« previous next »

Author Question: Which of the following is necessary for platelet aggregation? a. Protein S b. Kallikrein c. ... (Read 53 times)

rachel9

  • Sr. Member
  • ****
  • Posts: 495
on: Jun 25, 2018
Which of the following is necessary for platelet aggregation?
 
  a. Protein S
  b. Kallikrein
  c. Vitamin K
  d. Fibrinogen

Question 2

What happens to the fibrin monomers created when thrombin cleaves fibrinopeptides A and B from fibrinogen?
 
  a. Immediately inactivated to prevent excess clotting
  b. Converted to plasminogen
  c. Digested quickly by tissue plasminogen activator (TPA)
  d. Polymerize and are stabilized by factor XIIIa


Athena23

  • Sr. Member
  • ****
  • Posts: 305
Reply #1 on: Jun 25, 2018
Answer to Question 1

ANS: D
Platelet aggregation, the binding of platelets to one another, requires fibrinogen.

Answer to Question 2

ANS: D
Once thrombin splits fibrinopeptides A and B from fibrinogen, the fibrin monomers are formed. These spontaneously polymerize to form the initial soluble fibrin polymer, which is cross-linked by XIIIa and then becomes insoluble. Fibrin monomers spontaneously polymerize to form the fibrin clot, which is then stabilized by factor XIIIa. TPA activates plasminogen to plasmin, which lyses the clot.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.

Did you know?

Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

Did you know?

The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

Did you know?

Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

Did you know?

Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

Levels of protein structure. Levels of protein structure.
A schematic view of delivery of a protein, synthesized in cytoplasm, into the nucleus A schematic view of delivery of a protein, synthesized in cytoplasm, into the nucleus
Protein Synthesis: Translation Protein Synthesis: Translation
Action of FMRP protein in normal and fragile-X cells Action of FMRP protein in normal and fragile-X cells
Green fluorescent protein (GFP) Green fluorescent protein (GFP)
Transfer of endosymbiont genes to the nuclear genome and destinations of encoded protein products Transfer of endosymbiont genes to the nuclear genome and destinations of encoded protein products
Video: Lipid digestion - mouth, stomach and small intestine

For a complete list of videos, visit our video library