Integumentary System and Fingerprints

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Questions and Answers

What type of fingerprint pattern represents the majority of the population?

Whirl

Delta

Arch

Loop (correct)

Which fingerprint pattern is characterized by no deltas?

Radical

Arch (correct)

Whirl

Loop

What is a key feature of level one fingerprint comparison?

Chemical residue detection

Classification into basic patterns (correct)

Detailed minutiae analysis

Identifying visible prints only

What can cause fingerprints to become more identifiable after recording?

Skin diseases Signup and view all the answers

Which type of print is created in a soft pliable substance and can be left behind as an impression?

Plastic print Signup and view all the answers

Which layer of skin contains blood vessels and receptor cells?

Dermis Signup and view all the answers

What main components are found in the epidermis?

Melanin and fingerprints Signup and view all the answers

How do the patterns formed by ridges and furrows in fingerprints change throughout life?

They do not normally change throughout a person's life. Signup and view all the answers

Which part of the integumentary system is considered the largest organ system in the human body?

Skin Signup and view all the answers

Which layer of skin is responsible for containing fat and larger blood vessels?

Hypodermis Signup and view all the answers

What distinguishes synthetic fibers from natural fibers?

Synthetic fibers are made from petrochemicals through polymerization. Signup and view all the answers

Which of the following is an example of a regenerated fiber?

Rayon Signup and view all the answers

Which of the following animal sources is NOT typically used for fibers?

Cotton from goats Signup and view all the answers

What happens to synthetic fibers when exposed to heat?

They melt. Signup and view all the answers

What forensic question helps determine whether fibers are natural or synthetic?

What type of weaving pattern exists? Signup and view all the answers

Which technique uses a fine powder to reveal latent fingerprints?

Dusting for prints Signup and view all the answers

What color does Ninhydrin produce when it reacts with amino acids?

Purplish blue Signup and view all the answers

What is the purpose of lifting prints with cellophane tape?

To permanently store fingerprint evidence Signup and view all the answers

Which layer of hair is responsible for providing structure?

Cortex Signup and view all the answers

What type of cross-section does Asian hair typically have?

Round Signup and view all the answers

What is the primary protein found in hair?

Keratin Signup and view all the answers

Which hair pattern is described as shingle-shaped?

Imbricate Signup and view all the answers

What is the main function of melanin in hair?

To provide color Signup and view all the answers

What type of evidence is represented by fibers?

Trace evidence Signup and view all the answers

What is the inner layer of hair called?

Medulla Signup and view all the answers

Study Notes

Fingerprints

Fingerprints are ridges and furrows on the skin.
These patterns are formed by ridges and furrows.
These patterns do not change throughout a person's lifetime, except in cases of significant skin trauma
Skin is a part of the integumentary system.
The integumentary system includes skin, hair, and nails.
Skin is the largest organ system in the human body, weighing 25 pounds.
Skin has three layers: epidermis, dermis, and hypodermis.
Epidermis is the outermost layer. Its layers include stratum corneum, which is 25 to 30 cell layers thick in palms and feet. It also contains melanin, fingerprints, palm prints, and more.
Dermis is the middle layer consisting of protein that contains hair follicles, oil glands, sweat glands and blood vessels.
Hypodermis or subcutaneous layer is the bottom layer which contains fat and connective tissues with larger blood vessels and nerves.

Fingerprint Patterns

Common fingerprint patterns: arch, loop, and whorl.
Arch patterns: make up 5% of the population, have no deltas.
Loop patterns: make up about 65% of the population, have one delta and one core.
Whorl patterns: make up 10% of the population, have two deltas.

Fingerprint Identification Methods

IAFIS (Integrated Automated Fingerprint Identification System) - a classification system that is still commonly used today for identifying fingerprints.
Henry fingerprint classification system is a system of identifying fingerprints.
Level 1, 2, and 3 classification details for matching.
Level 1: general patterns (arch, loop, whorl)
Level 2: minutiae details (ridge endings, bifurcations).
Level 3: pores, ridge shape, and details.

Fingerprint Comparison

Loops, whorls, and arches are the main features used in comparisons.
Loops have one delta and one core.
Whorls have two deltas.
Arches have no deltas.

Fingerprint Visualization

Techniques to visualize fingerprints include dusting with powders, using ninhydrin to react with amino acids, and using iodine.
Powders can be colored, magnetic, or fluorescent
Ninhydrin: reacts with amino acids to form a purplish blue image
Iodine: reacts with oils forming a brown image
Cyanoacrylate (superglue) is used in a fuming chamber to react with amino acids forming a white image.

Preserving Fingerprints

Cellophane tape is used to lift prints from surfaces to be stored.
Photocopies and digital images are taken of prints for further studies.

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Description

This quiz covers key concepts related to fingerprints and the integumentary system. You'll explore the structure of skin, its layers, and the permanence of fingerprint patterns. Test your knowledge on different types of fingerprint patterns and the functions of each skin layer.