The video explains the integumentary system, focusing on the skin's structure and functions. It covers the three main layers: epidermis, dermis, and hypodermis. The epidermis provides protection and produces vitamin D, while the dermis regulates temperature and sensation. The hypodermis stores fat and anchors the skin. The video also discusses the roles of keratin, melanin, and the skin's response to UV light.

What percentage of total body weight does the skin make up?

• 10%

• 20%

• 16%

• 25%

Which layer of the skin contains the nerves and blood vessels?

• Hypodermis

• Dermis

• Epidermis

• Stratum Basale

What is the primary function of keratin in keratinocytes?

• To detect pain

• To produce melanin

• To secrete glycolipids

• To protect cells from damage

What triggers melanocytes to produce more melanin?

• Low light conditions

• High humidity

• Sun exposure

• Cold weather

Which layer of the epidermis is responsible for the initial production of keratin precursor proteins?

• Stratum Basale

• Stratum Spinosum

• Stratum Granulosum

• Stratum Lucidum

What is the main function of dendritic cells in the stratum spinosum?

• To produce keratin

• To patrol for microbes

• To detect pressure

• To secrete glycolipids

Which layer of the dermis is responsible for fingerprints?

• Papillary layer

• Hypodermis

• Reticular layer

• Stratum corneum

What type of nerve ending in the dermis detects fine touch?

• Meissner's corpuscle

• Pacinian corpuscle

• Dendritic cells

• Free nerve endings

What is the primary function of the hypodermis?

• To produce melanin

• To regulate temperature

• To insulate deeper tissues

• To detect pain

Which cells in the hypodermis are responsible for storing fat?

• Melanocytes

• Adipocytes

• Keratinocytes

• Fibroblasts