Integumentary System Day 1 Notes

What is the largest organ in the human body?

• Lungs

• Heart

• Liver

• Skin

Answer explanation

The largest organ in the human body is the skin. It covers the entire body and protects it from external factors such as bacteria, viruses, and injuries.

Which layer of the skin is composed of 5 layers?

• Stratum Corneum

• Stratum Basale

• Stratum Lucidum

• Stratum Granulosum

Answer explanation

The layer of the skin composed of 5 layers is the Stratum Corneum. It is the outermost layer of the epidermis.

What is the function of Langerhans cells in the epidermis?

• Produce melanin

• Sense light touch

• Produce keratin

• Ingest foreign substances and activate the immune system

Answer explanation

Langerhans cells in the epidermis ingest foreign substances and activate the immune system, making them crucial for immune defense.

Which layer of the dermis is superficial and makes up the top 1/5 of the dermis?

• Papillary layer

• Reticular layer

• Capillary layer

• Meissner's layer

Answer explanation

The superficial layer of the dermis, making up the top 1/5, is called the papillary layer. It is responsible for providing nutrients and oxygen to the epidermis.

What is the function of arrector pili muscles in the skin?

• Sense pain

• Raise hair on end

• Produce oil

• Produce sweat

Answer explanation

The function of arrector pili muscles in the skin is to raise hair on end.

What is the function of sebaceous glands in the skin?

• Sense pain

• Produce sweat

• Raise hair on end

• Produce oil

Answer explanation

Sebaceous glands in the skin produce oil, which helps to moisturize and protect the skin.

Which layer of the epidermis is found only in thick skin?

• Stratum Granulosum

• Stratum Lucidum

• Stratum Basale

• Stratum Corneum

Answer explanation

The layer of the epidermis found only in thick skin is the Stratum Lucidum. It is not present in thin skin.

What is the function of melanocytes in the skin?

• Sense light touch

• Produce sweat

• Produce melanin

• Produce oil

Answer explanation

Melanocytes in the skin produce melanin, which gives color to the skin, hair, and eyes.

What is the function of Pacinian corpuscles in the dermis?

• Ingest foreign substances and activate the immune system

• Sense light touch

• Sense pain, heat, cold, itching, and tickling

• Sense heavy touch (pressure & vibrations)

Answer explanation

Pacinian corpuscles in the dermis sense heavy touch (pressure & vibrations).

What is the function of Meissner's corpuscles in the dermis?

• Ingest foreign substances and activate the immune system

• Sense light touch

• Sense pain, heat, cold, itching, and tickling

• Sense heavy touch (pressure & vibrations)

Answer explanation

Meissner's corpuscles in the dermis function to sense light touch.