ANSWERS AND STEP-BY-STEP SCIENCE
EXPLANATION
◉ Amphiarthrotic Joint Movement.
Answer: Slightly movable joint
◉ Diarthrotic Joint Movement.
Answer: Freely movable joint
◉ Thin Skin.
Answer: Covers MOST of the body; Has FOUR layers of keratinocytes
in the epidermis
◉ Thick Skin.
Answer: Truly HAIRLESS skin; Covers the palms and soles of the
feet; Has FIVE layers of keratinocytes in the epidermis
◉ Layers of Keratinocytes.
, Answer: Stratum basale, Stratum spinosum, Stratum granulosum,
Stratum lucidum, Stratum corneum
◉ Hair Growth Cycle Phases.
Answer: Anagen (active growth phase), Catagen (transition phase),
Telogen (resting phase)
◉ Three Layers of Hair.
Answer: Medulla (innermost layer), Cortex (middle layer: provides
strength, color, and texture), Cuticle (thin outer layer: protects the
cortex)
◉ Layers of Skin.
Answer: Epidermis, Dermis, Hypodermis
◉ Accessory Structure of Skin.
Answer: Arrector pili muscle
◉ Epidermis Description.
Answer: Thin outer layer. Thicker at palms and soles. Contains
keratin to make skin tough
◉ Dermis Description.