I. Tissues

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¨Tissue refers to a group of similar cells with similar structures which work together to perform a specific function.

¨Simple Tissue: Cells of the same kind Eg muscle tissue, epithelial tissue, leaf epidermis

¨Complex Tissue: Cells of different kinds Eg Phloem, blood

Simple Tissues

Muscle tissue. 

Other types of muscle tissues  include the cardiac muscles where there are cross-links between muscle cells as shown in the microscope slide viewed under 100x magnification below.

Human epidermal tissue. 

Complex Tissues

Blood in a blood vessel. 

Blood is a complex tissue made up of different types of blood cells that look different and also have different functions.

Image of a blood smear when viewed under the light microscope 400x magnification.

From the image, more red blood cells are observed than white blood cells which are smaller and each white blood cell has a nucleus.