Question

Red blood cells are created deep inside our bones in the _________________ . 4. Your __________________ are not visible because they are under your skin - b

Answer 1

Bone Marrow

Explanation:

Red blood cells are created deep inside our bones in the bone marrow

• Bone marrow is the soft, spongy tissue inside the bones that makes blood-forming cells (blood stem cells)
• These cells turn into blood cells including: White blood cells to fight infections,red blood cells to carry oxygen throughout the body,platelets to control bleeding

Hair root is not visible because they are under the skin

• Hair is a keratinous filament growing out of the epidermis which is primarily made of dead, keratinized cells
• Strands of hair originate in an epidermal penetration of the dermis called the hair follicle
• The part of hair which is anchored in the follicle, lies below the surface of the skin and is referred to as the hair root
• The hair root ends deep in the dermis at the hair bulb,and includes a layer of mitotically active basal cells called the hair matrix