In this Grade 7 Life Science lesson from Chapter 19, students learn about the integumentary system, including the structure and functions of the epidermis and dermis, sweat glands, and oil glands. The lesson explains how skin protects the body by repelling water, guarding against infection, sensing the environment, and maintaining homeostasis. Students also explore how skin cells grow, how fatty tissue beneath the dermis regulates temperature, and how sweat glands cool the body through evaporation.
Section 1
Skin Protects Body Through Multiple Layers
The integumentary system shields the body through two main layers: epidermis and dermis. These layers repel water, guard against infection, maintain homeostasis, and sense the environment through specialized receptors.
Section 2
Glands Secrete Fluids to Maintain Skin Health
Sweat glands help regulate body temperature by releasing fluid that evaporates to cool the skin. Oil glands secrete moisture to keep skin flexible and partially waterproof, protecting it from drying out.
Section 3
Cells Continuously Regenerate New Skin
Skin grows from the base of the epidermis where cells divide to form new cells. Every 2-4 weeks, the entire skin surface is replaced as old cells die and are brushed off during daily activities.
Section 4
Sensory Receptors Transmit Environmental Information
The skin contains specialized receptors that sense temperature, pain, touch, and vibration. These receptors send signals to the brain, helping protect the body from potential dangers like extreme temperatures.
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Section 1
Skin Protects Body Through Multiple Layers
The integumentary system shields the body through two main layers: epidermis and dermis. These layers repel water, guard against infection, maintain homeostasis, and sense the environment through specialized receptors.
Section 2
Glands Secrete Fluids to Maintain Skin Health
Sweat glands help regulate body temperature by releasing fluid that evaporates to cool the skin. Oil glands secrete moisture to keep skin flexible and partially waterproof, protecting it from drying out.
Section 3
Cells Continuously Regenerate New Skin
Skin grows from the base of the epidermis where cells divide to form new cells. Every 2-4 weeks, the entire skin surface is replaced as old cells die and are brushed off during daily activities.
Section 4
Sensory Receptors Transmit Environmental Information
The skin contains specialized receptors that sense temperature, pain, touch, and vibration. These receptors send signals to the brain, helping protect the body from potential dangers like extreme temperatures.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter