Which of the following is not a formed element of blood?

a. Erythrocyte

b. Leukocyte

c. Mast cell

d. Platelet

Video transcript

Hi everyone. Let's take a look at this practice problem together which formed element of the blood is responsible for hemostasis. The answer options are a erythrocytes, b, leukocytes, c thrombocytes and D plasma. For this question. Let's quickly review the composition of blood recall that blood includes two main categories. Those categories are the formed elements which are cells and cell fragments and plasma, which is the fluid matrix plasma is not a formed element. So we can eliminate option D formed elements. There are three categories of them. There's erythrocytes, leukocytes and thrombocytes. Option A E erythrocytes also known as red blood cells are cells that transport oxygen, leukocytes or white blood cells are an important part of the immune system and protect the body from infection. And thrombocytes are also known as platelets and they are important for blood clotting and blood vessel damage. So the question again is asking which of the formed elements carries out hemostasis. And what is hemostasis? Recall that hemostasis is the mechanism to stop bleeding. So then what is the answer? It's thrombocytes because thrombocytes carry out blood clotting and are important in blood vessel damage repair. So the correct answer is option. C thrombocytes. All right, everyone. I hope you found this helpful and I'll see you soon for the next practice problem.