps in clotting of blood flow.

4. It helps to reduce the toxins in blood plasma.

Q.

Coagulation of blood in a cut or wound is brought about by :
(a) plasma
(b) platelets
(c) WBC
(d) RBC

Q.

Is it possible for the blood to clot under the skin? Give a reason to support your answer.

Q. Diffeentiate between double circulation and single circulation of blood with examples.
( FIVE MARKS )

Q.

Do arteries carry blood to the heart?

Q.

How are new blood vessels formed?

Q. Differentiate between veins and arteries.

Q. Which of the following structures would be expected to contain oxygen-rich blood?
I. Pulmonary artery
II. Pulmonary vein
Ill. Superior vena cava

1. I only
2. II only
3. III only
4. I and II only
5. I, II, and III only

Q.

What are capillaries?

Q.

Question 68
What will happen if platelets were absent in the blood?

Q. What are the three main types of blood vessels in the body?

Q. Which of the following organ systems transports materials such as nutrients, oxygen and hormones to body cells and transports carbon dioxide and various waste products away from cells?

1. Circulatory system
2. Endocrine system
3. Respiratory system
4. Digestive system
5. Nervous system

Q. Differentiate between arteries and veins