Video Transcript
Which of the following is not a
major component of blood in humans? (A) Epithelial cells, (B) red blood
cells, (C) white blood cells, (D) plasma, or (E) platelets.
This question is asking us to
recall the major components of blood and then choose the response that is not one of
those components. So first, let’s recall that there
are four major components to human blood. We’ll briefly review them before we
select our answer.
Here we have a diagram of a blood
vessel. And we’ve exposed a view of the
lumen so that we can see the blood flowing through it. The blood vessel has an inner
lining composed of a layer of epithelial cells. The main component of our blood is
plasma, an amber-colored liquid.
Plasma transports electrolytes,
proteins, hormones, nutrients, and waste from place to place in the body. It also carries the different types
of blood cells. Red blood cells are cells that are
specifically adapted to transport oxygen. White blood cells are immune cells
that help our bodies to identify and fight off pathogens. And platelets are small cell
fragments that form blood clots in order to prevent bleeding and infection. Red blood cells, white blood cells,
platelets, and plasma are the four components that make up human blood. Epithelial cells are lining cells
and not a part of the blood itself.
Returning to our answer choices,
which of the following is not a major component of blood in humans? Well, epithelial cells are not a
component of our blood.
