Which of the following is not a type of hair?
A Lanugo
B Vellus
C Keratin
D Terminal
E All of these choices are correct.
The Correct Answer and Explanation is :
The correct answer is C. Keratin.
Explanation:
Hair is composed of a protein called keratin, but keratin itself is not a type of hair. Instead, it is a structural protein that makes up the outer layer of human skin, nails, and hair. Let’s break down the other options:
- Lanugo: This is a fine, soft hair that covers the body of a fetus or newborn. It is typically shed before or shortly after birth and is replaced by vellus hair. Lanugo plays a role in protecting the fetus’s skin and regulating its temperature in the womb.
- Vellus: This is short, thin, light-colored hair that covers most of a person’s body. Vellus hairs are often referred to as “peach fuzz” and are barely noticeable. They play a role in thermoregulation by helping to insulate the skin.
- Terminal: This type of hair is thick, long, and pigmented. Terminal hair is found on the scalp, as well as in other areas such as the eyebrows, eyelashes, and, after puberty, in areas like the armpits and pubic region. It serves various functions, including providing protection and aiding in temperature regulation.
Now, let’s talk about keratin. This protein is what hair, nails, and the outer layer of skin are made from. It acts as a protective layer, making these structures tough and resistant to damage. However, while keratin is essential for hair, it is not a type of hair itself.
In summary, lanugo, vellus, and terminal are all types of hair found at different stages of development or on different parts of the body. Keratin, on the other hand, is a key component of hair, but not a type of hair.