Epithelial Tissue:

Epithelial tissue is a type of body tissue that covers on all internal and external surfaces of the body. This tissue lines body cavities and hollow organs and is the major tissue gland. Epithelial tissue has many different functions throughout the body, some of the functions are protection, absorption, and secretion.

Different types of epithelial cells based on shape include:

• Squamous epithelium: flat and sheet-like in appearance.

• Cuboidal epithelium: cube-like in appearance, they have equal width, height and depth.

• Columnar epithelium: column-like in appearance, which means that they are taller than they are wide.

Types of cell based on arrangement:

• Simple: that there’s only one layer of cells.

• Stratified: made up of more than one layer of cells.

• Pseudostratified: made up of closely packed cells that appear to be arranged in layers since they are different sizes, yet there is still only 1 layer

Epithelium: What it is, Function & Types. Cleveland Clinic. (2022). Retrieved September 25, 2022, from https://my.clevelandclinic.org/health/articles/22062-epithelium

• Support
• Protect
• Bind Organs

• Fibroblasts: relatively flat with tapered ends
• Adipocytes (Fat Cells ): small clusters, within types of connective tissue proper
  • Characteristics of Adipocytes: large clusters, cells dominant, adipose connective tissue
• Mesenchymal: stem cell, the tissue becomes damaged these will divide
• Fixed Macrophages: irregular-shaped cells, derived from a type of leukocyte
• Wandering Cells: continuously moving through connective tissue

• Tendons: structures attaching muscle to bone
• Ligaments: structures attaching bone to bone
• Adipose (Fat) Connective Tissue
• Cartilage
• Bone
• Blood

Skeletal Muscle Tissue:

Physical Description: oblong fibers are parallel and do not diverge; have more than two nuclei, feature interwoven light and dark stripes, and are controlled with the body's conscious decisions

Purpose: The skeletal muscle is responsible for moving the bones of the body and for controlling the temperature of the body when moving; When muscles are repositioning, the body warms up.

Body Site(s): Is adhered to the bones and occasionally skin, such as the muscles of the face. The outer sphincters of the anus and urethra are made of skeletal muscle tissue.

Cardiac Muscle Tissue:

Physical Description: Small cells that fan out; one or two nuclei that can found near the middle of the cell, feature interwoven light and dark stripes, amidst the cells lie intercalated discs, the body is not conscious of the movement of the cardiac muscle tissue

Purpose: The heart and blood vessels receive blood through the action of this muscle tissue.

Body Site(s): Myocardium, which is the muscle of the heart

Nervous Tissue:

Nervous tissue is found in the brain, nerves, and spinal cord. Its main function is for coordinating and controlling many body activities. Nervous tissues stimulates muscle contractions, creating an awareness of the environment, and plays an important role in emotions, memory, and reasoning. Cells in the nervous tissue need to be able to communicate with each other by way of electrical nerve impulses. Cells in the nervous tissue that generate and conduct impulses are called neurons or nerve cells. These cells have 3 parts to them: the dendrites, the cell body, and one axon. Dendrites are processes of the cytoplasm that carry impulses to the cell body. A process called an axon carries impulses away from the cell body. Nervous tissue includes cells that do not transmit impulses but instead support the activities of the neurons. These are called the glial cells. Supporting cells bind neurons together and insulate the neurons. Some are phagocytic and protect against bacterial invasion, while others provide the nutrients by binding blood vessels to the neurons.

Nervous tissue. Nervous Tissue | SEER Training. (2022). Retrieved November 6, 2022, from https://training.seer.cancer.gov/anatomy/cells_tissues_membranes/tissues/nervous.html