Red blood cells are biconcave discs without a nucleus that contain hemoglobin to transport oxygen from the lungs to cells and carbon dioxide from cells back to the lungs. White blood cells change shape to surround and destroy foreign particles. Epithelium cells form protective layers that secrete mucus while muscle cells contract and relax to enable movement. Reproductive cells are sperm and ova that carry genetic material and nerve cells have long fibers that transmit impulses around the body.

1. Red blood cells
• Have no nucleus.
• Biconcave disc shaped to increase
surface area
• Contain haemoglobin that functions
to transport oxygen to all parts of the body.
• Transport carbon dioxide from cells in all parts
of the body to the lungs.
White blood cells
Change their form to surround foreign
Particles and destroys them.
Epithelium cells
Form a layer that protects organs
in the body. These cells also
secrete mucus
Muscle cells
Contract and relax muscles to
enable movement.
Reproductive cells
Sperms carry male genetic materials
and an ovum carries female genetic
materials
Nerve cells
Contains long fibers that function to carry information in
The form of impulse to all part of the body.
Example of human cells: