What are tissues?
Tissues are cells grouped together structurally or functionally.
What are the four basic functional types of tissues found in animals?
The four basic types of tissue are epithelial, connective, muscle, and nervous.
What functions do epithelial tissues serve?
How is epithelial tissue classified?
Epithelial tissues secret substances (acid in stomach), move substances (eggs in ovary),
absorb and transport chemicals (food in intestine), and are sensory receptors (taste buds in
tongue). They are classified according to arrangement and structure: squamous, cuboidal, and
columnar; and simple and stratified.
Describe the different types of epithelial tissues in terms of their structure, function and
There are three types of epithelial tissue: Squamous, Cuboidal, and Columnar.
Squamous are flattened and are in areas of filtration and diffusion. They can be found in the
lining of blood vessels, alveoli of lungs, and kidney structure where blood is filtered. Cuboidal
are cube-shaped and are in areas of secretion and absorption. They can be found in glands and
kidney structures where substances are absorbed and secreted. Columnar are tall and narrow
and are in areas of secretion and absorption. They often have microvilli and can be found in the
lining of the stomach and intestines.
Describe the structure and function of connective tissues and differentiate between the
different types of connective tissue.
Connective tissue are cells embedded in matrix that they secrete. The matrix differs
among connective tissue types. Matrix includes protein fibers: collagen (structural support
protein) and elastin (stretchable protein). There are 6 types of connective tissue: loose, dense,
adipose, blood, cartilage, and bone. Loose are between organs. Dense are in tendons and
ligaments. Adipose store droplets of lipids and are for fuel reserve, cushioning of organs, and
insulation. Blood are cells (red and white blood cells, platelets) and plasma (fluid portion with
proteins, water, and hormones). Cartialge are protein (collagen) embedded in other proteins
and carbohydrates. They are in your ears, nose, trachea, and cartilaginous animals. Bone are
calcified tissue and are in the skeleton of vertebrates.
Describe the structure and function of muscle tissue.
What are three types of muscle
tissue and where is each found?
Muscle tissue are elongated muscle cells that contain protein filaments. Filaments slide
past one another- contract and cause movement. They are the most abundant tissues in the
body and use the most energy. The three types are skeletal, smooth, and cardiac.
Describe the structure and function of nervous tissue.
Nervous tissue consist of nerve cells- neurons and supporting cells. They carry nerve
impulses in the form of electrical current. They communicate with other nervous tissue,
muscles, organs, and glands.
What are organs?