Red Blood cells
What is the main job of red blood cells?
To carry oxygen throughout the body.
What is the main function of white blood cells?
To protect the body from infection and disease.
What percentage of blood is plasma?
About 55%.
Name one main function of blood.
Transportation, regulation, or protection.
Why shouldn’t we be afraid of blood?
Because it keeps us alive and protects us.
What protein inside RBCs binds to oxygen?
Hemoglobin.
What are the two main groups of white blood cells?
Granulocytes and Agranulocytes.
What is plasma mostly made of?
Water (about 90%).
What does blood transport throughout the body?
Oxygen, nutrients, hormones, and waste.
What does blood do when we get a cut?
It clots to stop bleeding and heal the wound.
Why are red blood cells shaped like biconcave discs?
To increase surface area and flexibility for easier movement through capillaries.
Name one granulocyte and its function.
Neutrophils: eat bacteria
Eosinophils: fight parasites.
Basophils: release histamine.
Name two substances plasma carries.
Nutrients, hormones, waste, or proteins.
How does blood help regulate the body?
By controlling temperature, pH, and fluid balance.
What do white blood cells do when we’re sick?
They fight germs and infections.
Why don’t red blood cells have a nucleus?
To make more space for hemoglobin and oxygen transport.
Name one agranulocyte and its function.
Lymphocytes: produce antibodies.
Monocytes: clean up dead cells.
What are platelets and what do they do?
Small cell fragments that help clot blood.
What part of blood helps protect the body by clotting?
Platelets.
What makes blood amazing instead of scary?
It delivers oxygen, heals, and fights off disease.
How long do red blood cells live before being recycled?
About 120 days.
How do WBCs move through vessel walls to reach infected tissues?
By a process called diapedesis (squeezing through capillary walls).
What large cells do platelets come from?
Megakaryocytes.
How do white blood cells protect the body?
By attacking bacteria, viruses, and foreign invaders.
What does “blood is life” mean?
Blood supports every function of the body — it’s essential for survival.