Download 6. Capillaries Worksheet

Blood and Tissue Fluid
There are three types of fluid associated
with the circulatory system:
Contents of Blood
1. Blood
2.
3.
Blood is the medium of transport for all
of the different things that our cells need
to function.
Label this diagram of the cardiovascular system, indicating what each structure
is (in squares), and what pressure each structure’s blood will be at:
How is Tissue Fluid Made?
Tissue fluid is the liquid that
allowing for transport between the blood and
cells. This transport occurs via
.
walls are partially
permeable, allowing some things to pass from
the blood to the tissue. This is a key factor in the
formation of tissue fluid.
Tissue fluid is formed due to an interplay of:
1.
2.
What is the main source of hydrostatic
pressure?
Hydrostatic pressure forces fluid out
of the capillaries, through
in their walls.
A small hydrostatic pressure in the tissue forces some fluid back into the capillaries, but
there is a net
ward movement of fluids. Outline some things that move with the fluid,
and some things that do not.
MOVES WITH FLUID
DOES NOT MOVE WITH FLUID (TOO BIG!)
Why is the blood within the capillaries
of a more negative water potential than
the fluid outside?
Water moves down the water potential
gradient and
the capillaries.
Fluid movement is a net figure calculated
by subtracting water potential effects
from hydrostatic pressure.
Hydrostatic pressure is much greater at
the
of the capillary, meaning that net fluid
movement changes along the capillary.
Fluid moving out of the
capillaries forms the tissue
fluid. Some of this is
eventually reabsorbed.
There is a net
of fluid from the arterial end
of capillaries, and a net
at the venous end.
Note that not all fluid passes
back into the capillaries.
The net excess is drained into
vessels of the
-this fluid is now known as
Lymph passes through the lymphatic system
and drains back into the
Lymph contains
(type of white blood cell) which are made in
Lymphocytes are part of the
and help to filter out foreign material from the
lymph.
CONSOLIDATION TABLE
- Complete the table to show the relative amounts of each thing within each of
the three fluid types.
Blood
Tissue Fluid
Lymph
Erythrocytes
Lymphocytes
Plasma Proteins
Oxygen
Carbon dioxide
Questions:
1. The heart of a person suffering from heart failure is very inefficient. What do you think the effects
would be on that person’s blood pressure?
2. How would low blood pressure affect the formation of tissue fluid? Explain your answer.
3. When removing breast cancer tumours, there is a risk of damaging the lymphatic drainage of in the
arm. What do you think the result of such damage would be? Explain your answer.