PLTW HBS Tissue Review

What are the 4 different types of tissues in the human body?

Connective, Nervous, Muscle, and Epithelial

Where is the epithelial tissue found?

Lining of our organs and outside of the body (skin)

How is epithelial tissue classified?

By shape and number of layers

What does it mean when an epithelial tissue is classified as simple?

It has only one layer

What does it mean when an epithelial tissue is classified as stratified?

It has more than one layer

What does a squamous epithelial tissue look like?

Thin flat and smushed together

What does a cuboidal epithelial tissue look like?

Cube like

What does a columnar epithelial tissue look like?

Tall and long like a column

What does a pseudostratified epithelial tissue look like?

Appears to be stratified (layered) but is actually a single layer of cells with nuclei positioned at different levels, giving the illusion of multiple layers.

Muscle cells are responsible for what?

Movement/motion

What are the three types of muscle tissue?

Skeletal, smooth, and cardiac

What is skeletal muscle?

Moves all the bones. Found in your bones

What is smooth muscle?

Involuntary muscle movement, ex) esophagus

What is cardiac muscle?

Only found in the heart. Transmits electrical signals to keep heart contracting (has the disks)

What is the function of nervous tissue?

Send quick signals throughout the body

What is the function of connective tissue?

Living and non living cells that connect, support, and protect other tissues and organs

What are the different types of connective tissue?

Loose, dense, cartilage, fat (adipose), bone, and blood

What magnification on a microscope does bone need?

150x

What magnification on a microscope does epithelial tissue need?

175x (one on the left that looks like DNA with bands inside), 1400x (one on the right that's filled in and zoomed super close)

What magnification on a microscope does striated muscle need?

1000x

What magnification on a microscope does fat (adipose) need?

50x

What is the function of the orbicularis oculi?

To close the eyelids (area around the eyes)

What is the function of the orbicularis oris?

Facial expressions and oral functions (area around the mouth)

What is the function of the temporalis?

To elevate and retract the lower jaw, allowing chewing and other jaw movements.

What are muscle striations and what do they indicate?

The presence of striations indicates that the muscle tissue is capable of generating force through the sliding of these filaments, leading to muscle contraction and movement.

Bell's Palsy is characterized by what?

Temporary facial paralysis, It usually affects the muscle on one side of your face. It happens when there is inflammation and swelling at your 7th cranial nerve (the nerve that controls facial muscles)