Human Body Systems Unit Test

The outer layer of skin is called the ______.

• dermis

• epidermis

• keratin

• barrier

The skin's main function is to act as a barrier.

• True

• False

What is the second layer of skin called?

• dermis

• epidermis

• keratin

• barrier

The main function of the sweat glands in the skin is to help warm the body by producing sweat.

• True

• False

This part of the blood protects and repairs the skin by helping the blood to clot and form scabs.

• white blood cells

• red blood cells

• platelets

• plasma

What is the substance that gives skin its color?

• keratin

• tanning

• melanin

• freckles

The skeleton is a ______ of bones that supports your body and gives it a shape.

• framework

• collection

• network

• pile

A baby is born with 300 bones but an adult has 206 bones after fusion during growth.

• True

• False

Bones are ______, ______ tissues that contain nerves and blood vessels.

• living, growing

• dead, static

• non-living, shrinking

• inert, decaying

What is the hardest type of bone?

• cement

• ceramic

• compact

• clay