A P 1 tissue level of organization online lecture.pptx -...

Anatomy and
Physiology
Tissue level of Organization

Anatomy and Physiology
Tissues are defines as:
 A group of cells that share the
same embryonic origin in the
stages of human development.

Anatomy and Physiology
Tissues are:
 a group of cells that all perform the
same function for the same intended
outcome.
 A group of cells that share the same
general structure and composition.

Anatomy and Physiology
 There are 4 basic types of tissues:

Epithelial tissue
 Connective tissue

Muscle tissue
 Nervous tissue

Anatomy and Physiology
 Epithelial tissue
 Location : Think of the epithelium, the outer
covering or lining of structures and organs.
 Epithelial tissue is located on the covers of the
body’s surface.
 Epithelial tissue lines the inner and outer
surfaces of hollow organs, body cavities and
glandular ducts.

Anatomy and Physiology
 Epithelial tissue

Functions:

Contains special cells that trigger the body
to respond to internal and external stimuli.
 Serves as a protective surface against
trauma and other toxins and chemicals.

Anatomy and Physiology
 Epithelial tissue

Functions:

Serves as a selective barrier for the transfer
of substances in and out of the body
 Acts as a secretory surface for the excretion
of substances out of the body.

Anatomy and Physiology
 Epithelial Tissue
 Structure: recall these cells are found on the
outer surfaces.

The outer most layer of the cell is the apical
surface.

Anatomy and Physiology
 Epithelial tissue
 The basal surface is the inner/ deepest
layer.
 The lateral surfaces make up the sides
between the cells.

Anatomy and Physiology
 Epithelial tissue
 The basement membrane is the deepest
layer that serves as a foundation for the
more superficial cells.
 The basement membrane separates two
different tissue types.

Anatomy and Physiology
 Epithelial tissue overview:
 Epithelial tissue are sheets of cells arranged
in either single or multiple layers.