Biology: Blood and Lymph Composition

Questions and Answers

Where does lymph originally come from?

Lymphatic vessels

Endothelial cells

Capillaries

Blood vessels (correct)

What is the composition of lymph once it gets into the lymphatic vessels?

The same as extracellular fluid (correct)

Different from extracellular fluid

Only red blood cells and proteins

Only water and glucose molecules

What percentage of blood is made up of red blood cells?

20% by volume

80% by volume

60% by volume

40% by volume (correct)

What is squeezed out of blood vessels to form lymph?

Fluid through the little holes between the capillaries Signup and view all the answers

What is lymph called before it gets into the lymphatic vessels?

Extracellular fluid Signup and view all the answers

What is the main function of proteins in blood?

To do many different kinds of things Signup and view all the answers

What is NOT represented in the drawing of blood?

Lymph Signup and view all the answers

Why is it hard to draw all the red blood cells in the blood?

Because they are packed in tightly Signup and view all the answers

What is the approximate volume of fluid that is squeezed out of the capillaries per day?

3 liters Signup and view all the answers

What is unique about the composition of lymph coming from the small intestine?

High concentration of chylomicrons Signup and view all the answers

What is the primary function of the lacteals in the small intestine?

To take up fats and chylomicrons Signup and view all the answers

What happens to the proteins produced by the liver?

They are put into lymph Signup and view all the answers

What is the approximate concentration of protein in lymph coming from the liver compared to other places?

10 times as much Signup and view all the answers

What is the eventual fate of all the lymph vessels, including the lacteals coming from the small intestine?

They merge and go back into circulation Signup and view all the answers

Where do the lymph vessels eventually merge and go to?

The heart Signup and view all the answers

Why are the veins drawn in blue in the diagram?

Because they are veins Signup and view all the answers

What is the percentage of red blood cells in lymph?

0% Signup and view all the answers

Which proteins have an easier time getting through the capillaries?

Small proteins like albumin Signup and view all the answers

Why is it important that there is less protein in lymph than in blood?

Because it affects the osmotic pressure of the blood Signup and view all the answers

What is the approximate amount of lymph produced per day?

3 liters Signup and view all the answers

Which of the following is NOT a characteristic of lymph?

It has a higher concentration of protein than blood Signup and view all the answers

What is the reason why some fluid gets taken back up into the blood vessel?

Because of the higher concentration of proteins in the blood Signup and view all the answers

What is the ratio of albumin to immunoglobulin in lymph compared to blood?

Higher in lymph Signup and view all the answers

What happens to the protein concentration as fluid gets squeezed out of the capillaries?

It decreases Signup and view all the answers

What is the primary reason why lymph has a lower concentration of protein than blood?

Because water gets out more easily than protein Signup and view all the answers

What is the function of the osmotic pressure in the blood vessel?

To pull fluid back into the blood vessel Signup and view all the answers

Study Notes

Lymph and Blood Composition

Lymph is the fluid that comes from blood vessels and is squeezed out through the little holes between capillaries
Lymph is only called lymph once it gets into the lymphatic vessels, before that it's called extracellular fluid
The composition of lymph is similar to blood plasma, minus red blood cells
Lymph has about a half to a third the amount of protein compared to blood

Blood Composition

Blood consists of about 40-45% red blood cells, 45% by volume
Blood also contains water, proteins (of varying sizes), and other substances like glucose, fats, etc.

Lymph Production

About 20 liters of lymph is squeezed out of blood vessels per day
17 liters of lymph comes back into the blood vessels, leaving a net 3 liters of lymph produced per day

Lymph Composition Variations

Lymph composition varies depending on the location in the body
In the small intestine, lymphatic vessels (lacteals) take up a lot of fats and chylomicrons, so lymph coming from there has a higher composition of fats
In the liver, lymph has a higher concentration of proteins, up to 10 times more than lymph coming from other places

Lymphatic System

Lymph vessels, including lacteals, eventually join up and come together to return to the blood circulation
The merged lymph fluids with different compositions enter the veins and go back to the heart

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Description

Explore the composition of lymph and blood, including their differences in protein content and red blood cells. Learn about the formation of lymph and its journey through the lymphatic vessels.