2. Tissues
• Cells are the body’s smallest functional units they are grouped together
to form tissues, each of which has specialized functions
• Study of tissues is called histology.
• Tissues are grouped together to form organs e.g heart,stomach ,brain.
Organs are grouped together to form system,each of which performs a
particular functions.eg digestive system
3. • Cells are closely packed without any intercellular spaces
• They lie on basement membrane
• Found covering the body and lining cavities and tubes. Outer and
inner lining of most of the body organs such as urinary tract , blood
vessels, heart chambers, uterus. Found on the entire exposed surface
of the body such as skin. Also found in glands
4. Types of tissues
• There are four types of tissues:
• Epithelial tissues
• Connective tissues
• Muscular tissues
• Nervous tissues
5. Epithelial tissues
• Epithelial tissues are widespread throughout the body. They form the covering of all
body surfaces, line body cavities and hollow organs, and are the major tissue in
glands. They perform a variety of functions that include protection, secretion,
absorption, excretion, filtration, diffusion, and sensory reception. There are five
types of epithelial tissues:
• Squamous epithelium
• Stratified squamous epithelium
• Columnar epithelium
• Cuboidal epithelium
• Ciliated columnar epithelium
6. Connective tissues
Connective tissue is the most abundant and widely distributed of the primary tissues.
Major functions of connective tissue includes binding and supporting, protecting,
transporting substances within the body. Connective tissues can have various levels of
vascularity. The four types of connective tissues are: blood, bone, cartilage, and
adipose tissue.
Bone Adipose Blood Cartilage
7. Muscle tissues
• Muscle tissue is composed of cells that have the
special ability to shorten or contract in order to produce
movement of the body parts. The tissue is highly
cellular and is well supplied with blood vessels. Muscle
tissue can be categorized into skeletal muscle tissue,
smooth muscle tissue, and cardiac muscle tissue.
• Skeletal muscle cells (fibers), like other body cells,
are soft and fragile. The connective tissue covering
furnish support and protection for the delicate cells and
allow them to withstand the forces of contraction.
• Smooth muscle is a type of tissue found in the walls
of hollow organs, such as the intestines, uterus and
stomach. ... This type of involuntary non-striated
muscle is also found in the tracts of the urinary,
respiratory and reproductive systems.
• Cardiac muscle tissue is only found in your heart,
where it performs coordinated contractions that allow
your heart to pump blood through your circulatory
system.
8. Nervous tissues
• Nervous tissue is found in the
brain, spinal cord, and nerves. It is
responsible for coordinating and
controlling many body activities.
The cells in nervous tissue that
generate and conduct impulses are
called neurons or nerve cells.
These cells have three principal
parts: the dendrites, the cell body,
and one axon.
