Animal Tissues
There are several main types of animal tissue including : epithelial, muscle, nervous tissue and connective tissues such as bone, cartilage, blood and loose connective tissue (sometimes called areolar tissue).
Epithelial tissues are formed by cells that cover surfaces such as the surface of the skin, and line tubes and cavities, such as the digestive organs, blood vessels, kidney tubules and airways. The cells comprising an epithelial layer are linked via semi-permeable junctions; hence, this tissue provides a barrier between the external environment and the organ it covers. In addition to this protective function, epithelial tissue may also be specialized to function in secretion and absorption .
Epithelial tissue helps to protect organisms from microorganisms, injury, and fluid loss. All epithelial tissues are free surfaces attached to the underlying layers by a basement membrane.
Smooth muscle
Smooth muscle is unstriated (not striped) in appearance. The contraction of smooth muscle can be relatively slow and often happens automatically without our conscious control. Some call it involuntary muscle.
Skeletal muscle or voluntary muscle appears striped or striated when seen through a microscope. The biceps is made of skeletal muscle and when the muscle contracts it shortens bringing the lower arm upwards.
Cardiac Muscle
Cardiac muscle appears striated like skeletal muscle except in cardiac muscle there are cross bridges or cross connections linking muscle fibres together.
Explane of animal tissues and its type with example?
