Transcript What is the shape of a red blood cell?

Do Now:
• What are 5 things you already know about
blood?
• What are at least 3 things you already know
about the heart and the circulatory system?
Objectives for Today
• Explain the characteristics of the 4
components of blood
• Calculate the amount of each component of
blood based on their percentages
1. What is blood made of?
2. Why do our bodies need blood?
Composition of blood
• Blood transports
materials through out
the body inside blood
vessels.
Plasma
• Straw colored,
nonliving part of
blood.
• 90% Water
• Helps to regulate
body temperature
• Contains Electrolytes
• Plasma transports
blood cells, nutrient
and hormones
throughout the body.
How much blood is in the human
body?
• About 5 liters
Red Blood Cells (RBCs)
• Shaped like round
plates indented in the
center.
• Have no nucleus
https://www.youtube.co
m/watch?v=4GUYdaM3
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Quick Review Questions
• The Average adult has about __________
liters of blood?
• 5
• Describe Plasma?
• Plasma is the straw colored, non-living
part of blood. It is 90% water.
• Name 2 materials carried by plasma?
• RBC, Hormones, Digested materials.
Why is blood red?
• Blood is red because
it contains
hemoglobin and iron
rich pigment.
What does hemoglobin do
• Hemoglobin picks up
the oxygen molecules
and drops off CO2
Carbon Monoxide
• Binds to RBC better
than oxygen.
• Not good
• Kills us silently
• Cant smell it or taste
it.
Quick Review Questions
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Why is blood red?
Because it contains hemoglobin
What does hemoglobin do?
Hemoglobin carries oxygen
What is the shape of a red blood cell?
Like a plate with a dimple in the center
Why are red blood cells shaped like
that?
• To have more area for oxygen.
Anemia
• Occurs when the
blood does not have
enough hemoglobin.
• Treated by taking in
more iron
• Because iron makes
up hemoglobin
What’s wrong with this picture?
Sickle Cell Anemia
• Genetic disease
• Red blood cells
become sickle shape
• Cant carry as much
oxygen
Malaria
• Disease that attacks
the RBC.
• If you have sickle cell
you can not get the
disease.
White Blood Cells (WBCs)
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Fight infections
Large in size
Have a nucleus
Phagocyte –
surrounds and eats
the pathogen
https://www.youtube.co
m/watch?v=Z_mXDvZQ
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Platelets
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Smallest part of blood
No nucleus
Live 2-4 days
Involved in clotting of
blood
Bone marrow
• Makes the cells of the
blood
• Bone marrow is
located inside certain
long bones.
Leukemia
• Form of cancer in
which the bone
marrow makes too
many white blood
cells.
Name the parts of the blood?
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What do platelets do?
Platelets clot the blood
What is the smallest component of blood?
The platelets
What do white blood cells do?
Fight infections
How are red blood cells made?
By the bone marrow