Bio 110 Tissues

What is epithelial tissues function?

* Protection: Acting as a barrier against physical damage, pathogens, and harmful substances.

* Secretion: Releasing substances like hormones, enzymes, mucus, and sweat.

* Absorption: Taking in substances like nutrients and water.

* Excretion: Eliminating waste products.

* Filtration: Allowing certain substances to pass through while blocking others.

* Sensory Reception: Detecting stimuli like touch, temperature, and taste.

What tissue is this?

Simple Squamous

*One layer of flattened cells

* Located in air sacs of lungs, heart and blood vessel linings.

* Allows exchange of nutrients, gases, and wastes.

What tissue is this?

Stratified squamous

* Several layers of flattened cells.

* Located on the surface of skin, lining of mouth, esophagus, and vagina.

* Provides protection against abrasion, infection, and drying out.

What tissue is this?

Simple cuboidal

* One layer of cube-shaped cells

* Located in linings of kidney tubules and glands

* Functions in absorption and secretion

What tissue is this?

Simple columnar

* One layer of tall, slender cells

* Located in the lining of the gut and respiratory tract

* Functions in absorption and secretion

What tissue is this?

Areolar connective tissue

* Widely distributed; found under skin, around organs, between muscles

* Wraps and cushions organs

What tissue is this?

Adipose (fat) tissue

* Found under skin, around kidneys and heart.

* Functions in energy storage and insulation; cushioning for organs.

What tissue is this?

Bone:

* Found in the skeleton.

* Functions in support, protection (by enclosing organs), and movement.

What tissue is this?

Skeletal muscle:

* Long cylindrical striated cells with many nuclei

* Voluntary contraction

* Most are found attached to the skeleton

* Responsible for voluntary movement

What tissue is this?

Cardiac muscle:

* Branching striated cells, one nucleus

* Involuntary contraction

* Found in the wall of the heart

* Pumps blood through the body

What tissue is this?

Smooth muscle

* Cells tapered at each end, one nucleus.

* Involuntary contraction.

* Found in walls of hollow internal organs, such as the intestines, and tubes, such as blood vessels.

* Contractions in the digestive system move food along.

* When arranged in a circle, controls the diameter of the tube.

What tissue is this?

*Composed of neurons and nerve support cells

* Supporting cells: microglia, astrocytes, oligodendrocytes, and

schwann cells (we will cover these in the Nervous System

Unit)

-Function is to send impulses to other areas of the body

*Irritability

*Conductivity