Blood: 12.4 Questions

Question 1

What is the normal platelet count in the adult?

Answer 1

130,000 – 400,000/uL

Question 2

What formed element is responsible for sealing broken blood vessels and sending “messages of help” in large breaks in blood vessels?

Answer 2

Thrombocytes

Question 3

Location:
Where would one normally find platelets?

Answer 3

In the bloodstream.

Question 4

Do platelets have a nucleus?

Answer 4

No. They are fragments of a cell.

Question 5

Which is the smallest – a rbc, a wbc or a platelet?

Answer 5

platelet

Question 6

Platelets secrete vasoconstrictors that cause constriction of ____________.

Answer 6

Blood vessels

Question 7

Platelets can stick together and form _____________ to seal small breaks in injured blood vessels.

Answer 7

Platelet plugs

Question 8

Platelets are fragments from what cell?

Answer 8

Megakaryocytes

Question 9

Hemostasis has three stages. The first stage is ________________ which is constriction within the damaged blood vessel.

Answer 9

Vascular spasm

Question 10

Hemostasis has three stages. The second stage is _____________ which is when platelets stick together to act as a stopper in the blood vessels.

Answer 10

Platelet plug

Question 11

Hemostasis has three stages. The third stage is _____________ which is a complex chain of events that involves many clotting factors. The end goal is to convert fibrinogen to fibrin.

Answer 11

coagulation

Question 12

What does fibrin do in the coagulation process?

Answer 12

Forms a sticky net to trap rbcs, wbcs, and platelets to form a clot that allows repair work to fix the damage.

Question 13

What is the purpose of vascular spasm?

Answer 13

Narrows the opening of the blood vessel that is damaged to reduce blood loss.

Question 14

What is the purpose of platelet plugs?

Answer 14

To reduce or stop minor bleeding.

Question 15

Clotting factors, calcium, prothrombin, thrombin and fibrinogen are all part of the _________________________ process.

Answer 15

Coagulation

Question 16

The absence of clotting factor VIII is the most common cause of:

Answer 16

Hemophilia

Question 17

What two types of anticoagulants are used to prevent blood clots from forming?

Answer 17

• Coumadin (warfarin)
• Heparin (only given in hospitals)

Question 18

What plasma protein is used in coagulation?

Answer 18

Fibrinogen

Question 19

Calcium is needed for coagulation (blood clotting). TRUE or FALSE?

Answer 19

True. Thus we have learned four important uses for calcium:
• Used for moving the synaptic vesicle in
neuron transmission
• Used to move the tropomyosin off the
troponin in muscle contraction
• Used to build strong bones and teeth
• Used for blood clotting

Question 20

Most heart attacks and strokes are due to:

Answer 20

Thrombosis

Question 21

An abnormal blood clot that develops and remains in an unbroken blood vessel is called a:

Answer 21

Thrombus

Question 22

A piece of a clot that has broken off and traveled in the bloodstream then blocks a different blood vessel is called an:

Answer 22

Embolus

Question 23

Fibrinogen is converted to fibrin, which forms sticky, web-like threads. What does the “web” trap?

Answer 23

RBCs, WBCs and platelets

Question 24

The purpose of ________________ is to form a clot that allows repair work to fix the damage.

Answer 24

Coagulation

Question 25

Where are most of the clotting factors produced?

Answer 25

The liver

Question 26

Increased bleeding and bruising may be an indicator of liver disease. This is due to many of the ___________ factors and fibrinogen being produced by the liver.

Answer 26

Clotting