Epidermis Structure and Functions

Questions and Answers

What type of epithelium is the epidermis?

Simple squamous epithelium

Columnar epithelium

Cuboidal epithelium

Stratified epithelium (correct)

Why is the epidermis extremely thick on the palms of the hands and the soles of the feet?

To protect the underlying tissues from infection

Because these areas are highly sensitive

To increase the surface area for sensory receptors

To withstand the wear and tear that occurs in these regions (correct)

What would be the likely consequence of a thin epidermis on the palms of the hands?

Enhanced protection against UV radiation

Increased risk of infection (correct)

Faster healing of wounds

Improved sensation in the region

What is the primary function of a fixator?

To stabilize the origin of the prime mover Signup and view all the answers

What is a characteristic of the epidermis that allows it to withstand wear and tear?

Its thickness in certain regions Signup and view all the answers

What happens to the tone of a fixator when it contracts?

It increases Signup and view all the answers

Which of the following regions would most likely have a thicker epidermis?

Palm of the hand Signup and view all the answers

What type of contraction does a fixator exhibit?

Isometric Signup and view all the answers

What is the relationship between a fixator and the prime mover?

The fixator stabilizes the origin of the prime mover Signup and view all the answers

What would happen if a fixator failed to contract isometrically?

The origin of the prime mover would become unstable Signup and view all the answers

What type of cartilage are the discs or wedges composed of in certain synovial joints?

Fibrocartilage Signup and view all the answers

In which joint can articular discs typically be found?

Knee joint Signup and view all the answers

What is the primary function of articular discs in synovial joints?

To absorb shock and reduce pressure Signup and view all the answers

What is the term used to describe the structure that is interposed between the articular surfaces of the bones in certain synovial joints?

Articular disc Signup and view all the answers

What is the purpose of the articular discs in terms of joint movement?

To guide joint movement Signup and view all the answers

What is a primary characteristic of bone tissue?

It is composed of cells, fibers, and matrix Signup and view all the answers

What does bone consist of?

Cells, fibers, and matrix Signup and view all the answers

What category of tissue does bone belong to?

Connective tissue Signup and view all the answers

What is unique about bone compared to other tissues?

It is a type of connective tissue, like other tissues Signup and view all the answers

How would you describe the composition of bone?

Complex and heterogeneous Signup and view all the answers

What is a characteristic of irregular bones?

They do not fit into any specific category Signup and view all the answers

Which of the following bones is an example of an irregular bone?

Scapula Signup and view all the answers

What is a common feature of irregular bones?

They do not have a uniform shape Signup and view all the answers

Which of the following is NOT an example of an irregular bone?

Phalanges Signup and view all the answers

What is the primary function of irregular bones?

To provide support and protection Signup and view all the answers

Study Notes

Epidermis

The epidermis is a stratified epithelium.
On the palms of the hands and the soles of the feet, the epidermis is extremely thick to withstand wear and tear.

Muscle

A fixator contracts isometrically to stabilize the origin of the prime mover.
Fixator contraction increases tone but does not produce movement.

Joints

In certain synovial joints (e.g., knee joint), discs or wedges of fibrocartilage are interposed between articular surfaces of bones.
These fibrocartilage discs are referred to as articular discs.

Bones

Bone is a living tissue consisting of cells, fibers, and matrix, like other connective tissues.
Scapulae, although irregular, are classified as bones.
Irregular bones include those not assigned to previous groups, such as:
- Bones of the skull
- Vertebrae
- Pelvic bones

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Description

Learn about the epidermis, a stratified epithelium, and its adaptations in different parts of the body. Discover how it withstands wear and tear in areas like palms and soles.