Question

Which of the following is/are true of platelets?

• A. Platelets are sometimes referred to as thrombocytes.

• B. Platelets are actually pieces of large cells called a megakaryocytes.

• C. Platelets are very small, but very numerous, sometimes numbering 150,000 to 160,000 per microliter of blood.

• D. Platelets are critical to hemostasis, the stoppage of blood flow following damage to a vessel.

• E. All of the above are true.

Answer 1

Answer is E all pf the above are true.

Platelets are also referred to as thrombocytes which are derivatives of megakaryocytes, or are thrie fragments.

They lack nucleus and has cytoplasm only.

Platelets are small in size but in a normal person their average range is 1,50,000 to 4,50,000. Platelets count beyond 1.5 lacs causes thrombocytopenia, when it is more then 4.5 lacs it causes thrombocytosis.

Platelets have two main function in the body - coagulation of blood and inflammation.

During bleeding from injury site, they are aggregated and form a blood clot which prevents bleeding and maintain blood homeostasis.

During any external foreign body encounter or external injury, it initiates inflammatory rections and along with leukocytes bring inflammatory changes.