Why Do Humans Have Fingernails And Toenails?

The video explores the evolution and function of keratin-based structures like claws, talons, and nails. It discusses how these structures evolved from claws in early tetrapods to nails in primates, enhancing grip and sensitivity. The transition allowed primates to climb and use tools effectively. Human nails further evolved to aid in tool use, providing a firm grip and precision. Toenails protect toes from injuries and aid in balance.

What protein are claws, talons, and nails primarily made of?

• Myosin

• Elastin

• Keratin

• Collagen

Why did early primates transition from claws to nails?

• To increase their running speed

• To protect against predators

• To enhance their grip on branches

• To improve their swimming abilities

How do fingernails enhance the sensitivity of fingers?

• By providing a counterforce when touching objects

• By increasing the surface area of the skin

• By reducing the pressure on fingertips

• By thickening the skin on fingers

What role do toenails play in human balance?

• They increase the length of toes

• They provide a protective cap for toes

• They exert counter pressure on toes

• They make toes more flexible

Which of the following is NOT a function of human fingernails?

• Aiding in peeling fruits

• Protecting fingertips

• Enhancing grip

• Increasing finger length