Tissues are groups of cells with a common structure and function.

Tutorial:

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• ANIMAL TISSUES
  • Epithelial cells are closely joined.

  • p. 78 Connective tissue bind and support other tissues, and contains sparsely packed cells scattered through an extracellular matrix.

  • p. 81 Muscle tissue is composed of long cells capable of contracting in response to nerve signals.

    Humans have three types of muscle tissue.

    • Skeletal muscle have striated, multinulceated fibers, and are involved in voluntary movement.
    • Cardiac muscle have intercalated discs between striated cells, and are involved in involuntary contraction of the heart.
    • Smooth muscle have unstriated, spindle-shaped cells, and are involved in involuntary contraction of internal organs other than the heart.

  • p. 82 Nervous tissue senses stimuli and transmits signals throughout the animal.

Frog skin	Compact bone	Spongy bone
Adipose tissue	Human blood	Nervous tissue
Skeletal muscle (striated, multinulceated)	Smooth muscle (unstriated, tapered)	Cardiac muscle (striated, intercalated discs)

• PLANT TISSUES
  • Meristemic tissue are regions of growth in plants.

  • Primary and secondary tissues are derived from the meristems, and comprise dermal, ground, and vascular tissues.

  Onion root	Buttercup root	Sunflower stem